Style-preserving conversion
Colour, positioning, italics and line breaks survive the round-trip, with a live loss matrix that shows exactly what each target keeps before you convert.
00:00:00,000 · for subtitlers & captioners
Subtitle work that never leaves your machine.
Convert, repair, quality-check and re-sync subtitles in the browser, with the styling, positioning and line breaks intact. No uploads. No accounts to just look. No frame ever touches a server.
00:01:12,400
→
00:01:15,900
«مرحبًا بكم»
- and welcome back.
Your subtitle files never leave your device.
Every parse, conversion, QC pass and re-sync runs locally in your browser, including auto-resync, which decodes your audio on-device. Perfect for embargoed episodes, NDAs, and confidential cuts. To be precise: a Pro licence check and cookieless page-view analytics are the only network calls, and they never see your content.
01
See exactly what survives, before you convert.
The live loss matrix compares every target format against your file, so colour, italics, positioning and line breaks are never dropped by surprise. This is the real app, running entirely in your browser.
Built for the work that pays.
Broadcast & OTT formats
SCC (CEA-608), EBU-STL, TTML/IMSC and Apple iTT: import and export the formats delivery platforms actually require.
Arabic & RTL, bulletproof
Right-to-left text, bidi and shaping handled correctly end-to-end, with QC rules written for Arabic, not bolted on.
QC & one-click repair
Reading speed, durations, gaps, overlaps and line length: flagged against a preset and auto-fixed without introducing new issues.
Sync that holds
Shift and linear retime free; frame-rate conversion, drift correction and audio auto-resync for when an ASR transcript drifts against the cut.
Batch, off the main thread
Convert, retime and QC a whole folder at once in a Web Worker, then download the results as a ZIP. Your UI never freezes.
Every format, both directions.
Free
- SRT
- WebVTT
- SBV
- ASS / SSA
Pro broadcast
- SCC
- EBU-STL
- TTML / IMSC
- Apple iTT
One plan. No per-seat games.
Free
$0
- SRT · VTT · SBV · ASS, both ways
- Full style + loss matrix
- QC, repair & shift / retime
- 100% local, no account needed
Pro annual
$59 / year
- Everything in Free, plus:
- SCC · STL · TTML · iTT import & export
- Frame-rate, drift & audio auto-resync
- Batch processing → ZIP
A licence key, activated locally. Cancel anytime.