How to A/B Test YouTube Thumbnails with Test & Compare

Guessing which thumbnail will perform best is hard, even for experienced creators. YouTube’s built-in Test & Compare feature lets you upload several thumbnails for one video and see which one viewers respond to.

Who can use it

Test & Compare is available in YouTube Studio on a computer for channels with access to advanced features. If you don’t see the option, check that your channel is verified and has advanced features enabled under Settings → Channel → Feature eligibility. YouTube rolls features out gradually, so availability can vary.

Setting up a test

1. Open YouTube Studio on a computer and go to Content.
2. Open the video’s Details page.
3. Under Thumbnail, choose Test & Compare.
4. Upload two or three thumbnails (1280 × 720 each).
5. Click Done and save.

YouTube then shows the versions to different viewers and reports the result in the video’s analytics. Tests usually run for days to a couple of weeks, depending on how many impressions the video gets.

How the winner is chosen

YouTube compares versions by watch time share — the share of total watch time each thumbnail generated. You’ll see one of three outcomes:

Designing thumbnails worth testing

A test only teaches you something if the versions are genuinely different. Change one big thing per version:

• Subject: your face vs. the product vs. the result.
• Text: a question vs. a number vs. no text at all.
• Colour: bright background vs. dark background.

Testing three nearly identical images usually ends with “None”. Before setting up a test, line up your options in our thumbnail preview tool to remove weak ideas early.

Reading the results honestly

• Don’t stop early. A version that leads after a day can easily lose later.
• One test is one data point. Look for patterns across several videos before changing your whole style.
• Keep notes. Save each set of thumbnails with the result. Over a few months you’ll learn what your audience prefers, which is more valuable than any single winner.

No access yet? Test manually

You can still compare thumbnails without the feature: change the thumbnail on an older video, wait at least a week, and compare Impressions click-through rate and average view duration in Analytics with the previous period. It’s less precise, because traffic changes over time, but it still reveals big differences. See how to change a YouTube thumbnail for the steps.