YouTube Thumbnail Preview Tool: see your thumbnail and title on YouTube before you upload

Drop in your thumbnail, type your title, and see how they look on the YouTube home feed, in search, in the suggested sidebar and on a phone, in dark and light mode. It also checks the size, the 16:9 shape, the 100-character title limit and where your title gets cut off. You can load up to 3 thumbnails to compare them side by side.

Updated October 17, 2026 · Built by Kevin Tabares, long-form YouTube editor at Umbrella Creators. Specs checked against YouTube Help on October 17, 2026.

Preview your YouTube thumbnail Choose 1 to 3 images or drop them here · JPG or PNG · 16:9

Your images stay on your device. Nothing is uploaded: your browser draws the previews right here, in this tab.

Video title 0 / 100 Channel name Length Views and age

Theme

Home feed (computer)

Search results

Phone

Layouts are close approximations of youtube.com and the YouTube app as of October 2026; YouTube changes sizes often. Grey boxes are placeholders for other videos.

YouTube thumbnail size and rules (2026)

YouTube Help recommends custom thumbnails that:

Use a 16:9 shape for regular videos (9:16 for Shorts).
Are as sharp as possible: YouTube now recommends 3840 × 2160 pixels, with a minimum width of 640 pixels. 1280 × 720 still works and is what most editors export.
Are a JPG or PNG file.
Stay under the upload limit: 2 MB from a phone, 50 MB from a computer.

Titles can be up to 100 characters, but feeds show only about two lines, so the first 40 to 60 characters do most of the work. Source: Add video thumbnails and Edit video settings, YouTube Help, read October 17, 2026.

What to look for in the preview

The small sizes. In the suggested sidebar a thumbnail is about 168 pixels wide. If the face or the main object is not readable there, simplify it.
The bottom-right corner. The length badge covers it. Keep text and faces out of that corner.
Where the title is cut. The tool marks every layout where your title does not fit. Put the words that make people click before the cut.
Thumbnail and title together. They should say two different things: the image shows the moment, the title adds what the image cannot.
Light mode. Dark thumbnails with dark edges blend into dark mode; check both.

Once the video is live, compare the click-through rate with typical ranges using the YouTube CTR checker.

FAQ

Are my thumbnails uploaded anywhere?

No. Your browser opens the images and draws the previews on your own device. Nothing about the images or the title is sent to us.

What size should a YouTube thumbnail be in 2026?

16:9, at least 640 pixels wide. YouTube Help now recommends 3840 × 2160; 1280 × 720 is still fine. Keep the file under 2 MB if you upload from your phone (50 MB from a computer), as a JPG or PNG.

How long can a YouTube title be?

100 characters. Feeds and search usually show two lines, so long titles get cut; the tool shows where.

Can I compare two or three thumbnails?

Yes. Choose up to 3 images at once and they appear side by side in the home feed, so you can pick the one that reads best before you upload or before you set up YouTube's own Test & Compare.

Is it free?

Yes, with no signup. The address is https://umbrellacreators.com/tools/youtube-thumbnail-preview.

Who made this

I'm Kevin Tabares. I've edited long-form YouTube videos since 2015 (1,250 videos and 147.6M+ views tracked on YT Jobs) for channels like Rex & Alexa, Puff and Mud. I built this so you can see a thumbnail and title the way a viewer will, before you upload. If you want an editor for your channel, get in touch.

More free tools

A LUFS meter for your video's loudness, an editor cost calculator, a retention calculator and a CTR checker, all free and without signup.

See all tools →