The Complete Google SEO Algorithm Update History

Global spam release, expected to take a few days; still in its aftermath window as of August 21, 2026.

The last major market, after the regulatory delay; full AI Mode/AI Overviews launch committed by September 23, 2026 with publisher opt-out and neighboring-rights compensation.

Two-day global rollout across all languages. Google called it “a normal spam update” not aimed at link spam or site reputation abuse specifically, though observed impact was larger than recent spam updates.

First Search agents from I/O 2026 reached AI Ultra subscribers.

Search Console added a block-from-AI-features control; Google announced publishers can opt out of AI Mode and AI Overviews independently of regular Search rankings. The UK’s CMA ordered a rankings-preserving opt-out the same month.

Volatile 12-day rollout completing June 2, only about six weeks after the previous core update. Prioritized unique first-hand expertise over generic content; volatility peaks around May 23 and May 30.

AI Overviews and AI Mode merged into one seamless AI Search experience worldwide (desktop and mobile). Gemini 3.5 Flash became the default model globally. Search agents announced, starting with information agents that monitor topics in the background 24/7. AI Mode passed 1 billion monthly users. Google was explicit that AI Mode is still not the default search experience.

Biggest change since AI Overviews launched: inline citations placed next to the exact text they support, desktop hover previews with site names, a new “Expert Advice” block pulling first-hand perspectives from forums and review sites, subscription highlights, and in-depth article suggestions. Rolled out first on US-English searches.

User-chosen preferred publishers began influencing AI Overview citations, making audience loyalty a direct visibility signal.

12–13 day rollout ending April 8. Centered on “Information Gain” — rewarding pages that add genuinely new data, first-hand experience, or unique perspectives instead of rehashing what already ranks. Also tightened E-E-A-T author-credibility requirements and introduced holistic Core Web Vitals scoring (LCP, INP, CLS evaluated as a composite). Roughly a quarter of top-10 pages reshuffled when combined with the spam update.

Fastest spam update ever: completed in roughly 20 hours.

Widespread SERP instability reported by trackers ahead of the confirmed updates; never officially labeled.

First-ever core update specific to the Discover feed. Prioritized locally relevant content by country, reduced sensational/clickbait content, and boosted in-depth original content from topically expert sites. Completed February 27.

Follow-up questions directly from an AI Overview flow into AI Mode conversation; Gemini 3 became the global default model.

Third confirmed core update of 2025; 18-day rollout completing December 29. Around this time Google confirmed it also ships smaller, unannounced core updates on an ongoing basis.

Followed by the broader European rollout in October (France excluded over the press neighboring-rights standoff).

Google killed the URL parameter SEO tools used to pull 100 results at once, disrupting rank tracking industry-wide (infrastructure change, not a ranking update).

More conversational image and shopping search.

Long spam rollout, fully complete September 21.

“AI Mode” and “AI Overviews” added as separate Search Appearance segments, letting site owners track AI impressions and clicks.

First market outside the US.

16-day rollout. Debuted MUVERA, a multi-vector retrieval system improving how Google connects query intent to relevant results. Rewarded structure, semantic depth, and strong E-E-A-T.

Full conversational search experience at I/O 2025; AI Overviews expanded to 200+ countries and 40+ languages, with Gemini 2.5 powering US results.

Austria, Belgium, Germany, Ireland, Italy, Poland, Portugal, Spain, Switzerland (signed-in adults only, for regulatory reasons).

First core update of the year (~2-week rollout). Continued recovery window for some previously HCU-hit sites.

US AI Overviews upgraded to Gemini 2.0, expanding to complex queries (coding, math, multimodal). AI Mode debuted as a Labs experiment.

Year-end spam release, completed Dec 26.

Launched just a week after the November rollout finished; only six days long but high-impact.

Broad core update, ~2-week rollout.

Extended to 100+ countries.

Incorporated feedback from HCU-hit sites; some genuine recoveries began appearing.

Rolled out to the UK, India, Japan, Brazil, Mexico, and Indonesia with multi-language support.

One-week global spam release.

Manual actions began against parasite-SEO content on major publishers.

SGE rebranded and launched to all US users at I/O 2024. Immediate CTR impact on informational queries.

Massive 45-day combined rollout. Helpful Content system integrated directly into the core algorithm, and three new spam policies introduced: scaled content abuse, site reputation abuse (“parasite SEO”), and expired domain abuse. Google targeted a 40–45% reduction in low-quality, unoriginal content.

Final announced reviews update; the reviews system moved to continuous, unannounced updating afterward.

Second core update in under a month, affecting a different core system.

Overlapped the spam update, compounding volatility.

Targeted cloaking, hacked, auto-generated, and scraped spam across many languages.

One of the most damaging HCU rollouts ever; many small publishers and niche sites lost most of their traffic and struggled to recover.

Broad core update.

AI-generated answers unveiled at I/O 2023 as a Labs experiment; the prototype for everything that followed.

Reviews system broadened beyond products to services, media, destinations, and more.

13-day rollout; MozCast peaked at 108.7° with six days above 100°.

Expanded reviews signals to more languages.

Deployed SpamBrain AI to neutralize both spammy links and sites built to pass links.

Extended the helpful content system to all languages.

Global spam-detection improvement.

Fifth reviews release, overlapping the core update.

Broad core update.

New sitewide classifier demoting content created for search engines rather than people. English-language, initially mild.

Fourth reviews release.

Broad core update with heavy volatility.

Third reviews release.

Core Web Vitals signals extended to desktop rankings.

Second reviews release.

Broad core update landing just before Black Friday.

Biggest local shake-up in years: heavily reweighted proximity and cracked down on keyword-stuffed Google Business Profile names.

Google began rewriting page titles in SERPs far more aggressively.

Massive mobile and desktop volatility, possibly related to link-spam follow-through.

Better identification and nullification of link spam across languages.

Second half of the June/July pair.

Two fast global spam-fighting releases, each completing in about a day.

First half of a two-part core release.

Gradual rollout making Core Web Vitals (LCP, FID, CLS), mobile-friendliness, HTTPS, and no intrusive interstitials ranking signals on mobile.

First of the reviews series; rewarded in-depth, first-hand product reviews over thin summaries (English only).

Many sites lost featured snippets (heaviest on YMYL and short queries); most returned by March 11.

Google began ranking individual passages of pages for specific queries (~7% of English queries).

Trackers lit up; Google denied an update amid widespread DNS/Webmaster Tools errors.

Very large broad core update to close the year.

Separate mobile-indexing and canonicalization bugs affected roughly 0.5% of the index for weeks.

Massive one-day ranking chaos that Google attributed to an indexing system bug, later fixed.

One of the largest core updates measured to that point; big swings during COVID-era search behavior shifts.

Very high flux; Google said it was not a core update, and some changes reversed days later.

Pages in a featured snippet no longer repeated in organic listings; ~100% of snippet SERPs affected instantly.

Broad core update, again heavier on YMYL niches.

Significant flux affecting some verticals; Google declined to confirm.

Introduced neural matching to local rankings, matching businesses to queries conceptually rather than by exact keywords.

Neural network for natural language understanding, applied to ~10% of English queries and featured snippets. Biggest leap since RankBrain.

Broad core update, milder impact than March or June.

Weekend volatility spike; never confirmed.

Limited most SERPs to no more than two results from the same domain.

First pre-announced core update. Notable damage to some large publishers.

Technical incident (not an algorithm change) that dropped ~4% of stable URLs from the index.

First core update under Google’s new naming convention. Broad, with partial reversals of previous core-update losses.

Ongoing unconfirmed movement through the fall.

Confirmed smaller core update on Google’s 20th birthday, seen by some as a partial Medic reversal.

Massive broad core update disproportionately hitting health, medical, and YMYL sites. Kicked off the modern E-A-T era.

Heavy fluctuations across trackers.

Page speed became a ranking factor for mobile searches; affected only the slowest sites.

Dedicated video carousel replaced video thumbnails; plus an unconfirmed volatility spike the same day.

Meta description display reverted to ~155–160 characters.

Confirmed broad core quality update.

Google began migrating sites to mobile-first indexing at scale.

Google confirmed a broad core update; community named it Brackets.

Pre-holiday update affecting sites targeting many keyword permutations; Google acknowledged only “several minor improvements.”

Snippets extended to ~300 characters (later reversed in May 2018).

Sharp decline in featured snippets alongside knowledge panel expansion.

A sustained period of high volatility across multiple trackers.

Heavy weekend flux.

Another quality-signal shake-up detected by trackers.

Targeted fake news, offensive/misleading content, and problematic search suggestions.

Widely felt update hitting low-value, ad-heavy, revenue-first content sites. Gary Illyes jokingly named it “Fred”; Google never officially confirmed details.

A week of sustained changes; case studies pointed to a significant core-quality ranking adjustment.

Punished aggressive pop-ups/interstitials on mobile. Pre-announced five months earlier; real-world impact modest.

Rare 109° MozCast reading; never confirmed.

Two large volatility spikes, possibly related to mobile-first indexing testing.

Near-record MozCast temperature (111°) and a 50% drop in SERPs showing image results.

Penguin became real-time and part of the core algorithm. Phase 1 rolled out the “gentler” algorithm that devalues (rather than penalizes) bad links; Phase 2 reversed historical Penguin penalties.

Major local update. Filtered listings sharing addresses/ownership, diversified the local pack, boosted businesses outside city limits, and made searcher proximity a stronger factor.

Strengthened the mobile-friendly ranking signal.

Multi-day flux; Google denied a Penguin connection.

Right-column ads removed; 4 ads on top for commercial queries. Big implications for organic CTR.

Historically large movement; Google confirmed a core update (not Penguin) and confirmed Panda was now part of core.

Another unconfirmed quality shake-up.

Machine-learning system for interpreting queries, running since roughly spring 2015. Google called it the third most important ranking signal.

Local pack cut from 7 results to 3.

Final named Panda refresh (~2–3% of queries), rolled out over several months. Panda was then absorbed into the core algorithm (confirmed Jan 2016).

Initially denied, later confirmed as a change to how quality signals are assessed. Hit thin content, clickbait, and pages with heavy ads.

Mobile-friendliness became a ranking factor on mobile searches. Pre-announced; impact was slower and milder than the hype.

Significant flux; speculation ranged from e-commerce targeting to mobile-usability testing.

Google said Penguin had shifted to continuous, gradual updating.

Second DMCA update; crushed torrent and piracy sites.

After a year’s wait, a refresh (not a new algorithm); smaller than expected (~1% of queries) with an unusually long, drawn-out rollout.

Refresh helping small/medium sites with high-quality content (~3–5% of queries).

Google ended the Authorship program entirely.

HTTPS became a lightweight ranking signal.

Landmark local update: tied local results to core web ranking signals, tightened result radius, improved distance/location parameters. US launch; expanded to UK, Canada, and Australia on Dec 22.

Author photos removed from SERPs.

Focused on spammy queries rather than spammy sites.

Major Panda algorithm update (not just a refresh); ~7.5% of English queries. Press-release sites hit hard.

Next generation targeting spammy queries.

Refresh of the top-heavy ads algorithm.

Roughly 15% drop in rich authorship snippets, beginning the wind-down of Google Authorship.

Data refresh (~1% of queries), noticeably painful for many sites.

Complete rewrite of the core algorithm (announced Sep 26) enabling semantic, conversational search. Affected ~90% of queries.

New SERP block for long-form evergreen content.

Large weekend fluctuations; never confirmed.

KG answers jumped from ~17% to ~26% of queries in a single day.

A “softer” Panda refresh that eased some earlier penalties.

Roughly a month of severe turbulence (mid-June through early July), the highest MozCast readings recorded up to that point; suspected spam-algorithm testing.

Targeted heavily spammed niches (payday loans, adult, pharma).

Matt Cutts confirmed Panda was now updating monthly over ~10-day rollouts, causing recurring flux.

Fourth Penguin release; deeper page-level analysis beyond the homepage (~2.3% of queries).

Significant unexplained traffic losses reported across many sites; the first of the “Phantom” quality updates.

Final standalone Panda refresh before integration into the core algorithm’s rolling updates.

Refresh (~1.2% of queries).

Slightly larger refresh (~1.3% of queries).

Rolled out to more languages.

Data refresh.

Refresh (~1.1% of US queries).

Refresh of the top-heavy ads penalty.

Minor data refresh (~0.3% of queries).

Major refresh (2.4% of queries) overlapping with EMD; numbering switched from decimals.

Devalued low-quality sites relying on exact-match domain names.

Minor refresh.

Minor refresh.

About 18% of first pages dropped to seven organic results.

Sites with high volumes of valid copyright-removal notices demoted.

Refresh; rankings fluctuated for nearly a week.

Data-only refresh.

Refresh with reportedly higher impact than previous versions.

First Penguin data refresh.

Entity-based information panels launched.

Minor refresh.

The landmark webspam update. Punished manipulative link profiles and keyword stuffing; hit ~3.1% of English queries.

Data refresh.

Anchor-text “scoring turndown,” image search quality changes, navigational query tweaks.

Refresh; ~1.6% of queries affected.

Landmark local update: localized organic results based on user location, even without geo-modified queries.

Refresh alongside a 40-pack of smaller changes (link evaluation changes, local signal improvements).

Penalized pages with excessive ads above the fold.

Data refresh.

Aggressive personalization with Google+ data.

Monthly batch: image search landing-page quality, sitelinks improvements, richer snippets.

Google began publishing monthly lists of smaller changes (related-query improvements, parked-domain detection, image freshness, and more).

Minor refresh.

Rewarded recent content for time-sensitive queries; impacted ~35% of searches.

Matt Cutts warned of ongoing Panda flux; several small data refreshes.

Logged-in searches encrypted, birth of “(not provided)” keyword data.

Refresh with notable winners/losers reshuffling.

rel=”next”/rel=”prev” support for paginated content.

Full-width sitelinks for brand queries.

Panda expanded to most non-English languages.

Minor refresh.

Minor refresh; improved scraper detection.

Minor refresh.

Extended Panda to all English-language queries worldwide; incorporated searcher blocking data.

The landmark content-quality update. Hit content farms, thin content, and high-ad-ratio pages; affected ~12% of US queries.

Improved detection of original content vs scrapers, ahead of Panda.

After the DecorMyEyes exposé, Google adjusted the algorithm so notoriety from bad reviews couldn’t boost rankings.

Google confirmed it used social signals (including Twitter/Facebook data) in ranking.

Magnifying-glass page previews in SERPs; signaled emphasis on page design quality.

Results loaded as you typed. Minimal ranking impact, big UX change.

Allowed the same domain to occupy multiple listings for brand-type queries.

Full launch of the new indexing system: 50% fresher results and massive crawl capacity.

Targeted thin content ranking for long-tail queries; a precursor to Panda.

Local Business Center rebranded to Places, tighter integration with local results.

Twitter feeds, news, and fresh content began appearing in real time.

Google opened developer preview of its new indexing infrastructure.

Support for the canonical tag to consolidate duplicate URLs.

Big brands received a noticeable ranking boost for competitive short-tail keywords. Matt Cutts called it a “minor change.”

Autocomplete suggestions in the search box, changing query behavior.

Large-scale shuffle suspected to involve internal properties; Matt Cutts asked for examples but nothing was confirmed.

An accumulation of smaller changes causing single-word query shuffles; named in honor of departing Googler Vanessa Fox.

Blended news, video, images, and local results into the traditional 10 blue links.

Reported ranking shuffles in December; never confirmed.

Changes to how supplemental-index pages were filtered.

Infrastructure overhaul (completed March 2006) improving URL canonicalization, redirects, and crawling.

Three-phase rollout targeting low-quality links: reciprocal link schemes, link farms, and paid links.

Local Business Center data merged into Maps, foundational for local SEO.

Reported flux that Google said was just a routine data refresh.

Search history began influencing results for logged-in users.

Webmasters could now submit sitemaps directly, influencing crawling.

Appeared to change treatment of duplicate content and non-canonical (www vs non-www) URLs.

Suspected changes to how suspicious links and duplicate content were handled; possible early sandbox effects.

Google, Yahoo, and Microsoft jointly introduced the rel=”nofollow” attribute to combat comment spam.

Introduced Latent Semantic Indexing (synonym awareness), link neighborhoods, and increased attention to anchor text relevance.

Follow-up to Florida; targeted invisible text, meta-tag stuffing, and FFA (free-for-all) link pages.

The first truly devastating update. Wiped out keyword-stuffed and over-optimized sites right before the holiday shopping season.

Split off a secondary index for lower-value pages.

Completed the shift to daily incremental index updates (“everflux”) instead of monthly refreshes.

Last of the monthly Google Dance updates; infrastructure changes toward continuous updating.

Changed how backlinks were counted and reported.

Cracked down on hidden text, hidden links, and linking between co-owned domains.

First named update, announced at SES Boston. Began the era of monthly “Google Dance” updates.

Google’s first publicly acknowledged algorithm change; major shuffling of results with no name attached.