YouTube thumbnail size
what it asks for at upload, and what it serves afterwards
Updated: October 2026 · 5 min read
YouTube recommends uploading the thumbnail at 3840×2160 (16:9, 640 px minimum width) as JPG or PNG; from a phone it can weigh up to 2 MB, from a computer up to 50 MB. Afterwards YouTube serves it in five sizes, the largest being 1280×720: that's the one you can download. For a Short, vertical: 2160×3840. Guide · 3 minutes
What YouTube asks for at upload
YouTube's official help, in its 2026 version, asks for a resolution of 3840×2160 for videos and 2160×3840 for Shorts, with a minimum width of 640 px; a 16:9 ratio for videos; JPG or PNG; and a maximum weight of 2 MB when uploading from a phone (10 MB for podcasts) or 50 MB from a computer. The 1280×720 figure you'll see repeated in many guides is the previous recommendation: it still meets the minimum and looks fine, but it's no longer what YouTube suggests.
Source: YouTube Help · Add video thumbnails
What YouTube serves afterwards
Whatever you upload, YouTube generates five copies and serves the public at most 1280×720 (MaxRes). That's why no program or website returns a 4K thumbnail: it doesn't exist outside the channel. Two of the copies, SD (640×480) and HQ (480×360), are 4:3 with black bars; MQ (320×180) and MaxRes are 16:9. In search results YouTube prints the video's duration over the bottom-right corner of your image: keep text out of there.
Design for 320×180
Most people see your thumbnail in a list, 320 px wide or less, on a phone. Whatever can't be read at that size is useless, however sharp it looks at 3840×2160. Three or four big words, a face or an object with contrast, and nothing important near the edges or the bottom-right corner. An honest test: save the thumbnail, open it and shrink the window until it's about an inch wide.
Common mistakes
- Small text — unreadable at 320×180; test your thumbnail at that size before uploading
- Bottom-right corner — that's where the duration goes
- Uploading 4:3 or square — it shows with bars or cropped; always 16:9
- Over 2 MB from a phone — YouTube rejects it; from a computer the cap is 50 MB
- WebP or HEIC — YouTube wants JPG or PNG; convert first (AppGrabbit does it on your PC, 1 credit per file)
Compared
| Size | Ratio | What it's for | |
|---|---|---|---|
| MaxRes | 1280×720 | 16:9 | Saving it in the best quality; a player's poster |
| SD | 640×480 | 4:3 with bars | Videos that have no MaxRes |
| HQ | 480×360 | 4:3 with bars | The one that always exists; previews |
| MQ | 320×180 | 16:9 | Lists and small views: what most people see |
| Tiny | 120×90 | 4:3 | Icons; hardly ever useful |
Step by step
- 1Copy your video's link — already published, with the thumbnail uploaded.
- 2Paste it in AppGrabbit's Thumbnail tab — the app shows you the sizes YouTube has for that video.
- 3Check whether MaxRes shows up — if it doesn't, YouTube stored your thumbnail small: upload it again, larger.
- 4Save it and open it at 25 % — or shrink the window: that's how people see it in a list. Can you read it?
- 5Fix it and re-upload — in YouTube Studio › Video details › Thumbnail. It takes a while to change in every size.
Frequently asked questions
Yes: it meets the 640 px minimum width and it's what YouTube serves the public. 3840×2160 is the current recommendation so it stays sharp on large screens.
No: YouTube wants JPG or PNG. Convert it first; AppGrabbit does it on your PC (Convert, 1 credit per file).
2160×3840, vertical (9:16), according to YouTube Help.
Minutes to hours: YouTube regenerates it in every size and keeps cached copies. The image address shows what it has at that moment.
Because there it's shown 320 px wide and compressed. High contrast, few words and nothing fine help: thin lines and small text get lost.
With AppGrabbit's Thumbnail tab: paste the link, pick size and format, and it's saved. Free, no credits.
Related guides
Check your thumbnails the way people see them
Paste the link, see which sizes YouTube has, and save it to test it small. Free in AppGrabbit for Windows 10/11.