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YouTube thumbnail size and rules

YouTube Help lists the thumbnail requirements by video type. For regular videos the ratio is 16:9. The bot makes a 16:9 image from a text prompt, which fits the shape, and you add the final title text in an editor if you want full control.

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In short: YouTube thumbnail size and rules from YouTube Help: 16:9, 3840x2160 recommended, file limits, formats. Plus a 16:9 AI image for the thumbnail background.

Where: the VisuMate bot in Telegram, no app or sign-up.
Cost: 2 credits per image, 7 images free, then packs from 49 Telegram Stars.
Time: 1 to 2 minutes per image, rerun with a new instruction at the same price.

When you need this

Your upload is rejected or looks cropped and you do not know the limits.
You find five different sizes in five guides and cannot tell which is current.
Your thumbnails look like screenshots and get skipped.

How to do it

1
Open the bot with the link on this page and press Start. Choose the image mode and the 16:9 format.
2
Describe the thumbnail: the subject, the expression or action, the background color, and a few words of text if you want them.
3
In 1–2 minutes the 16:9 image arrives. Download it, check the text, and upload it in YouTube Studio.

Try it on your own photo: 7 images are free, no sign-up.

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What YouTube Help says

On the YouTube Help page about custom thumbnails (checked 2026-10-13), the recommended resolution for videos is 3840×2160 pixels with a minimum width of 640 pixels. For Shorts it is 2160×3840 with a minimum height of 640. The aspect ratio is 16:9 for videos, 9:16 for Shorts and 1:1 for podcast playlists. The page lists a 50 MB limit on desktop and 2 MB for video thumbnails on mobile, and asks for image formats such as JPG or PNG. Limits change, so look at the page before an important upload.

Where the bot fits

The bot returns a 16:9 image through the general image mode, which suits the standard video thumbnail. It gives you the ratio, not exact pixel counts. Resize in an editor if you need a specific resolution. Use the bot for the visual idea: the character, the scene, the mood. Ask for empty space on one side so a title has room.

Text on thumbnails

The bot can draw English words, but AI sometimes misspells them. If the title must be exact, ask for a clean image with space for text and type the words yourself. If you let the bot draw them, keep to two or three words and read every letter.

Tips

Check your video type first. Regular videos use 16:9, Shorts use 9:16 and podcast playlists use 1:1.
Keep the main subject large and away from the bottom-right corner, where the video length badge appears.
Use two to four words of text, or none, and add them in an editor if exact spelling matters.
High contrast between subject and background reads better at small size.
Save a copy in JPG or PNG, the formats YouTube names.

Questions and answers

What ratio is a YouTube thumbnail?

16:9 for regular videos, according to YouTube Help. Shorts use 9:16.

What is the maximum file size?

YouTube Help lists 50 MB on desktop and 2 MB for video thumbnails on mobile. Check the page for the current numbers.

Which formats work?

YouTube Help names image formats such as JPG or PNG.

Does the bot output 1280×720?

It outputs the 16:9 ratio. Export to the pixel size you need in any editor.

How much does a thumbnail cost?

2 credits per image in the general image mode. New users get 15 free credits.

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