Specs · Thumbnail file format
Five formats are accepted. Only two are worth using, and the wrong export settings are the usual reason a sharp design uploads blurry.
YouTube accepts thumbnails in JPG, PNG, WEBP, GIF and BMP, up to 2 MB, at a 16:9 ratio with a minimum width of 640 pixels. In practice the choice is between JPG and PNG: JPG for photographic thumbnails, PNG when flat colour and sharp text dominate. WEBP is a good middle ground; GIF and BMP have no advantage.
Whatever you upload, YouTube re-encodes it into its own compressed versions. The format decides how much detail survives that second compression — which is why an over-compressed JPG looks soft in the feed even though the source looked fine on your screen.
What each one is good for, and when it works against you.
Best for photos and faces. Export at 85–90% quality; at 1280 × 720 that lands around 200–400 KB, far under the limit.
Lossless, so crisp edges stay crisp. Photos can push it over 2 MB; use PNG-8 or switch to JPG if it does.
Roughly 30% smaller than JPG at equal quality. Accepted by YouTube; not every design tool exports it cleanly.
Static only — YouTube does not animate thumbnails. 256 colours makes gradients band. Avoid.
Huge files for no gain. A 1280 × 720 BMP is about 2.7 MB, already over the limit.
The upload is rejected above it. Ninety percent of rejections are a PNG with a photo in it; re-export as JPG.
JPG for thumbnails with photos or faces, exported at 85–90% quality. PNG for flat graphics where text edges must stay perfectly sharp, as long as the file stays under 2 MB. WEBP works too and is smaller than either. GIF and BMP are accepted but offer no advantage.
Almost always the 2 MB limit — typically a PNG containing a photo. Re-export as JPG at quality 85 and it will land well under. Other causes: an image under 640 pixels wide, a non-16:9 ratio the uploader cannot handle, or an unverified account, which cannot use custom thumbnails at all.
No. A GIF is accepted but only its first frame is used, and the 256-colour palette makes gradients and skin tones band. Export a JPG instead.
Not beyond a point. YouTube re-encodes every upload; a 1.8 MB JPG and a 400 KB JPG at quality 90 look identical after processing. Sharpness comes from resolution, text size and contrast, not from file weight.
JPG at 1280 × 720, sRGB, under 2 MB, ready to upload. Text is sized to remain readable at feed scale, which is what actually keeps a thumbnail looking sharp after YouTube's compression.
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