
Key takeaways
- Matt Cutts announced on Twitter on 20 May 2014 that Panda 4.0 was rolling out that day.
- Google told Search Engine Land it affected about 7.5% of English queries noticeably.
- It was a new version of the algorithm, not one of Panda's routine monthly data refreshes.
- Google said it would be gentler for some sites and lay groundwork for future changes.
- Google's ranking systems guide says Panda became part of its core ranking systems in 2015.
What Google changed
On 20 May 2014, Matt Cutts, then head of Google’s webspam team, posted on Twitter: “Google is rolling out our Panda 4.0 update starting today.” Panda was Google’s algorithm for keeping sites with low-quality content out of top results, launched in February 2011.
By 2014, Panda ran as routine monthly refreshes that Google no longer announced. Panda 4.0 was different. Search Engine Land reported it as a change to how Panda identifies sites, not just a data refresh. From talking to Google, it said the update would “be gentler for some sites, and lay the groundwork for future changes in that direction.”
The name came from Google. Search Engine Land, which had numbered Panda releases in sequence, wrote that “4.0 is how Google named this specific update.”
When it rolled out
Cutts’s post dates the start to 20 May 2014. Search Engine Roundtable reported the next day that it “began rolling out yesterday.” Google stated no completion date.
What is known about its impact
Google’s figure came through Search Engine Land: Panda 4.0 “affects different languages to different degrees,” and in English about 7.5% of queries were affected “to a degree that a regular user might notice.” Google gave no site-level figures. Treat any list of winners and losers as a third-party estimate.
What site owners should do
Panda no longer exists as a separate system. Google’s ranking systems guide lists it under retired systems and says it “evolved and became part of our core ranking systems in 2015.” Google’s current helpful content guidance carries the same tests:
- Check whether content provides original information, reporting, research or analysis.
- Check whether it gives a substantial, complete description of the topic, not a thin page.
- Avoid simply copying or rewriting other sources without adding substantial value.
How to check whether it affected you
This is historical. Search Console keeps 16 months of data, so May 2014 can only be checked in archived analytics, by comparing Google organic traffic before and after 20 May 2014. Google also confirmed an update for spammy queries the weekend before, so check which pages moved. The Google Algorithm Updates timeline lists every update with its dates.
Related updates
- Panda 2.0 in April 2011 took Panda to all English searches.
- Panda 4.1 followed in September 2014.
- The payday loan update of 2013 was Google’s earlier algorithm for spammy queries.
The evidence
- Type
- content quality update
- Started
- 20 May 2014
- Completed
- Not stated by Google
- Confirmed by
- Google statement
Sources
- 1.Matt Cutts on Panda 4.0 (post on X) - Matt Cutts (Google), May 20, 2014Primary
- 2.Google Begins Rolling Out Panda 4.0 Now - Search Engine Land, May 20, 2014
- 3.Google Panda 4.0 Unleashed: 7.5% Queries Impacted & May Be Softer - Search Engine Roundtable, May 21, 2014
- 4.A guide to Google Search ranking systems - Google Search CentralPrimary
- 5.Creating helpful, reliable, people-first content - Google Search CentralPrimary
Frequently asked questions
When did Panda 4.0 roll out?
Matt Cutts posted on Twitter on 20 May 2014 that Google was rolling out Panda 4.0 starting that day. Google did not announce when the rollout finished.
Did Google name it Panda 4.0?
Yes. Search Engine Land noted that it numbered earlier Panda releases itself, but that 4.0 was how Google named this specific update.
How many queries did Panda 4.0 affect?
Google told Search Engine Land that Panda 4.0 affected different languages to different degrees, and about 7.5% of English queries to a degree a regular user might notice.
Was Panda 4.0 related to the spam update the weekend before?
No. Search Engine Roundtable reported that Panda 4.0 was unrelated to the spam algorithm update for spammy queries that Google had confirmed over the preceding weekend.
About the author

Founder, UpgradIQ FZC LLC
Adam Hafez works on technical SEO and search measurement: how pages get crawled, indexed, ranked and now quoted by answer engines. He founded UpgradIQ, which reads Google Search Console and GA4 to tie ranking movement back to the changes that caused it. He publishes what the data supports and states the limits of it.
- Technical SEO
- Search Console and GA4 measurement
- Answer engine optimization
- Structured data
The briefing
Only what actually changed in search, delivered in full by RSS, Atom or JSON feed.
FollowRelated reading
Panda 4.2 (2015): the slow Panda refresh and what it means now
Google confirmed a Panda refresh in July 2015 that hit 2% to 3% of English queries and took months to roll out. It was the last numbered Panda.
Panda update (2011): what it changed and what it means now
Google's Panda update of 24 February 2011 cut rankings for low-quality sites and noticeably affected 11.8% of queries. It is now in core ranking.
May 2015 quality update: what changed and what it means now
In May 2015 Google confirmed a change to how its core algorithm processes quality signals. The industry called it the Quality update, or Phantom 2.
RankBrain (2015): what Google's first AI ranking system does
Google disclosed RankBrain on 26 October 2015 as a machine-learning system for interpreting searches. It is still one of Google's ranking systems today.



