A match type is the setting attached to every keyword in a search advertising campaign that decides which user queries that keyword is allowed to bid on. The keyword "running shoes" can be told to compete only for searches that mean the same thing, for searches that contain its meaning, or for anything the platform judges related. Match types exist because advertisers buy words, while users type an almost unlimited variety of queries. The match type sets how loosely one is translated into the other.

On Google Ads and Microsoft Advertising, three positive match types survive as of October 2026: broad, phrase and exact. Each has a negative counterpart used to block queries. A fourth category, AI Max for Search, is described as a feature but behaves like a match type.

How matching works

The match type is written into the keyword itself. A keyword typed plainly is broad match, which is the default. Quotation marks around it ("tennis shoes") make it phrase match. Square brackets ([red shoe]) make it exact match. Microsoft Advertising uses the same punctuation, according to its scripting documentation.

According to Google's help page on keyword matching options, exact match lets ads appear on searches with "the same meaning or same intent as the keyword", phrase match on searches that "include the meaning" of the keyword, and broad match on searches "related to" it. Broader types capture every query the narrower ones would, plus more.

The literal reading of those labels stopped applying years ago. Every match type now includes close variants: misspellings, plurals, stems, abbreviations, reordered words and, since 2018, paraphrases and implied words. Google's own example is the exact match keyword [yosemite camping], which can serve on "yosemite campground" and "campsites in yosemite" but not on "yosemite hotel", where the intent differs.

Broad match draws on more inputs than the other two. According to Google, it may weigh the user's recent search activity, the content of the landing page and assets, and the other keywords in the same ad group. Google describes Smart Bidding, its automated auction-time bidding, as critical when broad match is used, because each query's bid should reflect signals available only at the moment of the search.

When several keywords in an account qualify for the same query, a hierarchy decides which one enters the auction. As summarised in PPC Land's keyword explainer, Google ranks an identical exact match first, then phrase and broad match (including AI Max) together, then an AI-based relevance ranking across ad groups, with Ad Rank breaking ties. Microsoft Advertising's liaison Navah Hopkins described the equivalent rule on December 18, 2025: "Exact match will get the priority if it's there, otherwise Ad Rank determines everything."

Negative match types work differently and more literally. A negative broad keyword blocks a query only when all its words appear, in any order. Negative phrase blocks the words in sequence; negative exact blocks only the identical query. Crucially, according to Google, negatives do not expand to close variants: a negative broad keyword "flowers" blocks "red flowers" but not "red flower". Plurals and synonyms have to be listed separately. Google raised the Performance Max negative keyword cap from 100 to 10,000 in March 2025 after Ginny Marvin, its Ads Product Liaison, acknowledged that "the cap of 100 felt too restrictive". Brand exclusions are a newer layer that blocks searches by brand entity rather than by string.

Origin and evolution

Paid search began as a literal auction on words. GoTo.com launched its pay-per-click keyword auction in February 1998, and Google's AdWords Select brought per-click pricing to Google in February 2002. Broad, phrase, exact and negative matching became the standard toolkit, and for years exact match meant precisely that.

In July 2010 Google added a fourth option, the broad match modifier (BMM). Placing a plus sign before a word ("+formal +shoes") required that word, or a close variant, to appear in the query. According to Google's agency blog post of July 14, 2010, it offered "wider reach than phrase match" with more control than plain broad match.

The erosion of literal matching followed in steps. On August 15, 2014, Google said close variant matching, until then optional, would apply to all exact and phrase keywords from late September 2014. Reordered words and function words were folded into exact match in 2017. On September 6, 2018, Google extended exact match close variants to same-meaning queries, citing internal tests showing about 3% more exact match clicks and conversions.

Then the modifier itself disappeared. On February 4, 2021, Google announced that phrase match would absorb BMM behaviour, starting on February 18, 2021 in eight languages including English, German and French, and completing in July 2021, after which new BMM keywords could no longer be created. Microsoft Advertising followed from mid-May 2021 in the US and Canada and, according to Search Engine Land, blocked new BMM keywords from August 2021. On March 15, 2023, Microsoft went further, serving remaining BMM keywords as broad rather than phrase match, according to MediaPost.

In September 2020, Google began limiting the search terms report to queries searched by "a significant number of users", a threshold it never defined.

AI Max and the keywordless turn

The current phase began on May 6, 2025, when Google announced AI Max for Search campaigns, a suite whose core component, search term matching, combines broad match expansion with keywordless targeting. Google started reporting AI Max as a distinct match type on July 2, 2025, and the Google Ads API lists AI_MAX alongside BROAD, PHRASE and EXACT.

Google's case for broad match rests largely on its own numbers. Documentation published in August 2025 cited internal July 2021 data showing that switching exact match keywords to broad yielded 35% more conversions under target cost per acquisition (CPA) bidding.

AI Max left beta on April 15, 2026, with Google claiming an average 7% more conversions or conversion value at similar CPA or return on ad spend (ROAS), down from the 14% it cited in May 2025. Google blocked creation of the campaign-level broad match setting on August 3, 2026 and, after an email to advertisers on August 5, began converting those campaigns to AI Max through September 2026. Dynamic Search Ads follow in February 2027.

Microsoft has moved in parallel. It folded Predictive Matching into AI Max search term matching in July 2026, giving no effective date, and began rolling out AI Max to all accounts globally on August 19, 2026.

Why it matters

The match type is the main lever an advertiser holds over which searches are bought. The single-keyword ad group, a structure built on near-literal exact match, became far less viable once same-meaning close variants arrived in 2018.

The shift also moves interpretive power from advertiser to platform. When exact match follows "intent" rather than words, the platform decides what the intent is, and the platform is also the seller of the inventory.

Limitations and disputes

Independent measurements diverge from Google's claims. Brian Lasonde of PPC Boost documented in November 2025 an exact keyword, "best hypoallergenic food for dogs", matching 13 queries none of which contained "hypoallergenic". Mike Ryan of Smarter Ecommerce found, across 383 million EMEA ecommerce impressions, that nearly 29% of exact match impressions had been broadened by AI Max by July 2026, up from zero in January 2025. Earlier, an analysis of more than 250 retail campaigns put AI Max conversions at about 35% lower ROAS than traditional match types. Google maintains that the suite drives incremental conversions; neither side's figures have been independently audited.

Reporting compounds the problem. Brad Geddes of Adalysis found AI Max traffic attributed to exact and phrase keywords when no broad version existed, while Marvin said Google is "increasingly determining relevance by inferred intent". By May 2026, Google documentation stated that the search term shown in reporting "represents the best approximation of the user's intent" for AI Mode and Lens queries, rather than what was typed. Because negatives work on strings, blocking a reported approximation may not block the underlying query.

Trust is a recurring theme. In December 2024, Navah Hopkins, then at Optmyzr, reported that switching to conversion-based bidding was toggling broad match on without notice; Marvin called it "not the expected behavior".

Not the same as

Keyword. The keyword is the word or phrase an advertiser bids on; the match type is the rule governing how far that keyword can stretch. PPC Land's keyword explainer covers the bidding unit itself.

Search term. The search term, or query, is what the user actually typed or spoke. Match types connect keywords to search terms, and the search terms report shows the result, increasingly as approximations.

Customer Match and audience matching. Customer Match uploads hashed first-party data such as email addresses to target known users. It matches people, not queries, and has no relation to keyword match types despite the shared word.

Search themes. Performance Max uses search themes as signals, not as keywords with match types. According to PPC Land's round-up of 2025 Performance Max changes, search terms reporting there separates keywordless matches from theme-driven ones.

Recent developments

The direction is not entirely one-way. On September 4, 2026, Marvin confirmed a "small experiment" letting exact and phrase keywords serve ads in AI Mode, previously reachable only through AI Max, Performance Max or broad match with Smart Bidding. Google also began rolling out a branded search control inside AI Max in late May 2026, letting advertisers restrict it to unbranded queries. As of October 2026, broad, phrase and exact remain available on both platforms, while Google's campaign-level broad match setting has been absorbed into AI Max.

Timeline

  • February 1998: GoTo.com launches its pay-per-click keyword auction.
  • February 2002: Google introduces per-click pricing with AdWords Select.
  • July 14, 2010: Google rolls out the broad match modifier.
  • August 15, 2014: Google announces mandatory close variants for exact and phrase match from late September 2014.
  • 2017: Word order and function words added to exact match close variants.
  • September 6, 2018: Google extends exact match to same-meaning queries.
  • September 2020: Google limits the search terms report to terms searched by a "significant number of users".
  • February 4, 2021: Google announces phrase match will absorb broad match modifier behaviour.
  • July 2021: Google stops creation of new BMM keywords.
  • August 2021: Microsoft Advertising stops creation of new BMM keywords.
  • March 15, 2023: Microsoft begins serving BMM keywords as broad match.
  • March 2025: Google raises the Performance Max negative keyword limit to 10,000.
  • May 6, 2025: Google announces AI Max for Search campaigns.
  • July 2, 2025: Google begins reporting AI Max as a distinct match type.
  • December 18, 2025: Microsoft clarifies exact match priority over Performance Max.
  • April 15, 2026: AI Max exits beta.
  • July 2026: Microsoft folds Predictive Matching into AI Max.
  • August 3, 2026: Google blocks creation of the campaign-level broad match setting.
  • August 19, 2026: Microsoft rolls out AI Max to all accounts globally.
  • September 1, 2026: Google begins migrating broad match setting campaigns to AI Max.
  • September 4, 2026: Google confirms a test of exact and phrase keywords serving in AI Mode.
  • February 2027: Scheduled Dynamic Search Ads automigration to AI Max.

Summary

Who. Search platforms define match types, chiefly Google Ads and Microsoft Advertising. Advertisers and agencies choose them for each keyword, and platform automation such as Smart Bidding and AI Max increasingly decides how far they stretch.

What. A keyword setting that controls how closely a user's query must resemble a keyword before an ad can compete. The current types are broad, phrase and exact, each with a negative counterpart, alongside AI Max search term matching.

When. Literal matching dates from the early paid search auctions of 1998 to 2002. Close variants arrived in 2014 and expanded in 2017 and 2018, the broad match modifier ran from 2010 to 2021, and AI Max launched in May 2025 and absorbed Google's broad match setting from September 2026.

Where. Inside Search campaigns on Google Ads and Microsoft Advertising, with related controls in Performance Max, and in reporting surfaces such as the search terms report.

Why. Match types determine which searches an advertiser pays for. Their gradual loosening, combined with reduced query visibility, has shifted control over that decision from advertisers to the platforms that sell the inventory, and remains one of the most contested issues in search advertising.