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SEO A/B testing: how to test a change without hurting your rankings

Google publishes rules for testing page variations. Follow them and a test does not cost you anything in search.

Author: HD5 min read

Table of contents
  1. Key takeaways
  2. Google's rules for tests
  3. Testing SEO changes
  4. That comparison is Proof
  5. See it on your own site
  6. Sources

Google's rules for tests#

  • Do not cloak. Showing Googlebot different URLs from people is against its spam policies, test or not.
  • If a test uses several URLs, put rel=canonical on the alternates pointing to the original.
  • If a test redirects visitors, use a 302, not a 301.
  • Run it only as long as needed.

Testing SEO changes#

Search traffic cannot be split per visitor, because Google sees one version. So change a group of pages and compare them with similar pages left alone, over the same weeks.

That comparison is Proof#

Each changed page is set against what the site normally gets.

See it on your own site#

The free website check reads a site you name and reports what holds its pages back, with no account and no card. It changes nothing on your site.

Run the free website check

Sources#

Before we change anything: the Nowlark baseline, in Search Console's own numbersA case study starts with the weeks before the change. These are the four weeks for nowlark.com, with no result claimed yet.Reading your dataHD4 min readOctober 16, 2026SEO competitor analysis: find who takes your searches, then whyYour search rivals are often not your business rivals. Start from the searches you want, not a list of names.Reading your dataHD5 min readOctober 16, 2026Keyword cannibalization: when two of your pages compete for one searchTwo pages answering the same search split the clicks between them. Search Console shows it if you know where to look.Reading your dataHD5 min readOctober 16, 2026