YouTube Thumbnail Preview Tester

See how your thumbnail and title will look on YouTube before you publish. Free, and your images never leave your browser.

Thumbnail A

Upload or drop an imageJPG, PNG, GIF or WebP · stays on your device

Thumbnail B (optional, to compare)

Upload or drop an imageJPG, PNG, GIF or WebP · stays on your device

Channel name A

Channel name B

Views

Uploaded

Video length

Loading a link fills in the thumbnail, title and channel name. Views, upload time and video length are for the preview only, so type any values you like.

Theme

Grayscale test Blur test

These previews are approximations of YouTube's layouts and do not predict clicks. Your images stay in your browser and are never uploaded.

Related Tools

YouTube Video Thumbnail Downloader

YouTube Title Generator

YouTube Title Analyzer

YouTube Video Upload Time Checker

User Guide — YouTube Thumbnail Preview Tester

What Is This Tool?

The YouTube Thumbnail Preview Tester shows how your thumbnail and title will appear to viewers before you publish. It mocks up the home feed, the mobile feed, search results and the suggested videos sidebar, in light and dark mode, so you can catch unreadable text, cut-off titles and covered faces early.

How to Use — Step by Step

1

Add your thumbnailUpload an image, or paste a YouTube link to load a video's thumbnail, title and channel name.

2

Type your titleAdd the title, channel name and video length. The preview updates as you type.

3

Switch previewsUse the tabs for home feed, mobile, search, sidebar and tiny sizes, and flip between light and dark theme.

4

Compare if you likeAdd a second thumbnail in the B box to see both versions side by side.

What to Check

Readability at small size: open Tiny sizes. If the text cannot be read, make it larger or use fewer words.
Contrast: turn on Grayscale. If the main subject or text blends into the background, increase the contrast.
The duration badge: it sits in the bottom-right corner, so keep text and faces away from it.
Dark and light mode: check both. A dark edge can vanish in dark mode and a white edge in light mode.
Title length: the counter under the title field shows when a title is likely to be cut off. Put the key words first.
Title and thumbnail together: they should add to each other, not repeat the same words.

Troubleshooting

"Could not read that image"

Use a JPG, PNG, GIF or WebP file under 15 MB. Some very large or unusual files may fail to load.

The link did not load a thumbnail or title

Check that the link is a full YouTube video link. Private or removed videos cannot be loaded, and the title may not load for videos whose owner has turned off embedding. In that case, type the title yourself.

The image looks cropped

Thumbnails should be 16:9. An image with another shape is cropped in the preview, and the note under the upload box tells you when the ratio is not 16:9.

Frequently Asked Questions

It is a free tool that shows how your thumbnail and title will look on YouTube before you publish. It previews the home feed, mobile feed, search results and the suggested videos sidebar, in light and dark mode.

Upload your thumbnail, or paste a YouTube link to load a video's thumbnail, title and channel name. Add or edit them, then choose a preview tab. The preview updates as you type, and you can switch between light and dark mode.

No. An image you upload stays in your browser and is never sent to our server, so your unpublished thumbnails remain private. If you paste a YouTube link, only that link is sent, so the tool can look up the title and channel name.

YouTube recommends 1280 by 720 pixels with a 16:9 ratio, and at least 640 pixels wide. Check YouTube Help for the current file size limit before you upload.

Yes. Add a second thumbnail in the Thumbnail B box, with its own title if you like, and every preview shows both versions side by side. You can also load a competitor's thumbnail, title and channel name by pasting a YouTube link.

Most viewers see thumbnails at small sizes, in either light or dark mode. Text that looks clear at full size can become unreadable, and a dark edge can disappear on a dark background. The tiny size, grayscale and blur checks help you spot these problems.

No. It only shows how your thumbnail and title will look and helps you catch readability problems. To test which version performs better with real viewers, use YouTube Studio's own thumbnail testing.

They are close approximations. YouTube changes its layout from time to time and varies it by device, so use the previews to check readability and cropping rather than exact positions.

Yes, it is completely free with no sign-up and no limit on how many thumbnails you test.