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Design Tool

Free YouTube Thumbnail Tester — Preview in Native Context

See exactly how your video will look on YouTube before you publish.

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youtube.com
Thumbnail 12:45

Your Video Title Goes Here

Channel Name • 10K views • 2 hours ago
FAQ

About Thumbnail Tester

What size should a YouTube thumbnail be?

1280×720 (16:9), under 2 MB, JPG/PNG. The tester scales your upload to every surface YouTube renders so you can spot details that vanish at 320px wide.

Why does my thumbnail look different in search vs. the homepage?

YouTube renders different sizes per surface — sidebar previews are ~120 px wide while the homepage is ~400 px. Text and faces that read at one size often disappear at another.

Should my thumbnail include the title text?

A short fragment can boost CTR 8–15% on educational content but distracts on entertainment content. Test both and pick what your specific audience clicks.

Is this a YouTube Studio replacement?

No — it’s a faster pre-flight. YouTube Studio only lets you preview after upload. This tester runs entirely client-side so you can iterate before committing.

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