YouTube Thumbnail Sizes & Dimensions Explained

There are really two different things people mean by "YouTube thumbnail size" — the size you should upload as a creator, and the different sizes YouTube generates from it afterward. This covers both.

The Size You Should Upload

For a new custom thumbnail, YouTube currently recommends 3840×2160 pixels at 16:9 for videos, or 2160×3840 pixels at 9:16 for Shorts. Use JPG or PNG. These are the dimensions of the image you upload as a creator; a downloadable preview is a separate file and may have different dimensions.

The minimum is 640 pixels wide for videos or 640 pixels tall for Shorts. YouTube currently provides custom Shorts thumbnail uploads in Studio on a computer. These requirements were checked on 6 September 2026 against YouTube’s official thumbnail guidance.

Every Auto-Generated Size, Explained

Once a thumbnail exists, YouTube serves it at several fixed sizes depending on where it's displayed — search results, suggested videos, embeds, and so on. You can preview and download any of these directly from our downloader on the homepage. Note that 1280x720 is the real ceiling here — no size beyond that exists, despite what some tools claim. See our guide on why true 4K YouTube thumbnails don't exist for the full explanation.

Compare Five Real Thumbnail Downloads

Same video, five saved files. Checked on 6 September 2026 using this live-stream example. The dimensions below were read from the downloaded JPEG files. Images are fitted to the cards for comparison; the labels describe the files, not their size on your screen.

How these examples were checked

Each image was requested through ThumbGrab’s download service, returned a successful JPEG response, and was opened for visual inspection. Width and height were read from each file. These are saved results from one video on the date above; the creator may later replace the thumbnail. Images belong to their original creator.

In this example, the 1280×720 and 320×180 files are widescreen. The 640×480, 480×360, and 120×90 files include black bars above and below the artwork. Notice how the small text becomes harder to read in the lower-resolution versions.

Which Version Should You Download?

hqdefault vs. maxresdefault

For the video above, hqdefault is 480×360 and maxresdefault is 1280×720. The difference includes both detail and shape: HQ contains a padded 4:3 image, while max resolution fills a 16:9 image. Enlarging HQ does not restore the missing detail.

sddefault vs. hqdefault

Both measured 4:3 in our test. SD was 640×480 and HQ was 480×360, so the SD file contained more pixels despite the name “High Quality” on HQ. Compare the actual files instead of relying on those labels alone. You can check a video in the thumbnail downloader or read our missing-HD troubleshooting guide.

Shorts Thumbnail Aspect Ratio: Original vs. 9:16

The shape of a Short does not tell you the shape of every image file associated with it. Our saved Standard Quality file for this MrBeast Short is 640×480, including side panels. A centered 9:16 preview displays only the middle part.

Example: I Raced IShowSpeed, by MrBeast. Standard Quality JPEG checked on 6 September 2026. The crop is a visual demonstration, not a separate file produced by the downloader.

The full download and the vertical display crop are different things. Keep an original copy if you plan to crop, and check faces and text before saving. See the tested Shorts download steps or our illustrated explanation of thumbnail black bars and cropping.

The 4 Extra Frame Captures Most Tools Don't Mention

Beyond the five thumbnail sizes above, YouTube also generates four smaller images pulled directly from the video itself rather than from the thumbnail. They aren't really "thumbnails" in the usual sense — they're frame captures originally used for things like autoplay previews and scrub-bar storyboards. Every public video has all four, even ones without a custom thumbnail:

Why Some Sizes Look Boxier Than Others

Notice that sddefault, hqdefault, and default are all stored as 4:3 files — a leftover from YouTube's early, pre-widescreen years — while maxresdefault and mqdefault are genuinely 16:9. For a modern widescreen thumbnail, that means the 4:3 sizes contain the real image centered within a boxier canvas, rather than filling it edge to edge. It's not an error; it's just an old file format that never got fully phased out. If a resolution you expect is missing entirely rather than just boxy, that's a different issue — see our guide on why max resolution sometimes isn't available at all.

Getting Any Size Directly, Without a Tool

Every file name on this page, including the four frame captures above, follows the same predictable pattern. If you know a video's ID — the string after v= in a YouTube URL — you can build the image link yourself:

https://img.youtube.com/vi/VIDEO-ID/FILENAME

Swap in the video ID and any file name from the tables above — for example maxresdefault.jpg or 2.jpg — and the image loads directly in your browser, no downloader needed. This is exactly what our downloader tool does automatically, along with checking which sizes actually exist for a given video so you're never left with a broken image link.

For complete examples using watch, Shorts, and live-stream links, follow our guide to getting a YouTube thumbnail URL.

Frequently Asked Questions