Built for the long run.
Chaptify takes one audiobook file and turns it into a folder of chapter files — because the smallest players are the ones that need chapters the most.
A marathon is long. A phone is heavy.
Chaptify exists because of marathon training. On a long run the phone stays home — everything has to fit on the watch: the route, the music, and ideally the audiobook that makes hour three bearable.
The catch: most audiobooks come as one single file, hours long, and most wearables simply refuse to play it. A Garmin will happily sync a folder of songs, but hand it a ten-hour M4B and you get silence.
Splits — in both senses
In running, splits are how you break an impossible distance into pieces you can handle. Audiobooks needed the same treatment: cut the one big file into its chapters, and suddenly the watch treats it like an album and plays it without complaint.
That is everything Chaptify does. It reads the chapter marks already embedded in your M4B or MP3, cuts the audio precisely at each one, zips the chapter files, and emails you a temporary download link. No accounts, no library, no cloud storage of your books.
Made for one Garmin, shared with all of them
The first version was a script that solved exactly one runner's problem. But the problem isn't rare — runners, cyclists, swimmers, anyone with a wearable or an older MP3 player hits the same wall. So the script became this site, free for anyone to use.
Your turn — one file, one address
Chaptify improves through the people who use it. If something didn't split the way it should, a short message steers what gets built next.