What the checker looks for
The validator checks parse errors, sequence IDs, timing order, overlaps, gaps, duration, line length and reading-speed limits without silently rewriting the file.
Subtitle tools
Subtitle Fixer & Validator
Inspect subtitle structure and readability problems, jump to affected cues, and choose which safe fixes to apply.
Your subtitle file is processed in your browser and is not uploaded to Voice2Sub.
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Apply only the fixes you want
Safe fixes are selectable. Review the affected cue and keep unrelated diagnostics visible until you decide how to resolve them.
How to use this tool
- Choose a subtitle file.
- Select the operation and review cue diagnostics or loss warnings.
- Preview the result, then export if this operation provides an output.
Supported input and output
- Input
- SRT · VTT · ASS · SSA · TXT · CSV · JSON · LRC
- Output
- Same subtitle format
Questions about this tool
Will it rewrite or translate the dialogue?
No. Safe fixes address supported structural and timing issues. Use the cue preview to confirm your wording and rich formatting remain appropriate.
Do my files or text leave this device?
Your source content is processed in this browser, not uploaded for processing. The browser may download a processing engine from Voice2Sub’s CDN. Those engine requests do not contain your source file.
Need subtitles created automatically from audio or video?Voice2Sub can transcribe spoken audio when you need a complete subtitle workflow instead of a file utility.
Download Voice2Sub →