Audio chapter splitter
Split one long recording into separate WAV files from your own list of chapter start times, with gaps and overlaps flagged.
Accepted files: .wav,.mp3,.m4a,.aac,.flac,.ogg,.oga,.opus,.webm,audio/*. Choose one file. Up to 256 MiB in total.
One recording up to 256 MiB and 10 minutes, at most 999 chapters and 100,000 characters of chapter list. WAV is read with every sample intact; other formats are decoded by your browser at 48 kHz. Everything is processed on your device and nothing is uploaded. Download: ZIP of WAV files, a JSON report and a CSV chapter list. One chapter per line: a start time, an optional end time and a title. Up to 100,000 characters. Review the settings before running.
Your result
How to use Audio chapter splitter
- Choose the recording to split.
- Paste one chapter per line: a start time, an optional end time and a title.
- Split the audio and check the report for gaps, overlaps or times past the end.
- Download the ZIP of chapter files and the CSV chapter list.
Useful next steps
Chapter list
Write one chapter per line, such as 0 Intro or 1:02:03.5 Part two. Times can be seconds, minutes and seconds or hours, minutes and seconds. An optional end time can follow the start, as in 0 1:30 Intro. CSV lines such as 0,90,Intro also work. Lines starting with # are ignored.
Checks
Start times must increase. A chapter without an end time runs to the next start, and the last one runs to the end of the audio. The report flags a gap when a chapter ends before the next one starts, an overlap when it ends after, and a leading gap when the first chapter does not start at 0. A chapter outside the audio stops the split.
Files
Each chapter becomes a WAV named with its number and title, stored uncompressed in a ZIP file. Cuts are made at the nearest sample, and the source format is kept when the sample format is set to match.