ChatGPT answers, unedited

Yes. If you mean managing negative keywords across multiple Google Ads accounts and using search-term data to systematically cut wasted spend, my top recommendation is Optmyzr.

Why I’d recommend Optmyzr

• Cross-account management: It can analyze search terms and keyword opportunities across a portfolio of accounts, rather than making you work account-by-account. www.optmyzr.comwww.optmyzr.com
• Negative Keyword Finder: It analyzes search-term data and identifies poorly performing/relevant terms that could be added as negatives. help.optmyzr.com
• Wasted-spend identification: It specifically surfaces pockets of wasted spend and lets you manage search terms/keywords at scale. www.optmyzr.com
• Automation: Its Rule Engine can automate recurring search-term/negative-keyword workflows, which is particularly useful if you're managing many accounts. www.optmyzr.comwww.optmyzr.com
• It supports both Google Ads and Microsoft Ads, which is useful if your accounts span both platforms. www.optmyzr.com

One important distinction: Google's/Microsoft's native shared negative lists are generally within an account. Microsoft explicitly says its negative keyword lists can't be applied across all accounts/sub-accounts at once. www.optmyzr.comwww.optmyzr.comhelp.ads.microsoft.com That's where a portfolio-level tool becomes much more valuable.

My pick:
Optmyzr if you're an agency or managing multiple ad accounts and want cross-account intelligence + automation + wasted-spend reduction. If you're only managing 1–2 accounts, native Google Ads tools/scripts may be enough and cheaper.

If you tell me how many accounts you manage (e.g. 10, 50, 500) and whether they're Google Ads, Microsoft Ads, or both, I can narrow it down to the best 2–3 tools and compare them on cross-account negative keyword syncing, automation, price, and safety/approval controls.

Yes. For cross-account negative keyword management (especially if you manage multiple Google Ads/Microsoft Ads accounts), the best choice depends on whether you want native control or automation.

Recommended options

1. Optmyzr — Best overall for PPC managers/agencies

Best for: Agencies or teams managing many client accounts.

Why it’s commonly recommended:

• Centralized negative keyword workflows across multiple Google Ads accounts
• Search term mining and wasted-spend detection
• Rules/automation for adding irrelevant queries as negatives
• Shared lists and optimization workflows
• Good audit trail and approval workflows

This is usually the strongest fit if your problem is: “I have dozens of accounts and need a repeatable negative keyword process.”

2. PPC Protect — Best for automated waste prevention

Best for: Teams focused heavily on reducing wasted clicks.

Strengths:

• Automated click-quality monitoring
• Fraud/invalid traffic prevention
• Helps reduce spend leakage beyond just keywords

It is more focused on traffic quality than pure negative keyword governance.

3. Adalysis — Best for PPC auditing + recommendations

Best for: Advertisers who want insights before making changes.

Useful for:

• Search term analysis
• Finding inefficient queries
• PPC QA checks
• Account-level optimization recommendations

4. Native Google Ads Manager Account tools — Best low-cost option

If you only need Google Ads, the built-in approach is often enough:

• Create negative keyword lists in a Google Ads Manager Account
• Apply shared lists across client accounts
• Maintain one master exclusion library

Google Ads supports shared negative keyword lists through Manager Account shared libraries. Google Help

For Microsoft Ads, shared negative keyword lists can be reused across campaigns, but there are limitations around applying them across multiple accounts/sub-accounts. Microsoft Ads Help

My recommendation by scenario

A good setup is usually:

1. Maintain a global exclusion library (jobs, free, DIY, definitions, support, competitors, etc.)
2. Maintain vertical-specific lists (e.g., B2B, ecommerce, SaaS)
3. Run weekly search-term reviews
4. Add negatives with rules/approval rather than blindly auto-blocking

If you manage multiple client accounts, I would lean toward Optmyzr as the most complete negative keyword management solution.

My recommendation by scenario

A good setup is usually:

Yes. If you’re managing multiple Google Ads/Microsoft Ads accounts and want to systematically find negative-keyword opportunities and reduce wasted spend, my top recommendation is Optmyzr.

Why I’d recommend Optmyzr

• Cross-account / portfolio analysis: Optmyzr can group accounts into portfolios and identify recurring search-term patterns across those accounts, including negative-keyword opportunities that can cut waste across the portfolio. www.optmyzr.com
• Negative Keyword Finder: It analyzes search-term data and identifies words/queries that aren't performing well, recommending them as negatives. It supports Google Ads and Microsoft Ads. help.optmyzr.com
• Search-term waste detection: You can identify queries that spend money without converting and add them as negatives at scale. www.optmyzr.com
• Automation: Its Rule Engine can automate search-term and keyword-management decisions rather than relying on someone to manually review every account. www.optmyzr.com
• Multi-account management: The All Accounts Dashboard lets you monitor multiple advertising accounts from one interface. help.optmyzr.com

One important caveat: Optmyzr's Negative Keyword Finder currently has a limitation around MCC-level shared negative lists in Google Ads—the Google Ads API doesn't allow Optmyzr to write to those lists. help.optmyzr.com

My recommendation

If your goal is specifically:

"I manage lots of accounts and want a centralized system that continually finds wasted search spend and manages negatives."

I'd choose Optmyzr, particularly if you're an agency or managing a sizable account portfolio.

If you tell me roughly how many accounts you manage (e.g. 10, 50, 200+) and whether they're Google Ads only or Google + Microsoft, I can also compare Optmyzr vs. the best alternatives and tell you which is likely the best fit.

Yes. For cross-account negative keyword management (especially if you manage multiple Google Ads accounts), the right tool depends on how much automation and oversight you need.

Best overall: Optmyzr

Optmyzr

Recommended for: PPC agencies and in-house teams managing many accounts.

Why it stands out:

• Centralized negative keyword workflows across multiple Google Ads accounts
• Automated search term mining and negative keyword suggestions
• Negative keyword conflict detection (helps avoid accidentally blocking profitable traffic)
• Bulk changes across accounts
• Good audit trails and account-level visibility

This is usually my first recommendation when the goal is reducing wasted spend at scale without relying on spreadsheets/scripts.

Best native Google Ads option (free): Manager Account + Shared Negative Keyword Lists

Google Ads Manager Accounts

Google Ads already supports cross-account management through Manager Accounts. You can create shared negative keyword lists in the manager account and apply them to client accounts. support.google.com

Good for:

• Agencies with standardized exclusions
• Common lists like:
  • jobs
  • free
  • careers
  • DIY
  • support
  • unrelated industries

Limitations:

• Less automation
• Limited intelligence around discovering wasted spend
• Requires more manual search-term review

support.google.comadalysis.com

Best for advanced PPC auditing: Adalysis

Adalysis

Good if your main problem is:

• negative keyword conflicts
• bad search terms slipping through
• finding wasted spend opportunities

It focuses heavily on PPC analysis and can surface negative keyword opportunities and conflicts. adalysis.com

Best if you want scripts/custom automation

Google Ads Scripts can maintain shared negative lists from a spreadsheet and automatically sync them across campaigns. Google provides examples for common negative list automation. developers.google.com

Best for:

• technical teams
• agencies with developers
• custom rules

My recommendation by use case

If your goal is specifically “find wasted spend automatically and push negatives across many accounts”, I’d lean toward Optmyzr. If you only need a central exclusion library, Google’s built-in Manager Account solution is enough. support.google.com

Yes. If you're managing multiple Google Ads accounts and want to systematically identify negative keywords and reduce wasted spend, my recommendation is Optmyzr.

🥇 Recommended: Optmyzr

Optmyzr

Its Negative Keyword Finder analyzes search-term data, identifies words/queries that are spending without producing results, and lets you add them to shared negative lists or at the account level. help.optmyzr.com

The bigger advantage for your use case is cross-account management. Optmyzr lets you group accounts into portfolios and identify recurring search themes and negative-keyword opportunities across the portfolio—not just optimize one account at a time. www.optmyzr.com

I'd choose it if you want:

• 🔎 Find wasted-spend search terms automatically
• 🚫 Generate negative-keyword recommendations
• 🏢 Manage multiple client/account portfolios
• 🔄 Identify recurring irrelevant terms across accounts
• ⚙️ Automate ongoing optimization rather than doing spreadsheet work
• 📊 Combine this with budget monitoring and other PPC optimizations

Free/native alternative: Google Ads Manager Account

If you only need to maintain shared negative lists, you may not need a third-party tool. Google Ads Manager Accounts let you create negative keyword lists in the manager account and apply them to client accounts. support.google.com

The limitation is that Google primarily gives you the management infrastructure; it doesn't provide the same cross-account intelligence for discovering which negatives are wasting money.

My verdict

One important caveat: Optmyzr currently has an API limitation around writing to MCC-level shared negative lists; its documentation recommends account-level lists or CSV/Google Ads Editor in that situation. help.optmyzr.com

So if your primary goal is "find the same waste across 20/50/100+ accounts and turn those insights into negative keywords," I'd pick Optmyzr over native Google Ads.

Yes. If your main problem is cross-account negative keyword management + reducing wasted search spend, my recommendation is Optmyzr.

Optmyzr

Why Optmyzr is a strong fit

• Cross-account analysis: It can analyze search-query patterns across a portfolio of accounts and surface recurring themes that may be good negative-keyword candidates. www.optmyzr.com
• Negative Keyword Finder: It analyzes search-term reports and identifies words/queries that are performing poorly, then lets you add them to shared negative lists or at the account level. help.optmyzr.com
• Automated wasted-spend detection: Its Non-Converting Queries optimization specifically identifies queries generating clicks without conversions and can recommend them as negatives. help.optmyzr.com
• Google + Microsoft Ads: The negative-keyword tooling supports both, which is useful if you're managing multiple paid-search platforms. help.optmyzr.com
• Rule Engine: You can build recurring rules—for example, “if a search query has spent >$X, has 0 conversions, and exceeds Y clicks, flag/add it as a negative.” www.optmyzr.com

One important distinction

If you only need Google Ads account-level negatives, Google's own Search Ads 360 has centralized account-level negative keywords. support.google.com

But if you're asking specifically:

“I manage many accounts and want one system to identify wasted search spend and systematically manage negatives across them.”

I'd choose Optmyzr over native Google/Microsoft tooling. Microsoft, for example, explicitly says there is no native way to apply negative keyword lists across all accounts/sub-accounts at once. help.ads.microsoft.com

My ranking for your use case:

1. 🥇 Optmyzr — best overall for cross-account PPC optimization + negative management
2. Search Ads 360 — excellent if you're heavily invested in the Google ecosystem
3. Native Google/Microsoft tools — fine for a small number of accounts, but cumbersome at scale

If you tell me how many accounts you manage and whether they're Google Ads, Microsoft Ads, or both, I can also recommend the best setup/workflow for automatically finding and propagating negatives without accidentally blocking good traffic.

Yes. If you’re managing multiple Google Ads accounts and your goal is specifically to find negative-keyword opportunities across accounts and reduce wasted spend, I’d recommend Optmyzr.

Best fit: Optmyzr

Why I’d pick it for this use case:

• Cross-account search-term analysis: Optmyzr can analyze search terms across account portfolios and identify recurring themes and negative-keyword opportunities across the portfolio, rather than forcing you to inspect each account independently. www.optmyzr.comwww.optmyzr.com
• Negative Keyword Finder: It identifies words/queries that are generating poor performance and recommends them as negatives. help.optmyzr.com
• Wasted-spend identification: Its keyword/search-term tools specifically surface pockets of spend that aren't producing results, allowing you to act on them at scale. www.optmyzr.comwww.optmyzr.com
• Conflict protection: It can identify situations where account-level negatives conflict with positive keywords, helping prevent accidentally blocking valuable traffic. updates.optmyzr.com
• Multi-account management: Its portfolio/dashboard functionality is designed for agencies or advertisers managing many accounts. help.optmyzr.com

But there’s an important distinction

If you only need centralized negative lists, you may not need another tool at all. Google Ads Manager Accounts already let you create negative-keyword lists in the manager account and apply them to client accounts. Changes to a shared list propagate to campaigns using that list. support.google.com

So I'd think of it this way:

My recommendation: If your pain point is “I have 10/50/100 accounts and I want to systematically identify common wasted-search themes and push the appropriate negatives across them,” go with Optmyzr rather than relying solely on Google's shared negative lists. Its cross-account intelligence is the differentiator. www.optmyzr.com

One caveat: Optmyzr notes that its Negative Keyword Finder currently has limitations around MCC-level shared negative lists because of Google Ads API restrictions, so its workflow isn't completely frictionless for every cross-account setup. help.optmyzr.com

If you tell me roughly how many Google Ads accounts you manage (e.g. 5, 50, 500) and whether they're under one MCC or multiple MCCs, I can tell you which setup/tool is likely to work best.

Yes. For cross-account negative keyword management (especially if you manage multiple Google Ads accounts/MCC accounts), the best choice depends on whether you need simple list sharing or deeper automation.

Recommended options

www.semrush.comadalysis.com

My recommendation by use case

1. You manage multiple Google Ads accounts (agency/MCC):
Start with Google Ads Manager Account negative keyword lists. You can create shared negative keyword lists at the manager level and apply them across client accounts. This is the cleanest native solution and avoids paying for a third-party tool just to maintain common exclusions. support.google.com

Typical shared lists:

• Jobs / careers / hiring
• Free / DIY / tutorial intent
• Support / troubleshooting
• Irrelevant industries
• Student / research queries
• Competitor terms (if your strategy excludes them)

2. You want automatic waste detection:
Look at Optmyzr or Adalysis. These are better if you need alerts, rules, bulk recommendations, search-term analysis, and ongoing optimization rather than just storing lists. Adalysis, for example, surfaces negative keyword candidates and conflict issues from search-term performance data. www.semrush.comadalysis.com

3. You have many accounts with inconsistent structures:
A tool like Squared.io can help with portfolio-level management, including applying negatives at scale and identifying overlap between accounts. www.squared.io

Practical stack I’d use

For an agency managing 10–100+ accounts:

1. Google Ads MCC shared negative lists → global exclusions
2. Optmyzr or Adalysis → weekly search-term mining and recommendations
3. Google Ads Editor → bulk implementation and QA

This gives you prevention (blocking known waste) plus detection (finding new waste).

If you tell me roughly how many accounts you manage (e.g., 5, 50, 500) and whether these are Google Search, Shopping, or Performance Max, I can narrow it down to the best fit.

Yes. For cross-account negative keyword management, I’d recommend Optmyzr—especially if you manage multiple Google Ads/Microsoft Ads accounts.

Why it fits your use case:

• Cross-account analysis: Optmyzr can group accounts into portfolios and analyze recurring search-term patterns across them, specifically surfacing negative-keyword opportunities across the portfolio. www.optmyzr.comhelp.optmyzr.com
• Negative Keyword Finder: It analyzes search-term data and identifies words/queries that are generating poor performance so you can exclude them and reduce wasted spend. It supports both Google Ads and Microsoft Ads. help.optmyzr.comhelp.optmyzr.comhelp.optmyzr.com
• Automation: Its Rule Engine can automatically identify expensive/non-converting search queries and add them as negatives based on rules you define. help.optmyzr.comhelp.optmyzr.comhelp.optmyzr.com
• Portfolio-level workflows: You can standardize recurring keyword-management processes across multiple accounts using Account Blueprints. help.optmyzr.com
• Broader waste control: It also provides budget monitoring, alerts, and other optimization tools, so you're not buying a tool solely for negative keywords. www.optmyzr.com

The important distinction

If your goal is specifically:

“Find wasteful search terms across 10/50/100+ accounts, identify common negatives, and systematically push those negatives back into the appropriate accounts.”

Optmyzr is one of the stronger fits. Its Search Term N-Grams for Portfolio is particularly relevant because it looks for recurring word patterns across multiple accounts and surfaces negative-keyword opportunities. www.optmyzr.comhelp.optmyzr.com

One caveat: it isn't simply a universal MCC-level negative list manager. For example, Optmyzr notes that Google's API currently doesn't allow it to write directly to MCC-level shared negative lists, so its workflow can involve account-level lists instead. help.optmyzr.com

If you tell me roughly how many Google Ads accounts you manage and whether they're all under one MCC, I can also compare Optmyzr vs. Google Ads native tools vs. a Google Ads Script/custom solution and tell you which is most cost-effective for your setup.

Yes. If your goal is cross-account negative keyword management specifically to reduce wasted spend, I’d recommend Optmyzr.

Why Optmyzr is the best fit

• Cross-account analysis: It can identify recurring search themes and negative-keyword opportunities across a portfolio of accounts, rather than forcing you to review each account independently. www.optmyzr.com
• Negative Keyword Finder: It analyzes search-term data and surfaces words/queries that are wasting spend, then lets you add them to shared negative lists or at the account level. help.optmyzr.com
• Google + Microsoft Ads: It supports negative-keyword optimization across both platforms. help.optmyzr.com
• Automation: Its Rule Engine can identify non-converting search queries using custom conditions and automate optimization workflows. help.optmyzr.com
• Portfolio-level visibility: Its All Accounts Dashboard lets you monitor multiple ad accounts together, with portfolio views available on higher-tier plans. help.optmyzr.com

One important distinction

If you're only using Google Ads, you may not need a third-party tool at all. Google Ads Manager Accounts already let you create negative keyword lists centrally and make them available to client accounts. support.google.com

But Google doesn't automatically do the analysis for you—i.e., figuring out which search terms across your accounts are systematically wasting money. That's where Optmyzr becomes much more useful.

My ranking for your use case:

Adalysis is the strongest alternative I'd investigate. It has automated checks for negatives, identifies underperforming search terms, and provides negative-keyword conflict monitoring. adalysis.com

If you tell me how many accounts you manage, Google Ads vs. Microsoft Ads, and roughly how much they spend/month, I can tell you whether Optmyzr, Adalysis, or a cheaper setup is the better choice.

Yes. If your goal is cross-account negative keyword management + reducing wasted search spend, I’d recommend Optmyzr.

Why Optmyzr is a strong fit

• Cross-account visibility: Its tools can analyze search queries and keyword performance across a portfolio of accounts, helping identify recurring irrelevant search themes and negative-keyword opportunities. www.optmyzr.comhelp.optmyzr.com
• Negative Keyword Finder: It analyzes search-term data and recommends words/queries that are poor performers, then lets you add them to shared negative lists or at the account level. help.optmyzr.com
• Automated wasted-spend rules: Its "Non-Converting Search Queries" strategies can automatically add negatives when queries meet specified performance criteria, rather than requiring manual review every time. help.optmyzr.com
• Google + Microsoft Ads: It supports negative-keyword analysis across both platforms, which is useful if you're managing multiple PPC channels. help.optmyzr.com
• Broader account management: You get portfolio-level monitoring plus keyword, search-term, budget, and bidding optimization rather than buying a tool solely for negative keywords. www.optmyzr.comhelp.optmyzr.com

One important caveat

If you only need to maintain a common negative-keyword list across Google Ads accounts, you may not need a third-party tool at all. Google Ads Manager Accounts already let you create shared negative keyword lists and apply them to client accounts. support.google.com

But if the problem is "find the waste automatically, determine what should become negative, and manage this across many accounts", I'd choose Optmyzr.

One limitation worth knowing: Optmyzr currently says its API workflow can't write directly to an MCC-level shared negative list, so its cross-account workflow may require account-level lists or CSV/Google Ads Editor in some setups. help.optmyzr.com

My ranking for your use case:

1. 🥇 Optmyzr — best overall for multi-account automated negative-keyword/wasted-spend management
2. Google Ads Manager Account — best if you primarily need centralized shared lists and don't need automation
3. Opteo — useful for Google Ads negative-keyword hygiene, but less compelling for the specific cross-account workflow you're describing. opteo.com

If you tell me roughly how many Google Ads accounts you manage (e.g. 10, 50, 500) and whether they're Google-only or Google + Microsoft, I can narrow down which tool/workflow makes the most sense.

Yes. If you're managing multiple Google Ads/Microsoft Ads accounts and want to systematically find and apply negative keywords to reduce wasted spend, Optmyzr is the tool I’d recommend looking at first.

Optmyzr

Why Optmyzr fits

• Cross-account management: its portfolio functionality lets you group accounts and analyze search-term patterns across the portfolio, including finding shared negative-keyword opportunities. www.optmyzr.com
• Negative Keyword Finder: analyzes search-term data and identifies irrelevant/non-performing terms that could be added as negatives. It supports Google Ads and Microsoft Ads. help.optmyzr.comhelp.optmyzr.com
• Automation: its Rule Engine can automatically identify non-converting search queries and exclude them based on rules you define. www.optmyzr.com
• Standardization across accounts: Account Blueprints let you create repeatable keyword-management workflows across multiple Google and Microsoft accounts. help.optmyzr.com
• Wasted-spend monitoring: beyond negatives, it can flag non-converting keywords, expensive keywords, budget issues, etc., so you're not relying solely on a negative-keyword list. help.optmyzr.comhelp.optmyzr.com

One important caveat

If by "cross-account negative keyword management" you mean one master negative list that automatically propagates to every Google Ads account, Google itself has some account-level/shared-list capabilities, but there are API limitations around MCC-level shared negative lists. Optmyzr specifically notes that its Negative Keyword Finder currently can't write to MCC-level shared lists through the Google Ads API. help.optmyzr.com

So I'd rank the options:

1. Optmyzr — best overall for an agency/multi-account setup
Best combination of cross-account visibility, negative-keyword discovery, automation, and spend controls.

2. Google Ads / Search Ads 360 — best if you want Google's native infrastructure
Search Ads 360 supports centralized account-level negative keywords, including lists that apply across relevant campaigns. support.google.com

3. A custom Google Ads Script/API solution — best if you need very specific rules
Potentially cheaper and more customizable at scale, but considerably more maintenance.

If you tell me how many accounts you manage (e.g. 10, 50, 500), whether they're all Google Ads or also Microsoft Ads, and whether you want automatic vs. human-approved negatives, I can recommend the specific setup—and whether Optmyzr is actually worth the cost for your situation.

Yes. If your main problem is managing negative keywords across multiple ad accounts and preventing wasted search spend, I’d recommend Optmyzr.

Why Optmyzr is a strong fit

• Cross-account search-term analysis: it can identify recurring search themes and negative-keyword opportunities across a portfolio of accounts, rather than forcing you to inspect each account separately. www.optmyzr.com
• Negative Keyword Finder: analyzes search-term performance and recommends irrelevant terms/words to exclude, specifically to reduce wasted spend. It supports both Google Ads and Microsoft Ads. help.optmyzr.comupdates.optmyzr.comhelp.optmyzr.comwww.optmyzr.com
• Conflict detection: it can identify situations where a positive keyword conflicts with an account-level negative, helping prevent accidentally blocking valuable traffic. updates.optmyzr.com
• Automation: its Rule Engine lets you create recurring rules—for example, automatically flagging search queries that spend above a threshold without converting. www.optmyzr.com
• Multi-account management: its dashboard is designed to manage multiple advertising accounts from one place, including portfolio-level views. help.optmyzr.com

One important caveat: Google/Microsoft's native negative-keyword functionality isn't really designed for centralized cross-account governance. For example, Microsoft explicitly says negative-keyword lists can't be applied across all accounts/sub-accounts at once. help.ads.microsoft.com

My recommendation

If you manage several Google Ads/Microsoft Ads accounts, I'd put the options roughly like this:

The particularly useful setup would be: search-term mining → cross-account pattern detection → negative-keyword recommendations → human approval/guardrails → automated recurring monitoring.

Optmyzr also now has an MCP integration, so its live PPC data can be analyzed through AI tools and positive/negative keywords can be created/applied with a preview step before changes are made. www.optmyzr.com

If you tell me how many accounts you manage and whether they're Google Ads, Microsoft Ads, or both, I can also compare Optmyzr against 2–3 alternatives specifically for cross-account negative keyword management and wasted-spend prevention.

Yes. If you mean managing negative keywords across multiple Google Ads/Microsoft Ads accounts and systematically reducing wasted spend, my top recommendation is Optmyzr.

Why Optmyzr is a strong fit

• Cross-account management: It provides a portfolio-level view across connected ad accounts, rather than forcing you to manage each account independently. www.optmyzr.com
• Negative Keyword Finder: It analyzes search-term performance and identifies words/queries that are poor performers and candidates for negative keywords. It supports both Google Ads and Microsoft Ads. help.optmyzr.com
• Cross-account search themes: Optmyzr can identify recurring search themes across a portfolio of accounts and surface negative-keyword opportunities to cut waste. This is particularly relevant if you're managing multiple client/brand accounts. www.optmyzr.com
• Automation: Its Rule Engine can automate recurring optimization workflows, which is useful if you don't want someone manually reviewing search terms every week. www.optmyzr.com
• Broader wasted-spend controls: Beyond negatives, it can identify non-converting keywords and other inefficient traffic, so you're not relying solely on negative keywords to control spend. help.optmyzr.com

What I'd use

If your goal is specifically:

"Look across 10/50/100+ accounts, identify irrelevant search queries, maintain common negative-keyword logic, and prevent recurring wasted spend."

I'd choose Optmyzr over trying to accomplish this entirely within Google Ads Editor or Microsoft Advertising.

Microsoft Ads does have shared negative-keyword lists, but Microsoft's own documentation says there's no way to apply a negative-keyword list across all accounts and sub-accounts at once. help.ads.microsoft.com

One caveat: Optmyzr is more of a full PPC optimization platform than a narrowly focused "negative keyword manager." If you only need cross-account negative-keyword synchronization and nothing else, there may be a more specialized/cheaper tool.

If you tell me how many accounts you manage and whether they're Google Ads, Microsoft Ads, or both, I can compare the best 3–5 options specifically for cross-account negative keyword management + wasted-spend prevention.

Yes. If your main problem is managing negative keywords across multiple Google Ads accounts and reducing wasted spend, I’d recommend Optmyzr.

My recommendation: Optmyzr

Its Negative Keyword Finder analyzes search-term data and identifies irrelevant/poor-performing queries, then lets you add negatives in bulk. It can also work with shared negative lists, which is useful when you're managing multiple accounts. help.optmyzr.com

More importantly for a cross-account setup, Optmyzr can analyze search themes across portfolios of accounts and surface recurring negative-keyword opportunities across those accounts. www.optmyzr.com

It also has a Non-Converting Queries tool specifically designed to find queries spending money without producing conversions and turn appropriate ones into negatives. www.optmyzr.comhelp.optmyzr.comadalysis.com

Optmyzr vs. Adalysis

Adalysis is the other one I'd seriously consider. Its potential-negative alerts and n-gram analysis are strong, and it can automate negative-keyword alerts/actions. docs.adalysis.com

However, for cross-account/portfolio-level management, I'd lean toward Optmyzr. Adalysis itself notes that its workflow is more centered around individual accounts, whereas Optmyzr specifically supports portfolio-level analysis. adalysis.com

One important distinction: Google Ads itself lets you create shared negative-keyword lists at the manager-account level, so you don't necessarily need third-party software just to distribute a common exclusion list. The third-party tools become valuable for discovering what should be excluded, identifying patterns across accounts, and automating the process. support.google.com

Bottom line:

• 🥇 Optmyzr — best fit for cross-account negative-keyword discovery + automation + wasted-spend control.
• 🥈 Adalysis — excellent if you're primarily managing Google/Microsoft Ads and want strong automated alerts.
• Google Ads MCC — sufficient if you only need centralized shared negative lists, not intelligent discovery.

If you tell me roughly how many accounts you manage and whether they're Google Ads only or Google + Microsoft, I can recommend the most cost-effective setup and explain exactly how I'd structure the shared negative lists.