Audio joiner

Join audio files in three steps

1. Choose two or more audio files, or press Try sample to load two example clips.
2. Arrange the clips in order and choose a crossfade length, or leave it at zero for a straight cut.
3. Press Join audio, listen to the preview, and download the combined MP3.

When to join audio files

Joining is how you assemble a podcast from an intro, an interview, and an outro, stitch together voice memos recorded in pieces, or build a continuous mix from several tracks. It also rebuilds a long recording that a phone or recorder split into parts at a file size limit.

Crossfade or straight cut

A straight cut puts the next clip right after the previous one. It suits speech, where each clip begins and ends naturally. A crossfade of half a second to two seconds blends the end of one clip into the start of the next, which suits music and avoids the abrupt jump between two different recordings. A crossfade shortens the total length by its own duration for each join.

Mixed formats and settings

You can combine different formats in one go, such as an M4A voice memo and an MP3 intro. The joiner resamples everything to the rate of the first clip and brings mono clips up to stereo when another clip is stereo. The result is one MP3 at 192 kbps. For the best quality, join the originals instead of files that were already converted.

Limits to keep in mind

Every clip is decoded into memory before joining, so the total length is limited by your device. An hour or two of audio is fine on a laptop. On a phone, join shorter sets. Nothing is uploaded, and the clips are cleared from memory when you close the tab.