USAGE GUIDE
How the three tools work
Treat every result as a pre-publish checklist and confirm it again in the platform's final editor.
Safe-zone simulator
The red overlays approximate controls and description areas in a 9:16 feed. Actual positions vary across app versions, devices, accounts and experiments.
Open safe-zone checker →Vertical resolution calculator
The calculator multiplies the entered width by 16/9 and rounds to the nearest vertical pixel. Codec, bitrate and platform compression still affect upload quality.
Calculate resolution →Caption pace checker
The checker counts visible characters, spaces and punctuation, divides by display time, and compares the result with language-specific timed-text reference bands.
Check caption pace →Reference sources
The platforms recommend keeping key elements inside safe zones but do not promise one fixed layout for every viewer. Short Safe therefore shows dated approximations.