Free subtitle tools that run in your browser
Fix, convert, and re-time .srt and .vtt subtitles in seconds. Nothing gets uploaded. Every file is processed on your own device, so it stays private and works offline.
Subtitles break in a few predictable ways. They drift out of sync, arrive in the wrong format for your player, run fast or slow after a framerate conversion, or fill up with garbled characters like é and “. SyncMySubs has a focused tool for each problem.
Shift timing
Subtitles too early or too late? Nudge every cue forward or back by a precise offset.
SRT → VTT
Convert SubRip to WebVTT for HTML5 <track> players and the web.
VTT → SRT
Convert WebVTT back to SubRip for desktop players and editors.
Framerate fix
Correct the slow drift from 23.976, 25, and 29.97 fps mismatches.
Fix encoding
Repair garbled accents and symbols, then export clean UTF-8.
Why "no upload" matters
Subtitle files often carry the name of a show or film, and sometimes private notes. SyncMySubs does all of its work in your browser with JavaScript, so your files never leave your computer. There is no server to send them to and no account to create. Every page is static and keeps working once loaded, even offline.