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YouTube source-checked spec

YouTube Video thumbnail image size

Create a 16:9 thumbnail at 1280x720; verify any current upload-size cap in YouTube Help before compression claims.

1280x72016:9reviewed 2026-06-29verified false
Max file size
unknown in developer source
Accepted formats
JPG, PNG, GIF
Effective date
unknown
Local tool
/resize-to/youtube-thumbnail

Source and note

Source: YouTube Data API thumbnail reference. Reviewed 2026-06-29.

The developer reference supports thumbnail dimensions, but this row does not hard-code a file-size cap.

Platform image specs are compiled from official sources and source-checked by image cat. Platform rules can change, account types can differ, and acceptance is never guaranteed. If an official page does not state an effective date, effectiveDate is set to unknown and verified remains false.