YouTube Thumbnail & Banner Size Guide (2026)
A YouTube thumbnail is an advert for your video that has to work at postage-stamp size. The size rules are simple. What trips people up is the file-size limit, and the parts of a channel banner that get cut off on some screens. Here is what to use, and how to hit it.
By the CrispPic team3 min read
YouTube image sizes at a glance
| Format | Size (pixels) | Ratio | File limit |
|---|---|---|---|
| Video thumbnail | 1280 × 720 (at least 640 wide) | 16:9 | JPG, PNG or GIF, under 2 MB |
| Channel banner | 2560 × 1440 (at least 2048 × 1152) | 16:9 | Up to 6 MB |
| Channel profile picture | 800 × 800 | 1:1, shown as a circle | — |
Some recent guides report that YouTube now recommends higher-resolution thumbnails, up to 4K, and accepts larger files from a computer. Sources disagree on the details, so 1280 × 720 and under 2 MB remains the safe choice — it works on every upload path.
Thumbnails: design for small
- Make it readable at tiny size. Few words, large lettering, strong contrast. Most viewers see it about as big as a stamp.
- Keep the bottom-right corner clear. YouTube overlays the video length there.
- Use a clear focal point — a face, an object — rather than a busy scene.
- Choose the format by content. JPG is smallest for photographic thumbnails; PNG keeps text edges crisp but produces bigger files.
Getting a thumbnail under 2 MB
A 1280 × 720 image is usually well under 2 MB as a JPG, but a detailed PNG can exceed it. Set the dimensions and the 2 MB cap together and the tool lowers the quality only as far as it has to.
Channel banners: the safe area
The banner is displayed differently on phones, tablets, desktops and TVs. Only the central area — about 1546 × 423 pixels — is visible on every device, so keep logos, names and text inside it. The rest of the 2560 × 1440 canvas is background that extends to fill larger screens.
Getting the file ready, step by step
- Design or crop at 16:9. For a photograph, use the Widescreen ratio in the crop tool.
- Resize and cap the size in one pass: the thumbnail page sets 1280 × 720 under 2 MB, and the banner page sets 2560 × 1440 under 6 MB.
- Check the before/after slider, especially any text.
- Download and upload it in YouTube Studio.
Frequently asked questions
What size is a YouTube thumbnail?
1280 × 720 pixels in a 16:9 ratio, at least 640 pixels wide, and under 2 MB.
What size is a YouTube channel banner?
2560 × 1440 pixels is recommended, with 2048 × 1152 as the minimum, and a limit of 6 MB.
Why is my channel banner cut off?
Different devices display different parts of it. Only the central safe area of about 1546 × 423 pixels shows everywhere, so keep important content inside it.
Why is my thumbnail rejected?
The most common causes are a file over the size limit, an unsupported format, or an image that is too small. Resize it to 1280 × 720 and keep it under 2 MB.
Try it with the right settings already applied
These pages open the CrispPic tool pre-configured for this exact case. Your image is processed in your own browser — it is never uploaded anywhere.
Free, no account, no watermark.
Keep reading
- Instagram Photo Size Guide (2026): Posts, Stories & ProfileThe right pixel sizes for Instagram feed posts, Stories, Reels covers and profile photos in 2026 — and how to export a photo that stays sharp.
- X (Twitter) Image Sizes (2026): Profile, Header & PostsImage sizes for X (Twitter) in 2026: profile photo, header and in-feed pictures — plus the file-size limits and how to avoid ugly timeline crops.
- How to Reduce Image Size Without Losing QualityWhy photos are so big, and the four steps that shrink them by 70–90% with no visible difference: resize, pick the right format, set a sensible quality, trim the rest.