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Convert, repair and synchronize subtitle files
Already have an SRT or WebVTT file? Convert formats, fix subtitle timestamps with a constant offset or two-point drift correction, and validate cues without uploading or paying for another transcription.
SRT to VTT
Convert SRT to VTT for free, locally in your browser. Preserve words and timestamps, preview the result and download without signing up.
VTT to SRT
Convert a WebVTT caption track to numbered SRT subtitles. Check timing and unsupported positioning without uploading the file.
Fix subtitle formatting
Repair SRT numbering, timestamp punctuation and subtitle formatting safely in your browser. Preview corrections before downloading.
Fix subtitle timestamps
Fix SRT/VTT subtitle timestamps for free: shift early or late captions, or resync two points to correct growing drift. Local browser tool, no upload.
Validate subtitle file
Check SRT and WebVTT for invalid timestamps, cue overlaps and numbering problems privately in your browser.
How this differs from transcription
These tools edit existing timed captions. For a new recording, use our AI SRT subtitle generator.
Your file stays in this browser tab
The subtitle text is read locally into memory; it is not sent to our servers. Your browser still requests the page and static resources from LongScribe.
Supported scope
Up to 1 MB of UTF-8 text and 10,000 ordinary cues. Advanced WebVTT NOTE, STYLE, REGION and timestamp maps are rejected, not silently deleted.