SRT subtitle checker
Open or paste an .srt file. The checker flags subtitles that are too fast to read, too long per line, too short or long on screen, or overlapping.
How it works
Subtitles that look fine in an editor can still fail review: one line runs past 42 characters, a two-word cue flashes for half a second, or a fast speaker pushes reading speed past what viewers can follow.
How to use it: pick the subtitle language (English, Korean, Japanese or another Latin-script language), tick Children’s content if it applies, then open your .srt or paste it and press Check subtitles. The table lists only cues with problems.
Rules used: reading speed (English 20 characters per second, Korean 12, Japanese 4; slower for children’s content), max characters per line (42 / 16 / 13), at most two lines, minimum 5/6 second and maximum 7 seconds on screen, no overlaps. These numbers come from the public Netflix Timed Text Style Guide; passing them is not a Netflix approval.
FAQ
Is my file uploaded?
No. The file is read inside your browser and never leaves your computer.
Which formats?
SRT. Styling tags like <i> are ignored when counting characters.