Validate subtitles
Report malformed times, overlaps, gaps, and empty cues.
More Audio & video tools
Trim audio, inspect video, extract frames, and fix subtitles.
- Waveform previewInspect a responsive peak waveform and precise duration.
- Trim audioKeep an exact start and end range, then export deterministic WAV.
- Split audioSplit at one or more timestamps and download every segment.
- Join audioJoin multiple decoded audio files in the chosen order.
- Fade in & outApply smooth linear fades without changing the source file.
- Normalize & volumeNormalize peaks and apply a safe gain adjustment.
- Mono & stereoDownmix to mono or create a stereo WAV locally.
- Change audio speedResample audio from 0.5× to 2× with deterministic output.