YouTube Thumbnail Sizes Explained

maxresdefault — 1280 x 720, 16:9, no bars. The largest available, and the one most likely to be missing.

sddefault — 640 x 480, 4:3, adds bars. The usual fallback when maxres does not exist.

hqdefault — 480 x 360, 4:3, adds bars. Always exists for every video without exception.

mqdefault — 320 x 180, 16:9, no bars. Small but correctly proportioned.

default — 120 x 90, 4:3, adds bars. Icon-sized only.

There are also three automatically captured frames taken from roughly a quarter, half and three quarters of the way through the video, each at 480 x 360.

Two of the five named sizes are 4:3 rather than 16:9, a leftover from when YouTube itself was 4:3. Since essentially every thumbnail uploaded today is widescreen, those renditions letterbox the image with black bars along the top and bottom.

This catches people out constantly. hqdefault is the size most tutorials suggest, because it always exists, but it is one of the 4:3 ones. Download it expecting a clean widescreen image and you will spend the next minute cropping bars off.

If you want widescreen without cropping, there are exactly two options: maxresdefault at 1280 x 720, or mqdefault at 320 x 180. Nothing in between is 16:9.

YouTube only generates the 1280 x 720 rendition when the source video was uploaded at 720p or higher. For older uploads, and for anything recorded on lower-resolution hardware, it simply does not exist.

Requesting it for such a video returns a placeholder or an error rather than an image. This is why some thumbnail tools appear to fail on older videos — they only ever request maxresdefault and have no fallback.

When maxres is absent, the largest genuine size is sddefault at 640 x 480. No amount of processing can produce detail YouTube never generated, and anything claiming to deliver HD thumbnails for every video is upscaling, which adds file size without adding information.

Every size also exists as a WebP file. WebP is typically a quarter to a third smaller than the equivalent JPEG at comparable visual quality, and every modern browser, editor and operating system opens it.

For a single thumbnail the difference is trivial. If you are collecting hundreds for competitor research or a design reference board, it is substantial — and there is no quality cost to speak of.

Choose JPEG only if you need compatibility with genuinely old software.

If you are making thumbnails rather than collecting them, YouTube recommends 1280 x 720 as the minimum, at 16:9, under 2 MB.

Uploading larger than 1280 x 720 does not help, because YouTube will not store a rendition above maxresdefault. Uploading smaller means maxresdefault is never generated at all, and your video is stuck with a 640 x 480 maximum forever.

Design for the small sizes too. Your thumbnail will often be seen at mqdefault, 320 pixels wide, in sidebars and search results. Text that reads perfectly at 1280 becomes illegible at 320, which is why effective thumbnails use very few, very large words.

All of this is retrievable with the YouTube thumbnail downloader, which lists every size that genuinely exists for a video, in both JPEG and WebP, with the 4:3 ones clearly flagged so you do not pick one by accident.