Guides
YouTube thumbnail guides for people who ship stills
Each article is one question: which file exists, why maxres is missing, how Shorts crop, whether you may use the image. Not twenty clones of “download HD now.” Standards: how we write.
The files themselves
How YouTube thumbnails work
CDN paths, placeholders, oEmbed, and what this site actually fetches.
YouTube thumbnail sizes (2026)
maxres, hq720, SD, HQ, default, WebP — pixels and when they exist.
What 4K / UHD thumbnail means
A 4K video does not get a 4K still. Here is the honest cap.
WebP vs JPG thumbnails
vi vs vi_webp, and when to keep the original.
Custom vs auto-generated stills
What Studio replaces, and the four frames that remain.
How to grab and use them
How to download a YouTube thumbnail
Paste, probe, save — and the old img.youtube.com trick.
Save a thumbnail on iPhone or Android
Share sheet → browser → Downloads or Photos. No extra app.
YouTube thumbnail URL format
i.ytimg.com, img.youtube.com, maxresdefault, vi_webp.
Find a YouTube video ID
Watch, Shorts, embed, live, youtu.be, music, nocookie.
YouTube Shorts thumbnails
16:9 files in a 9:16 player.
Safe zones and mobile crop
Where titles, duration, and phone chrome sit.
Using thumbnails legally
Public file ≠ your file. Own channel, license, fair use.
Thumbnail glossary
maxresdefault, video ID, oEmbed, placeholder, and more.