Audio URL to podcast RSS

Turn direct audio URLs into podcast RSS feeds.

Save direct MP3, M4A, AAC, WAV, OGG, or WebM links into a private podcast feed.

Open Castline Private podcast feeds

Supported audio links

Castline supports direct audio file URLs such as MP3, M4A, AAC, WAV, OGG, and WebM when the source can be fetched as audio.

Podcast app delivery

Imported audio becomes an episode in a private podcast feed that can be opened from podcast apps using standard RSS.

Clear product boundary

Castline is not a YouTube downloader or video converter. It focuses on saved audio and personal podcast feed delivery.