Format specifications
YouTube thumbnail dimensions and upload file limits
Choose a thumbnail canvas and check the actual upload-device file limit
YouTube video resolution and aspect ratio reference
Match source and intended framing while understanding YouTube's 16:9 reference resolutions
Check YouTube Shorts duration, shape and upload date
- YouTube Shorts classification record
- Video reference and exact version
- Actual upload date
YouTube subtitle file formats and UTF-8 text
Distinguish plain timed caption text from advanced styling and choose a supported file format