ChatGPT answers, unedited

For an agency managing many client ad accounts, the standard tools are:

• Google Ads Manager Account (MCC) — centralizes multiple client accounts and lets you assign different user access levels. Google Help Google Help
• Meta Business Manager / Business Suite — manages client ad-account access through partner roles and permissions.
• LinkedIn Business Manager — provides centralized people and ad-account permissions. LinkedIn Business Solutions

If you mean one tool that manages permissions across Google, Meta, LinkedIn, etc., that's a different category of agency-access/identity-management platform.

For an agency managing many client ad accounts, the usual tools are agency management platforms or the native business manager/admin tools from the ad platforms.

Common options:

• Meta Business Manager — Used by agencies to manage multiple Meta (Facebook/Instagram) ad accounts, assign people, set roles (admin, advertiser, analyst, etc.), and control access to specific client assets. LinkedIn Business Solutions
• Google Ads Manager Account (MCC) — Lets agencies manage multiple Google Ads client accounts from one login, with user access controls and account-level permissions.
• AgencyAnalytics — Useful when the goal is giving clients and internal staff controlled access to dashboards, reports, and connected marketing data. AgencyAnalytics
• NinjaCat — Provides agency user roles and lets agencies control which client accounts different users can access. NinjaCat Docs
• AgencyAccess — Focuses on collecting and managing client permissions/access during onboarding across ad and analytics platforms. AgencyAccess
• Leadsie — Helps agencies request and manage client access without sharing passwords. Leadsie

If you mean “one central tool where an agency owner can add employees, clients, roles, and permissions across hundreds of ad accounts”, look for an agency operations platform with RBAC (role-based access control). Examples include tools like AgencyAnalytics, NinjaCat, or specialized ad-management platforms. AgencyAnalytics NinjaCat Docs

If you mean specifically Meta ads, Google Ads, TikTok ads, or all platforms together, the best answer changes.

For an agency managing many client ad accounts, the tool you’re looking for is usually an agency management platform with role-based access control (RBAC) or the ad platforms’ own manager accounts/business managers.

Common options:

• Google Ads Manager Account (formerly MCC) — lets agencies manage multiple Google Ads accounts from one dashboard and assign users with different access levels. Good for controlling who can manage which client accounts.
• Meta Business Manager — lets agencies manage multiple ad accounts, Pages, pixels, and other assets with roles such as admin, employee, and partner access. LinkedIn
• Microsoft Advertising Manager Accounts — supports agency account hierarchies and user roles across multiple advertiser accounts. Microsoft Learn
• AgencyAnalytics — useful when the goal is giving staff and clients controlled access to dashboards, reports, and connected marketing data rather than directly managing ad platforms. It supports staff/client users and granular permissions. AgencyAnalytics AgencyAnalytics Knowledge Base
• AgencyAccess — focused on collecting and organizing client access requests across platforms, using guided onboarding flows instead of exchanging passwords. AgencyAccess

If you mean “one place where an agency owner can add employees, assign them only certain client ad accounts, and control permissions at scale,” look for:

• agency/team management
• RBAC (role-based access control)
• client/account-level permissions
• audit logs
• partner access management

For running campaigns, use the ad platforms’ manager tools (Google Ads Manager, Meta Business Manager, etc.). For organizing people and permissions across many platforms, an agency operations platform may fit better. AgencyAnalytics AgencyAnalytics Knowledge Base

If you mean Meta/Facebook ad accounts, the tool is Meta Business Manager (now Business Portfolio/Meta Business Suite). It lets an agency:

• Manage many client ad accounts from one agency business.
• Add employees and assign roles/permissions.
• Get partner access to client-owned ad accounts without taking ownership.
• Control access at the individual ad-account/asset level. Blip Stackmatix

If you mean Google Ads, the equivalent is a Google Ads Manager Account (MCC). You link multiple client accounts under the manager account, and users' roles can be inherited across the account hierarchy. Google for Developers

In short:
Meta → Business Manager/Business Portfolio
Google Ads → Manager Account (MCC)

If you're looking for a third-party agency tool that manages permissions across Meta + Google + TikTok/etc. from one dashboard, I can name the best options.

If you mean an agency managing many clients’ ad accounts, the right tool depends on the ad platform:

• Google Ads: Google Ads Manager Account (MCC) — built specifically for agencies to manage multiple client accounts from one dashboard. It supports user access levels such as Administrative, Standard, Read-only, Billing, and Email-only. Google Help Google
• Meta/Facebook Ads: Meta Business Manager / Business Portfolio — lets agencies manage multiple ad accounts, assign people, partners, and granular permissions. Blip
• LinkedIn Ads: LinkedIn Business Manager — centralizes people and permissions across multiple ad accounts and Pages, with business-level and account-level roles. LinkedIn
• Pinterest Ads: Pinterest Business Manager — provides centralized access, employee/partner management, and permissions across multiple ad accounts. Pinterest Help

If you're specifically talking about Google Ads, the answer is Google Ads Manager Account (MCC). That's the standard agency setup for client access, users, roles, and permissions across many accounts. Google Help

business.google.com

If you mean Google Ads, the tool an agency should use is a Google Ads Manager Account (MCC).

It’s designed specifically for agencies managing many client ad accounts from one place. You can:

• Link and manage multiple client Google Ads accounts under one hierarchy. Google Help Google Help
• Give agency employees different access levels to the manager account.
• Manage users and change their access levels through Access and security. Google Help
• Use sub-manager accounts to divide clients among teams while keeping an overall agency hierarchy. Google Help
• Manage client-account permissions when your manager account has the necessary ownership/access. Google Help

In short:
Agency → Google Ads Manager Account (MCC) → Client Ad Accounts → Users/roles

support.google.com

If you're asking about Meta/Facebook ad accounts instead, the equivalent is Meta Business Manager/Business Portfolio, which has a somewhat different permissions model.

If you're referring to Meta (Facebook and Instagram) advertising, the tool is Meta Business Manager (now commonly called Meta Business Portfolio within Meta Business Suite).

It allows agencies to:

• Manage multiple client ad accounts from one place.
• Assign user roles and permissions (Admin, Advertiser, Analyst, etc.) to employees and contractors.
• Grant or request partner access to client assets without transferring ownership.
• Organize people, Pages, ad accounts, Pixels, catalogs, and other business assets centrally. Social Media Examiner Delvia Content Hub

For Google Ads, the equivalent is a Google Ads Manager Account (MCC), which lets agencies manage multiple client Google Ads accounts from a single login while controlling user access and permissions. Web Tonic AliasMode

So if this is a certification or exam question that asks:

"Which tool can an agency use to set up client access, user roles, and permissions for many ad accounts?"

the expected answer is:

✅ Meta Business Manager (Meta Business Portfolio)

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing many client advertising accounts, the standard tools depend on the advertising platform:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets your agency manage multiple client accounts from one login, assign different user roles (Admin, Standard, Read-only, Billing, etc.), and control access across the account hierarchy. Google Help Google Help
• Meta (Facebook/Instagram): Use Meta Business Portfolio (formerly Business Manager). Clients grant your agency partner access, and you can assign team members different permissions (e.g., admin, advertiser, analyst) for ad accounts, Pages, Pixels, and other assets. Web Tonic

If your question is about streamlining client onboarding—instead of manually requesting access for each platform—agencies often use specialized tools such as:

• AgencyAccess – sends clients a single branded link to grant access across Google Ads, Meta, GA4, Search Console, Shopify, LinkedIn, and more. AgencyAccess
• Similar onboarding tools include Leadsie and ClientInvite, which simplify permission requests across multiple platforms. ClientInvite Reddit

So:

• To manage users, roles, and permissions within ad platforms: Google Ads Manager (MCC) and Meta Business Portfolio are the official solutions.
• To make onboarding dozens or hundreds of clients easier: consider an agency onboarding platform like AgencyAccess or Leadsie.

If you're managing advertising for many clients, the standard tools are the platform-native business management systems:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets an agency:

• Manage hundreds or thousands of client Google Ads accounts from one login.
• Assign users different permission levels (Administrative, Standard, Read only, Billing, etc.).
• Grant access without sharing passwords.
• Organize accounts into hierarchies and sub-manager accounts for teams. Google Support Google Support
• Meta (Facebook & Instagram): Use Meta Business Manager / Business Portfolio. It allows you to:

• Request partner access to client ad accounts.
• Assign team members roles such as Admin, Advertiser, or Analyst.
• Control permissions for ad accounts, Pages, Pixels, and other assets.
• Remove access centrally when staff or contractors leave. Facebook

For agencies managing many clients, the recommended practice is:

• The client owns the advertising account.
• The agency receives partner access rather than owning the client's assets.
• Individual agency employees are assigned only the permissions they need (least-privilege access). This makes onboarding, offboarding, and security much easier. Google Support Stackmatix

If you're looking for a tool that manages multiple advertising platforms (Google, Meta, LinkedIn, TikTok, etc.) with centralized user management, there are agency platforms like:

• Marin Software
• Skai
• Smartly.io

These don't replace Google Ads Manager or Meta Business Manager—they sit on top of them to streamline campaign management and reporting across many client accounts.

If your goal is client onboarding and access management (rather than campaign management), I can also recommend tools specifically designed to automate requesting and granting permissions.

If you're managing advertising for many clients, the standard tools are the platform-native business management systems:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets an agency:

• Manage hundreds or thousands of client Google Ads accounts from one login.
• Assign users different permission levels (Administrative, Standard, Read only, Billing, etc.).
• Grant access without sharing passwords.
• Organize accounts into hierarchies and sub-manager accounts for teams. Google Support Google Support
• Meta (Facebook & Instagram): Use Meta Business Manager / Business Portfolio. It allows you to:

• Request partner access to client ad accounts.
• Assign team members roles such as Admin, Advertiser, or Analyst.
• Control permissions for ad accounts, Pages, Pixels, and other assets.
• Remove access centrally when staff or contractors leave. Facebook

For agencies managing many clients, the recommended practice is:

• The client owns the advertising account.
• The agency receives partner access rather than owning the client's assets.
• Individual agency employees are assigned only the permissions they need (least-privilege access). This makes onboarding, offboarding, and security much easier. Google Support Stackmatix

If you're looking for a tool that manages multiple advertising platforms (Google, Meta, LinkedIn, TikTok, etc.) with centralized user management, there are agency platforms like:

• Marin Software
• Skai
• Smartly.io

These don't replace Google Ads Manager or Meta Business Manager—they sit on top of them to streamline campaign management and reporting across many client accounts.

If your goal is client onboarding and access management (rather than campaign management), I can also recommend tools specifically designed to automate requesting and granting permissions.

If you're managing advertising for many clients, the standard tools are the platform-native business management systems:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets an agency:
  • Manage hundreds or thousands of client Google Ads accounts from one login.
  • Assign users different permission levels (Administrative, Standard, Read only, Billing, etc.).
  • Grant access without sharing passwords.
  • Organize accounts into hierarchies and sub-manager accounts for teams. support.google.com

• Meta (Facebook & Instagram): Use Meta Business Manager / Business Portfolio. It allows you to:
  • Request partner access to client ad accounts.
  • Assign team members roles such as Admin, Advertiser, or Analyst.
  • Control permissions for ad accounts, Pages, Pixels, and other assets.
  • Remove access centrally when staff or contractors leave. www.facebook.com

For agencies managing many clients, the recommended practice is:

• The client owns the advertising account.
• The agency receives partner access rather than owning the client's assets.
• Individual agency employees are assigned only the permissions they need (least-privilege access). This makes onboarding, offboarding, and security much easier. support.google.com

If you're looking for a tool that manages multiple advertising platforms (Google, Meta, LinkedIn, TikTok, etc.) with centralized user management, there are agency platforms like:

• Marin Software
• Skai
• Smartly.io

These don't replace Google Ads Manager or Meta Business Manager—they sit on top of them to streamline campaign management and reporting across many client accounts.

If your goal is client onboarding and access management (rather than campaign management), I can also recommend tools specifically designed to automate requesting and granting permissions.

If you're managing advertising for many clients, the standard tools are the platform-native business management systems:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets an agency:

• Manage hundreds or thousands of client Google Ads accounts from one login.
• Assign users different permission levels (Administrative, Standard, Read only, Billing, etc.).
• Grant access without sharing passwords.
• Organize accounts into hierarchies and sub-manager accounts for teams. Google Support Google Support
• Meta (Facebook & Instagram): Use Meta Business Manager / Business Portfolio. It allows you to:

• Request partner access to client ad accounts.
• Assign team members roles such as Admin, Advertiser, or Analyst.
• Control permissions for ad accounts, Pages, Pixels, and other assets.
• Remove access centrally when staff or contractors leave. Facebook

For agencies managing many clients, the recommended practice is:

• The client owns the advertising account.
• The agency receives partner access rather than owning the client's assets.
• Individual agency employees are assigned only the permissions they need (least-privilege access). This makes onboarding, offboarding, and security much easier. Google Support Stackmatix

If you're looking for a tool that manages multiple advertising platforms (Google, Meta, LinkedIn, TikTok, etc.) with centralized user management, there are agency platforms like:

• Marin Software
• Skai
• Smartly.io

These don't replace Google Ads Manager or Meta Business Manager—they sit on top of them to streamline campaign management and reporting across many client accounts.

If your goal is client onboarding and access management (rather than campaign management), I can also recommend tools specifically designed to automate requesting and granting permissions.

If you're managing advertising for many clients, the standard tools are the platform-native business management systems:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets an agency:

• Manage hundreds or thousands of client Google Ads accounts from one login.
• Assign users different permission levels (Administrative, Standard, Read only, Billing, etc.).
• Grant access without sharing passwords.
• Organize accounts into hierarchies and sub-manager accounts for teams. Google Support Google Support
• Meta (Facebook & Instagram): Use Meta Business Manager / Business Portfolio. It allows you to:

• Request partner access to client ad accounts.
• Assign team members roles such as Admin, Advertiser, or Analyst.
• Control permissions for ad accounts, Pages, Pixels, and other assets.
• Remove access centrally when staff or contractors leave. Facebook

For agencies managing many clients, the recommended practice is:

• The client owns the advertising account.
• The agency receives partner access rather than owning the client's assets.
• Individual agency employees are assigned only the permissions they need (least-privilege access). This makes onboarding, offboarding, and security much easier. Google Support Stackmatix

If you're looking for a tool that manages multiple advertising platforms (Google, Meta, LinkedIn, TikTok, etc.) with centralized user management, there are agency platforms like:

• Marin Software
• Skai
• Smartly.io

These don't replace Google Ads Manager or Meta Business Manager—they sit on top of them to streamline campaign management and reporting across many client accounts.

If your goal is client onboarding and access management (rather than campaign management), I can also recommend tools specifically designed to automate requesting and granting permissions.

If you're managing advertising for many clients, the standard tools are the platform-native business management systems:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets an agency:

• Manage hundreds or thousands of client Google Ads accounts from one login.
• Assign users different permission levels (Administrative, Standard, Read only, Billing, etc.).
• Grant access without sharing passwords.
• Organize accounts into hierarchies and sub-manager accounts for teams. Google Support Google Support
• Meta (Facebook & Instagram): Use Meta Business Manager / Business Portfolio. It allows you to:

• Request partner access to client ad accounts.
• Assign team members roles such as Admin, Advertiser, or Analyst.
• Control permissions for ad accounts, Pages, Pixels, and other assets.
• Remove access centrally when staff or contractors leave. Facebook

For agencies managing many clients, the recommended practice is:

• The client owns the advertising account.
• The agency receives partner access rather than owning the client's assets.
• Individual agency employees are assigned only the permissions they need (least-privilege access). This makes onboarding, offboarding, and security much easier. Google Support Stackmatix

If you're looking for a tool that manages multiple advertising platforms (Google, Meta, LinkedIn, TikTok, etc.) with centralized user management, there are agency platforms like:

• Marin Software
• Skai
• Smartly.io

These don't replace Google Ads Manager or Meta Business Manager—they sit on top of them to streamline campaign management and reporting across many client accounts.

If your goal is client onboarding and access management (rather than campaign management), I can also recommend tools specifically designed to automate requesting and granting permissions.

If you're managing advertising for many clients, the standard tools are the platform-native business management systems:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets an agency:
  • Manage hundreds or thousands of client Google Ads accounts from one login.
  • Assign users different permission levels (Administrative, Standard, Read only, Billing, etc.).
  • Grant access without sharing passwords.
  • Organize accounts into hierarchies and sub-manager accounts for teams. support.google.com

• Meta (Facebook & Instagram): Use Meta Business Manager / Business Portfolio. It allows you to:
  • Request partner access to client ad accounts.
  • Assign team members roles such as Admin, Advertiser, or Analyst.
  • Control permissions for ad accounts, Pages, Pixels, and other assets.
  • Remove access centrally when staff or contractors leave. www.facebook.com

For agencies managing many clients, the recommended practice is:

• The client owns the advertising account.
• The agency receives partner access rather than owning the client's assets.
• Individual agency employees are assigned only the permissions they need (least-privilege access). This makes onboarding, offboarding, and security much easier. support.google.com

If you're looking for a tool that manages multiple advertising platforms (Google, Meta, LinkedIn, TikTok, etc.) with centralized user management, there are agency platforms like:

• Marin Software
• Skai
• Smartly.io

These don't replace Google Ads Manager or Meta Business Manager—they sit on top of them to streamline campaign management and reporting across many client accounts.

If your goal is client onboarding and access management (rather than campaign management), I can also recommend tools specifically designed to automate requesting and granting permissions.

If you're managing advertising for many clients, the standard tools are the platform-native business management systems:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets an agency:
  • Manage hundreds or thousands of client Google Ads accounts from one login.
  • Assign users different permission levels (Administrative, Standard, Read only, Billing, etc.).
  • Grant access without sharing passwords.
  • Organize accounts into hierarchies and sub-manager accounts for teams. support.google.com

• Meta (Facebook & Instagram): Use Meta Business Manager / Business Portfolio. It allows you to:
  • Request partner access to client ad accounts.
  • Assign team members roles such as Admin, Advertiser, or Analyst.
  • Control permissions for ad accounts, Pages, Pixels, and other assets.
  • Remove access centrally when staff or contractors leave. www.facebook.com

For agencies managing many clients, the recommended practice is:

• The client owns the advertising account.
• The agency receives partner access rather than owning the client's assets.
• Individual agency employees are assigned only the permissions they need (least-privilege access). This makes onboarding, offboarding, and security much easier. support.google.com

If you're looking for a tool that manages multiple advertising platforms (Google, Meta, LinkedIn, TikTok, etc.) with centralized user management, there are agency platforms like:

• Marin Software
• Skai
• Smartly.io

These don't replace Google Ads Manager or Meta Business Manager—they sit on top of them to streamline campaign management and reporting across many client accounts.

If your goal is client onboarding and access management (rather than campaign management), I can also recommend tools specifically designed to automate requesting and granting permissions.

If you're managing advertising for many clients, the standard tools are the platform-native business management systems:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets an agency:
  • Manage hundreds or thousands of client Google Ads accounts from one login.
  • Assign users different permission levels (Administrative, Standard, Read only, Billing, etc.).
  • Grant access without sharing passwords.
  • Organize accounts into hierarchies and sub-manager accounts for teams. support.google.com

• Meta (Facebook & Instagram): Use Meta Business Manager / Business Portfolio. It allows you to:
  • Request partner access to client ad accounts.
  • Assign team members roles such as Admin, Advertiser, or Analyst.
  • Control permissions for ad accounts, Pages, Pixels, and other assets.
  • Remove access centrally when staff or contractors leave. www.facebook.com

For agencies managing many clients, the recommended practice is:

• The client owns the advertising account.
• The agency receives partner access rather than owning the client's assets.
• Individual agency employees are assigned only the permissions they need (least-privilege access). This makes onboarding, offboarding, and security much easier. support.google.com

If you're looking for a tool that manages multiple advertising platforms (Google, Meta, LinkedIn, TikTok, etc.) with centralized user management, there are agency platforms like:

• Marin Software
• Skai
• Smartly.io

These don't replace Google Ads Manager or Meta Business Manager—they sit on top of them to streamline campaign management and reporting across many client accounts.

If your goal is client onboarding and access management (rather than campaign management), I can also recommend tools specifically designed to automate requesting and granting permissions.

If you're managing advertising for many clients, the standard tools are the platform-native business management systems:

• Google Ads: Use a Google Ads Manager Account (formerly MCC – My Client Center). It lets an agency:
  • Manage hundreds or thousands of client Google Ads accounts from one login.
  • Assign users different permission levels (Administrative, Standard, Read only, Billing, etc.).
  • Grant access without sharing passwords.
  • Organize accounts into hierarchies and sub-manager accounts for teams. support.google.com

• Meta (Facebook & Instagram): Use Meta Business Manager / Business Portfolio. It allows you to:
  • Request partner access to client ad accounts.
  • Assign team members roles such as Admin, Advertiser, or Analyst.
  • Control permissions for ad accounts, Pages, Pixels, and other assets.
  • Remove access centrally when staff or contractors leave. www.facebook.com

For agencies managing many clients, the recommended practice is:

• The client owns the advertising account.
• The agency receives partner access rather than owning the client's assets.
• Individual agency employees are assigned only the permissions they need (least-privilege access). This makes onboarding, offboarding, and security much easier. support.google.com

If you're looking for a tool that manages multiple advertising platforms (Google, Meta, LinkedIn, TikTok, etc.) with centralized user management, there are agency platforms like:

• Marin Software
• Skai
• Smartly.io

These don't replace Google Ads Manager or Meta Business Manager—they sit on top of them to streamline campaign management and reporting across many client accounts.

If your goal is client onboarding and access management (rather than campaign management), I can also recommend tools specifically designed to automate requesting and granting permissions.

If you mean Meta/Facebook ad accounts, the tool is Meta Business Manager (now part of Meta Business Suite/Business Portfolio).

It lets an agency:

• Manage multiple client ad accounts from one business portfolio
• Add employees/agency users
• Assign roles and granular permissions
• Give access to specific ad accounts, Pages, pixels, catalogs, etc.
• Keep client assets separate while allowing the agency to manage them

Meta Business Suite / Business Manager

For an agency, the typical setup is one agency Business Portfolio + client assets shared with the agency, rather than giving employees direct ownership of each client's account.

If you mean Meta/Facebook advertising, the tool is Meta Business Manager (Business Portfolio). It lets an agency:

• Add/manage multiple client ad accounts
• Give employees or partners access
• Assign roles and granular permissions
• Keep client assets separated while managing them centrally

For agencies managing many clients, Meta Business Suite/Business Manager is generally the core access-control system.

If you mean an advertising agency managing many clients’ ad accounts, the tool is usually a business/agency manager platform that supports client access, user roles, and permissions.

Common options:

• Meta Business Suite (Meta Business Manager) — Used by agencies to manage multiple Facebook and Instagram ad accounts, assign partners, control employee/client permissions, and separate client assets.
• Google Ads Manager Account (MCC) — Lets agencies manage many Google Ads accounts from one dashboard, add users, and control access levels.
• LinkedIn Campaign Manager with Business Manager features — For agencies managing multiple LinkedIn advertising accounts and team access.
• TikTok Business Center — Provides centralized control of multiple TikTok ad accounts, users, and permissions.

If you’re referring specifically to Meta ads, the answer is usually Meta Business Manager / Meta Business Suite. If you’re managing multiple ad platforms, agencies often use a combination of these plus an agency workflow tool.

If you mean an agency managing many clients’ ad accounts, the main tools are:

• Meta ads: Meta Business Manager / Business Portfolio — agencies can manage multiple client ad accounts, assign team members, and give roles such as Admin, Advertiser, or Analyst. Clients can grant the agency partner access without giving up ownership. www.facebook.com
• Google Ads: Google Ads Manager Account (MCC) — designed specifically for agencies managing multiple client accounts from one place. It supports user access levels such as Administrative, Standard, Read-only, Billing, and Email-only. support.google.com
• LinkedIn: LinkedIn Business Manager — centralizes people, ad accounts, Pages, and permissions, with separate organization-level and ad-account-level roles. www.linkedin.com

If you're asking for one third-party tool that handles client access/onboarding across Meta, Google, TikTok, LinkedIn, etc., Portaal is an example: it lets an agency send clients an access link and automate permission requests and revocation across multiple ad platforms. portaal.io

For a typical agency: use Meta Business Manager + Google Ads MCC as the core account-management setup.

If you mean Meta/Facebook & Instagram ads, the tool is Meta Business Manager (Business Portfolio). Agencies use it to:

• Manage multiple client ad accounts from one place
• Give clients or employees specific roles and permissions
• Request/access client assets without sharing passwords
• Manage ad accounts, Pages, pixels, catalogs, etc.

If you mean Google Ads, the equivalent is a Google Ads Manager Account (MCC), which lets an agency manage many client Google Ads accounts under one login.

In short:

• Meta → Business Manager / Business Portfolio
• Google Ads → Manager Account (MCC)

If you tell me whether you're talking about Meta, Google, TikTok, or another platform, I can point you to the exact agency setup.

If you mean Meta/Facebook ad accounts, the tool is Meta Business Manager (now part of Meta Business Suite).

It lets an agency:

• Manage multiple client ad accounts from one business portfolio
• Add clients and employees/users
• Assign roles and permissions (admin, advertiser, analyst, etc.)
• Control access to individual ad accounts, Pages, pixels, catalogs, and other assets
• Keep client ownership separate while giving your agency the access it needs

For Google Ads, the equivalent is a Google Ads Manager Account (MCC), which is specifically designed for agencies managing many client accounts.

In short:
Meta → Business Manager/Business Suite
Google Ads → Manager Account (MCC)

If you mean an agency managing many clients’ ad accounts, the best fit depends on the ad platform:

• Google Ads: Manager Account (MCC) — specifically designed for agencies to manage multiple client accounts from one login. It also supports user access levels such as Admin, Standard, Read-only, Email-only, and Billing. support.google.com

Google Ads Manager Accounts

• Meta Ads: Meta Business Manager / Business Portfolio — lets an agency manage people, partners, assets, and permissions across client ad accounts.
• Multiple platforms + client onboarding: Leadsie is designed for agencies to request and organize client access across Meta, Google, LinkedIn, TikTok, Shopify, and other platforms, with view/manage access options. www.leadsie.com
• Agency reporting/client portal: AgencyAnalytics provides granular client and staff permissions and separate client logins, but it's more of a reporting/client-management layer than the underlying ad-account permission system. agencyanalytics.com

If you're asking for one tool specifically to handle access, roles, and permissions across many ad accounts, I'd look at Leadsie first. If you're only dealing with Google Ads, use a Google Ads Manager Account (MCC).