Thumbnail Proof
See your thumbnail the way viewers actually will — at real feed sizes, next to its title, under the duration badge — before you upload it.
Your image never leaves this browser. Everything runs locally on your device — no uploads, no storage, no accounts.
or drag it here, or paste (⌘V) straight from your editor
PNG, JPEG, or WebP · YouTube guidance verified 2026-07-22
Slot A — empty. Drop, paste, or choose an image for it.
Your title and settings are saved in this browser — never your image.
In context
Showing slot A
Approximation — measured 2026-07 in macOS Chrome (desktop), signed in, desktop 1920×937 · mobile web 500×701. YouTube's real surfaces drift; these numbers are re-measured quarterly.
Home (desktop)
confidence: high
Your title reads here — type one above to watch it truncate
Search results (desktop)
confidence: high
Your title reads here — type one above to watch it truncate
Suggested sidebar (desktop watch)
Where thumbnails die: the smallest desktop rendering. confidence: high
Your title reads here — type one above to watch it truncate
Home feed (mobile web)
Mobile web (m.youtube.com) in a narrow window — the native app differs slightly. confidence: medium
Your title reads here — type one above to watch it truncate