Reference

How YouTube Thumbnail URLs Work

Every YouTube thumbnail lives at a predictable address built from the video ID. Here's the pattern, and a tool that builds it for you.

Works with youtube.com/watch, youtu.be, Shorts, and embed links.

That doesn't look like a valid YouTube link — double-check and try again.

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The URL pattern

Every thumbnail follows this structure, with only the video ID and quality tag changing:

https://img.youtube.com/vi/VIDEO_ID/QUALITY.jpg

Quality tag	Size
maxresdefault	1280 × 720 (if available)
sddefault	640 × 480
hqdefault	480 × 360
mqdefault	320 × 180
default	120 × 90

Example: for the video ID dQw4w9WgXcQ, the HD thumbnail sits at img.youtube.com/vi/dQw4w9WgXcQ/maxresdefault.jpg.

Frequently asked

Can I build the thumbnail URL myself without a tool?

Yes — grab the 11-character video ID from any YouTube link and slot it into the pattern above. This tool exists mainly to save you that manual step and confirm which sizes actually exist.

Does the URL work for private or unlisted videos?

Unlisted videos generally still expose a thumbnail this way, but fully private videos do not — the image server returns a placeholder or error.

What happens if I request a quality that doesn't exist?

YouTube's image server returns a small grey placeholder image instead of a 404, which is why GrabThumb checks and hides sizes that don't genuinely exist for a given video.