Joining files in different formats
You don't need to convert anything first. Before joining, every clip is brought to the same sample rate (44.1 kHz) and to stereo, so an MP3 from your phone, a WAV from a recorder and an M4A voice memo can sit in one track without speed or pitch problems.
Mono clips play from both speakers after joining, and clips recorded at 48 kHz are resampled, which isn't audible.
MP3, WAV or OGG — which output should I pick?
Choose based on where the file is going:
- MP3 (192 kbps): the right choice almost always — small, and plays everywhere.
- WAV: uncompressed, about 10 MB per minute. Use it if you'll edit the result further in an audio editor.
- OGG: similar size to MP3 and well supported in browsers and games, but some car stereos and older devices won't play it.
Adding silence between tracks
With No gap, clips play back to back — best for a song split into parts or a recording that stopped and restarted. A 0.5–1 second gap gives a natural pause between separate voice messages or podcast segments; 2 seconds clearly separates songs in a mix.
Joining isn't mixing
This tool plays files one after another. It doesn't layer them on top of each other — for example, a voice over background music. If a clip has silence at the start or end you don't want, trim it first with the Audio Trimmer so the joins sound tight.