Subtitle Diff
Compare two versions of a subtitle file and see exactly what changed: wording, timing, line breaks, split and merged subtitles.
Your files never leave your browser. Nothing is uploaded.
No files at hand?
What it detects
Matched by time and text
An insertion at the top doesn't make every later subtitle look changed.
Shifted stretches
A re-sync is reported once, not on every subtitle.
Words, punctuation, line breaks
Each kind of edit labelled, down to a changed quote mark.
SRT, VTT and ASS
Compare across formats, in your browser.
Further reading
VTT vs SRT: The Complete Guide to Subtitle Formats
Learn the key differences between VTT and SRT subtitle files, when to use each format, and how to choose the right one for your project.
Read articleAI Subtitle Review: How It Works and Why It Matters
Manual subtitle review takes 3-4x the video duration. Learn how AI review catches grammar, conjugation, and translation errors with one-click fixes.
Read articleWhat is CPS in Subtitles? A Complete Guide to Characters Per Second
CPS determines whether viewers can actually read your subtitles. Learn the standards Netflix, BBC, and broadcasters enforce, and how to check your files before delivery.
Read article