peartools

YouTube Thumbnail Previewer

See how your thumbnail looks across YouTube before you upload it. Add your image, type the video title and channel name, and watch it drop into the real YouTube layouts, sitting next to other videos in the desktop home grid, search results, the sidebar, and the mobile and tablet apps. Everything happens in your browser, so nothing is uploaded.

Drag and drop your thumbnail here, or

A 1280 × 720 (16:9) JPG or PNG works best. Up to 10 MB. Nothing is uploaded.

What a YouTube thumbnail previewer does

YouTube shows your thumbnail at many different sizes. It is large in a search result, medium in the home grid, and very small in the up next sidebar. A thumbnail that looks sharp at full size can turn into a blur when it is shrunk down, and text that reads fine on your screen can become impossible to make out.

This tool puts your thumbnail into each of those real placements at the right size, next to a title and channel name, and surrounds it with other real-looking videos so you can see whether it stands out in a busy feed. Add your video title, channel name, and logo so the preview matches what viewers see.

You can flip between the light and dark theme too, since a light or dark edge can blend into one of them. Spot the problems here and fix them in your editor before the video goes live.

Why use our YouTube thumbnail previewer

  • ·Free. No signup, no paywall, no watermarks.
  • ·Runs in your browser. Your thumbnail is never uploaded or saved.
  • ·Real placements. Search, sidebar, home grid, and mobile, all at true size.
  • ·Light and dark. Check both themes with one switch.
  • ·Size check. Warns you when your image is not the 16:9 shape YouTube uses.

How to use it

  1. 1

    Add your thumbnail

    Drag your thumbnail onto the box or click to pick a file. A 1280 by 720 JPG or PNG works best, since that is the size YouTube uses. It stays in your browser and is never uploaded.

  2. 2

    Type the title and channel

    Enter the video title and your channel name, and upload your channel logo if you like, so the previews match what viewers will actually see next to your thumbnail.

  3. 3

    Check every placement

    See your thumbnail sitting among other real-looking videos in the desktop home grid, search results, the up next sidebar, and the mobile and tablet apps. Add your title, channel name, and logo so it matches what viewers see. Switch between the light and dark theme to check both.

  4. 4

    Fix it before you upload

    If the subject or text is hard to read in the small spots, go back to your editor, make it bigger and clearer, then check again. No account needed.

Who previews YouTube thumbnails

Anyone getting a thumbnail ready for a YouTube video can use this. These are the people who use it most:

  • ·YouTube creators. Check that your thumbnail still reads at the small sizes YouTube shows it, so it earns clicks instead of getting lost in the feed.
  • ·Thumbnail designers. Show a client exactly how a design will look in search, the sidebar, and on a phone before it goes live, all in one view.
  • ·Video editors and teams. Compare a few thumbnail options against the real layout so the whole team can agree on the one that stands out.
  • ·Anyone posting a video. Uploading your first video? See how your thumbnail sits next to the title and channel name before you publish it.

Frequently asked questions

What size should a YouTube thumbnail be?
YouTube recommends 1280 by 720 pixels, which is a 16:9 shape, and the file should be under 2 MB. This tool shows your thumbnail at that shape across every spot on the site. If you add an image that is not 16:9, it warns you that YouTube will crop it.
Why does my thumbnail look different in the previews?
YouTube shows your thumbnail at many sizes, from a large search result down to a tiny sidebar suggestion. A design that looks great full size can turn into a blur when it is shrunk. Seeing it at each real size helps you catch text that is too small or a subject that gets lost.
Can I preview both the light and dark theme?
Yes. Use the dark theme switch to flip every preview between YouTube's light and dark mode. A thumbnail with a white or black edge can blend into one of them, so it is worth checking both.
Does this upload my thumbnail to YouTube?
No. This is only a preview. It does not connect to your YouTube account and does not publish anything. It just shows you how your image would look so you can decide before you upload it yourself.
Is my thumbnail private?
Yes. Everything happens in your browser. Your image is never uploaded to a server or saved anywhere, and once the page has loaded you can even use it offline.