Thumbnail dimensions guide
YouTube Thumbnail Sizes
YouTube thumbnail sizes vary by video and candidate. TubeSnaps checks actual image dimensions so you can choose the best available preview image.
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Common YouTube thumbnail candidates
| Candidate | Common expected size | Recommended use |
|---|---|---|
maxresdefault | 1280 x 720 | Best available HD choice when it exists. |
sddefault | 640 x 480 | Fallback for previews and editorial references. |
hqdefault | 480 x 360 | Reliable fallback for many videos. |
mqdefault | 320 x 180 | Small preview or lightweight reference. |
default | 120 x 90 | Tiny fallback only. |
Why actual dimensions matter
Filename alone does not prove quality. A high-resolution URL can be unavailable, and a missing candidate can return a small placeholder-like image. Check natural width and height before using a thumbnail in a blog hero, social post, or creator workflow.
How TubeSnaps labels size results
TubeSnaps loads public thumbnail candidates in the browser, reads natural dimensions, identifies 16:9 or 4:3 aspect ratios, and flags suspicious tiny results as placeholder suspected.
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FAQ
Common questions
What size is maxresdefault?
When available, maxresdefault is commonly 1280 x 720 for a 16:9 thumbnail, but TubeSnaps checks the actual browser-loaded dimensions instead of assuming it exists.
Why is hqdefault often 480 x 360?
hqdefault is a common 4:3 fallback candidate. It may be reliable, but it is not always ideal for 16:9 hero images.
Which YouTube thumbnail size should I use?
Use maxresdefault when it is truly available and high-resolution. If not, try sddefault, hqdefault, mqdefault, then default based on actual dimensions and your use case.