Your subtitles, fixed and publish-ready — right in your browser
Shift timing, convert frame rates, correct drift, censor words, and validate against Netflix, BBC, and WAI style guides — or pull subtitles straight out of MKV/WebM video. Everything runs locally in your browser, so your files never leave your device.
Shift & rescale timing
Timing tools
Nudge every timestamp by a fixed offset, or rescale timing when a subtitle was authored for a different frame rate. Re-sync subtitles that drift out of step using two reference points.
Censor & validate
Content tools
Mask chosen words across the whole file in one pass, and flag invalid or overlapping timing and overlong lines against selectable style guides — Netflix, BBC, WAI, EAA, and Netflix Japanese/Chinese. One click auto-wraps a too-long line.
Extract from video
MKV / WebM
Pull embedded text subtitle tracks (SRT, ASS/SSA) straight from an .mkv/.webm container by streaming the file — no video engine, no downloads, no heavy memory load.
Encoding fix
Garbled files
Re-decode a file under a different text encoding if it came in garbled, and optionally add a BOM on export.
Download once. Run forever, offline.
The entire toolkit is static files that run in the browser. Grab the release ZIP and keep your own copy — extract, install once, and it works with no account and no server.
The beginner's guide walks you through your first file in under five minutes — no jargon, no setup.
Subtitle Toolkit Pro — $9, one-time, yours forever
Batch power for whole folders of subtitles — still fully local
- Batch-process an entire folder of .srt files at once — one config, one ZIP download
- Batch video extraction — every text subtitle track from many MKV/WebM files
- Saved presets — name a transform config, re-apply it in one click
The free single-file tools stay free, anonymous, and fully local. Pay once and Pro is yours forever — it follows your account on any device, and your files never leave your machine.
Android companion
The same toolkit on your phone — process .srt files offline, anywhere. Install the APK directly (sideload; "install unknown apps" prompt).
Android build — not published at 0.3.0
