YouTube Thumbnail Size and Format
1280 × 720 · 16:9
1280 × 720 at 16:9 has been the answer for a decade and it still works. It is no longer the answer YouTube gives, though: its own help page now recommends 3840 × 2160, because thumbnails are increasingly seen on television screens rather than phones. The other two facts on this page are the ones that actually cause problems — the file size limit depends on whether you upload from a phone or a computer, and a vertical video will not keep the 16:9 thumbnail you gave it.
The full envelope
| Specification | Value | What it means |
|---|---|---|
| Recommended size | 3840 × 2160 px | YouTube's current recommendation. The long-standing 1280 × 720 remains a perfectly valid baseline and is what most creators still export — the case for 4K is televisions and high-density displays, where a 1280-wide image is being enlarged. |
| Minimum width | 640 px | Below this YouTube rejects the upload. It is worth knowing only as a floor — anything at the floor looks soft everywhere a thumbnail is displayed larger than a search result row. |
| Aspect ratio | 16:9 | For normal uploads. Shorts thumbnails are 9:16 at 2160 × 3840, and podcast playlists want 1:1 — three shapes, decided by what the thumbnail is attached to rather than by preference. |
| Maximum file size | 2 MB from mobile, 50 MB from desktop | The split that produces the most confusing failure on this page: the same image can be rejected in the YouTube app and accepted without comment from a browser on a computer. If a thumbnail will not upload, try it from a desktop before compressing it. |
| File format | JPG or PNG | PNG for anything with sharp text or flat colour, JPG for photographic images where the file size saving is real. YouTube re-encodes either into its own formats for delivery, so the upload format only decides how much quality survives that step. |
Worth knowing
A vertical video does not keep your 16:9 thumbnail
YouTube states this plainly and almost nobody acts on it: vertical videos given a 16:9 custom thumbnail have it replaced by an automatically generated 4:5 thumbnail on the home, explore and subscription pages. The custom image survives in other contexts, so it looks correct wherever you go to check it, and it is absent from the three surfaces where most impressions actually happen. If a video is vertical, the thumbnail decision has to be made in a vertical frame.
The best thumbnail source is usually the video itself
A frame pulled straight from the footage is already correctly exposed, correctly graded and unambiguously of the thing the video is about — three problems a separately shot or generated image has to solve from scratch. At 4K it is also already above YouTube's recommended size. The practical objection is that scrubbing to the right frame and screenshotting it gives you a compressed, player-sized image with interface elements baked in, which is a different picture from the one in the file.
1280 × 720 is not wrong, it is just no longer the ceiling
Pages arguing that 1280 × 720 is obsolete are overstating it. It meets the 16:9 requirement, sits far above the 640-pixel minimum, and compresses to well under even the mobile file size limit. What changed is where thumbnails are seen: on a living-room television a 1280-wide image is being scaled up several times over, and that is the only situation where the difference is visible. Export larger if you have the source; do not rebuild a back catalogue over it.
Thumbnail sizes, and where each one is enough
| Size | Ratio | Verdict |
|---|---|---|
| 640 × 360 | 16:9 | The minimum YouTube accepts — visibly soft |
| 1280 × 720 — this page | 16:9 | The classic answer; fine on phones and desktop |
| 1920 × 1080 | 16:9 | Comfortable headroom, negligible file size cost |
| 3840 × 2160 | 16:9 | YouTube's current recommendation — TV screens |
| 2160 × 3840 | 9:16 | Shorts, not normal uploads |
All five are 16:9 except the last, and all five are accepted. The choice is only about how far the image is enlarged before someone sees it, which is why the recommendation moved when television viewing grew rather than because the old size broke.
The four surfaces side by side
| Surface | Frame | Ratio | Maximum length |
|---|---|---|---|
| Instagram Reel | 1080 × 1920 | 9:16 | 3 minutes in the Reels tab |
| TikTok video | 1080 × 1920 | 9:16 | 10 minutes recorded, 60 minutes uploaded |
| YouTube Shorts | 1080 × 1920 | 9:16 to fill, 1:1 or taller to qualify | 3 minutes |
| YouTube thumbnail — this page | 1280 × 720 | 16:9 | Still image |
Three of the four share one frame, which is why a page that stated only the pixel size would be interchangeable with its neighbours. What separates them is everything else — how long the platform lets a video run, what it will accept as a file, and what its player does to a shape it did not ask for.
Now make a file that fits
Extract a full-resolution still from any video frame and save it as PNG, WebP, or JPEG — frame-accurate, lossless, and never uploaded.
Also useful here: Thumbnail preview, Frame extractor, Aspect ratio — all of it runs on your own machine, with nothing uploaded.
Other platform specs
Frequently asked questions
What is the correct YouTube thumbnail size?
1280 × 720 pixels at 16:9 remains valid and is still what most creators export. YouTube's own help page now recommends 3840 × 2160 at the same ratio, with a minimum width of 640 pixels. The larger recommendation exists because thumbnails are increasingly displayed on television screens, where a 1280-wide image is being scaled up.
What is the maximum file size for a YouTube thumbnail?
It depends on where you upload from: 2 MB for a video thumbnail uploaded from a mobile device, and 50 MB from desktop. Podcast thumbnails get 10 MB on mobile. This is the most common cause of a thumbnail being rejected for no apparent reason — the same file that fails in the app uploads without complaint from a computer.
What format should a YouTube thumbnail be?
JPG or PNG. Use PNG when the design contains sharp text or flat blocks of colour, where JPG compression leaves visible artefacts around edges. Use JPG for photographic images, where the file size saving is substantial and the artefacts are not visible. YouTube re-encodes both for delivery regardless.
Why is my thumbnail not showing on my vertical video?
Because it is 16:9. YouTube replaces a 16:9 custom thumbnail on a vertical video with an automatically generated 4:5 crop on the home, explore and subscription pages. Your thumbnail is still attached and still appears elsewhere, which is why it looks fine when you check — but on the surfaces where most impressions happen, it is not the image being shown.
Can I use a frame from my video as the thumbnail?
Yes, and it is often the best source: a frame from the footage is already correctly exposed and graded, and at 4K it already exceeds YouTube's recommended size. Take it from the video file at full resolution rather than screenshotting the player, which gives you a compressed, player-sized image with interface elements baked into it.