Free · browser-based · local image processing

See your thumbnail where viewers will find it.

Load a local image and title, then compare them across six illustrative YouTube layouts before you publish. Already have a public video link? Find its available thumbnail sizes first.

No account
Nothing uploaded
Export any layout as PNG

01 — Your video

Add the thumbnail and title

Drop your thumbnail here or click to browse, or paste from clipboard (Ctrl/Cmd+V) JPG, PNG, WebP or GIF · up to 10 MB · 1280×720 recommended

Have a public YouTube video URL? Download an available thumbnail, then return here to preview it.

Version B for comparison (optional) Use this to view two thumbnail versions side by side. Images stay in your browser. Video title

Channel name Views Duration Publish age

02 — Your preview

Compare six placements

A quick visual review

From image to a clearer pre-publish decision.

Use the tool for a concrete visual check, then keep the exported preview with the video project.

01
Load the real thumbnail
Drop in the image and add the title you plan to publish with.
02
Compare the placements
Switch between Home feed, Search, Watch page, Shorts, Mobile and Sidebar.
03
Export the review
Save a PNG of the layout you checked before publishing the video.

Learn by checking

Two short guides for your next review.

Illustrative MyThumbTester Home feed preview

Visual checklist

A practical YouTube thumbnail check before you publish

Use a six-layout review instead of judging the image in isolation.

Read guide →

Tool boundary

What a thumbnail preview can and cannot tell you

Check visual clarity without treating a mockup as a performance forecast.

Read guide →

These are illustrative layout previews, not a live YouTube interface or a prediction of clicks. Actual layouts can vary by device and change over time. GIF files are rendered as a still preview; downloads are PNG images.

Supported formats and limits

Input formats: JPG, PNG, WebP, GIF. Anything else is rejected with an error message.
Maximum file size: 10 MB. Larger files are rejected before they are read.
Recommended size: 1280×720 (16:9). Other sizes are accepted and cropped to 16:9 to match how YouTube renders them.
Placements covered: home feed, search results, watch page, Shorts, mobile feed, sidebar — six layouts, each downloadable as PNG.
No account, no upload. Everything runs in this browser tab. Your image never leaves this machine.

How to use this thumbnail tester

Drop in your thumbnail, or paste it from the clipboard.
Type the title you plan to publish with, plus channel name, views, duration and publish age if you want the card filled in.
Switch between the six placements to see how it holds up where viewers will actually see it.
Hit Download PNG to save the placement you are looking at.

FAQ

What is a thumbnail tester?

A youtube thumbnail tester renders your image and title inside the layouts YouTube actually uses, so you can check cropping, text size and contrast before you publish instead of after.

Is this yt thumbnail tester free?

Yes. No signup, no upload, no watermark. It runs entirely in your browser.

Can I test the thumbnail and title together?

Yes. This youtube thumbnail and title tester draws the title next to the image in every placement, because a thumbnail rarely fails on its own — it usually fails by repeating what the title already says.

Does it score my thumbnail?

No. It shows you what viewers will see. Judging it is your call.