00 · subtitle toolkit
Subtitle tools that run in your browser
Convert, resync, fix and edit subtitle files — SRT, VTT, ASS/SSA, SUB and plain text. Everything happens on your device. No upload, no account, no waiting.
Files never leave your device Instant — no upload Free, no sign-up
All tools
12 live · 0 arriving soonConvert
Sync & time
Combine
Repair
Understand the formats
Plain-language references for how subtitle files actually work — what each format stores, why files break, and which fix applies to which symptom.
Why fixsubtitles
Nothing is uploaded
Every tool parses and writes files in your browser with JavaScript. Your subtitles — which often reveal what you’re watching — never touch a server.
It tells you what it changed
Dropped a cue setting, fixed broken numbering, stripped a tag? You get a plain list of every edit. No silent corruption of edge-case files.
Built for real files
Mojibake, framerate drift, three-hour films, Arabic and CJK, broken timestamps — handled deliberately, not assumed away.