YouTube thumbnail preview tool

What the preview shows

On YouTube a viewer decides in a fraction of a second whether to click. He sees a small image, a title of two lines and your channel name. Everything else, the script, the edit and the sound, comes after that. This tool shows that first impression in four places: the home feed on a laptop, search results, the list beside a video that is already playing, and the feed on a phone.

Type your title and the search term you want to be found for. Load your thumbnail, or keep the sample image while you test the title. The tool measures your title in the font YouTube uses and cuts it roughly where the space runs out in each place. It warns when the title is longer than the 100 characters YouTube allows, when your search term drops off on a phone, and when most of the title is in capitals.

Your image stays in your browser. It is not sent to us or to YouTube. The tool only reads its width, height and file size to say whether it fits.

Where YouTube cuts your title

YouTube does not publish where it cuts a title. It depends on the screen, the language and the width of each letter: a W takes more room than an i. Our tool measures in pixels, not characters, and uses its own estimate of the text boxes on a 1440 pixel laptop and a 390 pixel phone. Treat the result as a good approximation, not a promise to the letter.

The pattern is clear. Whatever sits in the first 40 to 50 characters, everyone sees. What comes after, only people searching on a laptop see. So put the search term and the promise of the video first, and keep the details for the end. Google treats a title the same way, as our SERP preview shows for your web pages.

A thumbnail that works small

YouTube asks for a 16:9 image at least 640 pixels wide, in JPG, GIF or PNG. From the app it can weigh up to 2 MB, from a computer up to 50 MB. An export at 1280 by 720 pixels is the safe minimum; 3840 by 2160 looks sharp on big screens.

The image rarely appears large. Beside a playing video it is about 168 pixels wide, smaller than a stamp on your screen. What holds up at that size:

• One face or one object, large in frameA full room with ten people becomes a smudge.
• Three or four words at mostThe title is already beside it. A thumbnail that repeats the title wastes its space.
• Strong contrastLight on dark or dark on light. Pastel on pastel vanishes in the feed.
• Nothing in the bottom right cornerThat is where YouTube puts the length of your video.

For a video podcast a still of the guest with a short quote often works better than the show logo. How we set up recordings so they yield usable stills is covered under video podcast production.

Testing in YouTube itself

If you are torn between two images, YouTube Studio has a built in test. Under the thumbnail, click Test & compare and load up to three versions. YouTube shows them to different viewers and picks a winner on watch time share, not on clicks. An image that draws clicks but makes people leave quickly does not win. The test works on long videos, saved livestreams and podcast episodes, not on Shorts.

Use this preview before you publish, to filter out the weak versions. Then let the test in YouTube choose between the good ones.

After a week, look at what Studio tells you. The click rate on impressions shows whether title and image work; average view duration shows whether the video delivers what it promised. A high click rate with a short view duration nearly always means a promise that was too big. To compare reactions and shares with other channels, use our engagement rate calculator.

What comes after the click

A good title brings viewers in. What they do next depends on the video itself and on how easily they find what they came for. Chapters in your video help: they show the structure in the timeline and sometimes appear on their own in Google. A full description with links to your site does the rest. If you would rather have your channel managed, read what we do under YouTube channel management. If the file still needs exporting, first work out how big it will be.

Your thumbnails as a family

A viewer who sees three videos from your channel should know they are yours without reading your name. A fixed place for the face, a fixed colour for the text and the same typeface get you there. It is the same logic as your brand identity: recognition comes from repetition, not from something new each time.

So make a template with two or three variants: one for conversations, one for explainers, one for news. Keep it next to your content calendar, so whoever edits the video makes the image too. If the same video also runs as an ad, the image matters there too: a YouTube ad runs through Google Ads and shows your thumbnail in search. Questions about your own channel go through contact.