Broad Match Modifier vs Negative Keywords: Filtering After BMM
In short: BMM used to do its filtering with required words; that job now belongs entirely to negative keywords. Broad Match Modifier was retired into phrase match, so plus signs no longer guarantee a term appears in the query. Negatives are the only remaining mechanism that removes queries from eligibility outright.
By the AdFlint research team · Fact-checked against current Google and Meta platform behavior · Last reviewed July 2026
Broad Match Modifier
Retired Google Ads match type, written with plus signs, that required every marked term to appear somewhere in the query in any order.
It was folded into phrase match in 2021: existing BMM keywords now behave as phrase match, and new ones cannot be created. Old account documentation and agency templates still carry the plus syntax, which is why the term keeps surfacing. If you inherit an account full of +keywords, audit them as phrase match and expect their traffic profile to have drifted well away from the original setup.
Full definitionNegative Keywords
Terms you add to stop ads from showing on matching queries, applied at ad group or campaign level or through shared lists.
Negatives have their own match types and, unlike positive keywords, do not expand to close variants, so a misspelling you want blocked has to be listed itself. You build them from the search terms report plus shared lists covering jobs, free, DIY, and competitor traffic. The classic mistake is a broad negative that quietly overlaps a money keyword, silencing an ad group with no visible error anywhere.
Full definitionSide by side.
The differences that actually change what happens in your account.
| Broad Match Modifier | Negative Keywords | |
|---|---|---|
| Status | Retired; serves under phrase match rules | Live and unchanged |
| Direction | Decided which queries could serve | Decides which queries cannot serve |
| Word guarantee | Once guaranteed marked words; no longer does | Blocks only the exact terms you list |
| Close variants | Expands to paraphrases as phrase match does | No expansion; list misspellings yourself |
| Scope | One keyword row in an ad group | Ad group, campaign, or shared list across the account |
| Role after the change | Legacy keywords to audit | The primary filter left in the account |
What actually separates them.
BMM enforced inclusion and negatives enforce exclusion, so they were never interchangeable even before BMM was retired.
Since the retirement, a +keyword cannot guarantee that any specific word appears in the query, which pushes all word-level control onto the negative list.
Negatives do not expand to close variants, so blocking a misspelling means listing that misspelling explicitly, unlike the positive keyword beside it.
Negatives can be applied at ad group, campaign, or shared list level, giving account-wide control that no match type has ever offered.
A negative always beats an eligible positive keyword, which is why negatives, not match types, are how you steer queries between campaigns.
Which one should you use?
Use Broad Match Modifier when
- You are auditing inherited keywords and need to know what the plus-sign syntax now means.
- An old process document assumed BMM would guarantee certain words and you are updating it.
- You are reconciling why an account's query mix drifted after the match type change.
- You need to decide which legacy keywords move to exact and which stay at phrase width.
Use Negative Keywords when
- Search terms show recurring themes you never want to pay for again.
- You need account-wide hygiene lists for jobs, free, DIY, reviews, and competitor names.
- Two campaigns overlap and you need queries routed to the one meant to serve them.
- A legacy BMM keyword is now matching paraphrases its original design would have excluded.
Common questions.
Can negative keywords recreate what BMM did?
Not exactly, but they cover the practical need. BMM guaranteed inclusion of chosen words; negatives instead remove the query shapes you do not want. In practice a phrase match keyword plus a well-built negative list produces a similar traffic profile, with the difference that you are describing what to exclude rather than what must appear.
Do I need more negatives now that BMM is gone?
Usually yes on inherited accounts. Those keywords now accept same-meaning paraphrases they previously excluded, so the old negative list was built against a narrower traffic profile. Re-run the search terms report over recent history and rebuild negatives against what the keywords buy today rather than what they bought under the old rules.
Which negative match type replaces a required word?
Negative phrase is the usual tool, because it blocks a theme in the order it appears without silencing every keyword containing those words. Negative broad is the closest structural mirror to BMM's word logic, but it blocks whenever all listed words appear anywhere, which makes accidental suppression of money keywords easy.
Or stop choosing between them.
AdFlint picks the setting, writes the ads, and keeps optimizing inside the Google and Meta accounts you already own.
Related comparisons
- Broad Match vs Phrase Match
- Broad Match vs Exact Match
- Broad Match vs Broad Match Modifier
- Broad Match vs Negative Keywords
- Broad Match vs Search Terms
- Exact Match vs Phrase Match
- Broad Match Modifier vs Phrase Match
- Negative Keywords vs Phrase Match