Batch subtitle fixer

Select multiple subtitle files, shift their timelines if necessary, repair formatting and download a ZIP of results.

Workspace

Runs locally in your browser. No file upload.

Private, on-device processing

↑Drop a file here or choose oneRead locally · No upload · Size limits vary by tool

No file selected

Input text encoding

Output format

Shift seconds (negative = earlier)

Output and diagnostics appear below after processing.

How it works

All files are read locally and parsed into subtitle cues. Repair normalizes numbering and timestamps; a nonzero shift changes cue times. Results are provided in a single ZIP, with a warnings report.

Important limitations

Batch mode cannot restore unreadable bytes; select the correct source encoding. Advanced VTT cue settings may be discarded when converting to SRT.

Frequently asked questions

Are my files uploaded?

No. The file is processed in your browser. This version does not transmit user file content to any server.

Is batch subtitle fixer free?

Yes. The browser processing tools are free and do not require an account or API key.