Finds natural pause points in your episode and suggests timestamped chapter markers you can rename and drop into your podcast host's show notes.
The Podcast Chapter Marker Generator finds natural chapter points in an episode — long pauses, music stings, ad breaks — and writes them in the formats podcast apps and video platforms understand. Add your own titles and export in seconds.
Chapter markers let listeners jump to a topic, raise completion rates and give search engines more to index. YouTube needs the first chapter at 0:00, at least three chapters and each at least 10 seconds long, and the tool warns when a list will not qualify.
Silences longer than your minimum pause (below your threshold) are detected with the same 10 ms RMS-and-hysteresis detector used by the other silence tools. A chapter starts 150 ms before the end of each qualifying pause (so the first word is not clipped) if it keeps the previous chapter at least your minimum length. Output formats: mm:ss Title lines; WebVTT cues; Podcasting 2.0 chapters.json (version 1.2.0); and an FFmpeg ;FFMETADATA1 file with millisecond timebase for embedding.
Add chapters to MP3 files with FFmpeg or your host.
Paste chapter lines into the description.
Mark topics for students.
Mark chapter starts.
ffmpeg -i in.mp3 -i chapters.txt -map_metadata 1 -codec copy out.mp3.| Detection | Long pauses with hysteresis |
|---|---|
| Formats | YouTube text · WebVTT · Podcasting 2.0 JSON · FFmetadata |
| YouTube rules | First at 0:00, ≥3 chapters, ≥10 s each |
Use FFmpeg with the metadata file, or paste the JSON into your podcast host.
Apple Podcasts, Spotify, Pocket Casts and Overcast support chapters in various forms.
No — it only detects where natural pauses fall and gives you placeholder labels ('Chapter 2', 'Chapter 3'...) at those timestamps. You still need to rename them to reflect your actual content.
This only works where there's an actual quiet gap in the audio. For episodes recorded without pauses between segments, you'll need to mark chapters manually in your podcast host's editor instead.
This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.
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