Free Tool
SRT Validator
Check your SRT subtitle files for errors, missing sequences, timing overlaps, and format issues. Instant results, no upload needed.
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Supports .srt, .vtt, .txt files
hours
minutes
Add SRT files (2+)
seconds
Result
How It Works
Drop Your SRT File
Drag and drop or browse to select an SRT subtitle file from your computer.
Instant Validation
The validator checks sequence numbers, timestamp format, timing overlaps, and empty cues.
Review Results
See a clear report of errors and warnings with line numbers for easy fixing.
Frequently Asked Questions
What errors does the SRT validator check for?
The validator checks for: missing or out-of-order sequence numbers, invalid timestamp format (must be HH:MM:SS,mmm), end time before start time, overlapping cues, empty subtitle text, and unusually long durations (over 15 seconds).
Is my subtitle file uploaded to a server?
No. All processing happens entirely in your browser. Your file never leaves your device — there is no server upload.
What SRT format does the validator expect?
Standard SubRip format: numbered sequences, timestamps in HH:MM:SS,mmm format separated by -->, and subtitle text.
Can I validate VTT files too?
This tool is specifically for SRT files. For VTT files, use our VTT to SRT converter first, then validate the output.
How do I fix the errors found?
The report shows each issue with its block number. Open your SRT file in a text editor, find the corresponding block, and fix the timestamp or sequence number as indicated.
Need Full Transcription?
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