Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Home / Subtitles / Subtitle Editor

Create and edit subtitles against a video preview. Set times from the player, split lines, save SRT, VTT or ASS.

Free, no uploads, no sign-up. Runs 100% in your browser.

The video plays in your browser with the current line drawn on top. Every edit stays on your device.

Input: SRT, VTT, ASS, SBV, SUB, LRC, MP4, WEBM, MOV. Output: SRT, VTT, ASS, SSA, SBV, SUB, LRC, SMI, TTML, JSON, CSV.

Lines shown in amber are too fast to read (over 21 characters per second) or overlap the next line.
Space plays and pauses, [ and ] set times for the selected line.

Are my files uploaded?: No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
Is it free? Are there limits or watermarks?: Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
Does it work offline?: Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Subtitle Shift and Sync: Fix out-of-sync subtitles: shift all lines, correct frame rate drift, or line up two points.
Subtitle Converter: Convert between SRT, VTT, ASS, SSA, SBV, SUB, LRC, SAMI, TTML, JSON and CSV in bulk.
Audio Transcriber: Transcribe speech with on-device Whisper AI and export SRT.
Extract Subtitles: Pull embedded subtitle tracks out of MKV, MP4 and MOV videos as SRT, VTT, ASS and more.