Specialized converter · runs 100% in your browser

SUB to WebVTT Subtitle Converter

Convert SUB subtitle files to WebVTT format directly in your browser. Cue timestamps and text are parsed locally; the output stream uses WebVTT formatting and is downloaded immediately. No upload, no signup, no privacy worries.

No uploadNo signupNo trackingFree, unlimited
Drop your SUB file here
or click to choose a file

How to use

  1. Drop your SUB file (or click to browse).
  2. The converter parses cue timestamps and text in your browser.
  3. Cues are re-serialized in WebVTT format.
  4. Click Download to save the WebVTT file.

FAQ

Will SUB formatting tags survive in WebVTT?

Yes, the cue text content is preserved verbatim. SUB and WebVTT have similar plain-text capabilities.

Does my subtitle file upload to a server?

No. Conversion runs entirely in your browser using WebAssembly and Web APIs. Open the Network tab in DevTools while you convert — you'll see no outbound traffic carrying your file.

Is this really free?

Yes. No signup, no quota, no upgrade tier. The conversion runs on your machine, so it costs us nothing to host.

Is there a file size limit?

Browser memory is the only ceiling. On a modern desktop browser, a few hundred megabytes works fine. Mobile devices have tighter limits.

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