Subtitle File Editor.
Repair and transform subtitle timing without uploading caption text or optional preview media. Validate, shift, rescale, merge, split and reflow SRT, WebVTT or constrained ASS captions locally, then export independently reparsed soft subtitles.
- ✓Runs in your browser
- ✓No account required
- ✓Verified output
Use Subtitle File Editor
Private in this browser. Subtitle text, timing, filenames, optional media and exported files stay in this browser.
No file selected.
Verified result
Download resultHow it works
- 01
Choose an SRT, WebVTT or constrained ASS subtitle file up to 5 MB.
- 02
Review validation, select a bounded timing or text transform and optionally preview against local media.
- 03
Download SRT or WebVTT only after every exported timing line is independently reparsed.
Frequently asked questions
Does the preview upload my video?
No. Optional media is opened from a temporary local object URL and released on reset.
Does Subtitle File Editor upload my data?
Subtitle File Editor runs locally in your browser. Subtitle text, timing, filenames, optional media and exported files stay in this browser.
What output does Subtitle File Editor create?
Subtitle File Editor creates Srt, Vtt output after the result passes its local verification checks.