Thumbnail Tester

No login. No watermark. No daily counter.

All processing happens in your browser. Your thumbnail is not uploaded to any server.

Input

Local file

Upload one thumbnail PNG, JPG, WebP, or GIF. Drag a file here or click to choose.

Video title0 characters

The title is measured in each layout so you can see when it wraps or gets clipped.

Channel name

Duration

Device width 980px

Waiting

Placement board

The board keeps every layout visible while the tabs let you inspect one layout at a larger size.

Not included: server upload, AI scoring, CTR prediction, login, paywall, analytics, export, or download.

Thumb Checkup

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