Join audio files into one

How joining works

1. Add up to 20 files. They join in the order shown, top to bottom.
2. Drag a track by its grip, or use the ↑ and ↓ buttons, to change the order. A Drop here bar shows where it will land.
3. Select a track and drag the dark edges of its waveform to trim the start and end, or type the exact times.
4. Add a fade in or out, a crossfade into the next track, or a gap of silence after it.
5. Press Play all tracks to hear the whole reel, then export.

Fades, crossfades and gaps

A fade belongs to one track — it eases that track in or out of silence. A crossfade belongs to the seam between two tracks: the outgoing track fades down while the incoming one fades up, overlapping, so there is no gap and no click.

Raising a crossfade therefore makes the finished reel shorter, because the two tracks overlap. A crossfade is capped at half the shorter of the two tracks, so it can never swallow one whole.

A gap does the opposite: it adds silence after a track, one second by default and up to thirty, like the pause between songs on an album. A seam has either a crossfade or a gap, never both.

Speed, pitch and volume

Under Adjust, every track has its own speed (50–200%), pitch (up to 12 semitones up or down) and volume (up to 800%). Speed changes the tempo without changing the pitch, and pitch changes the key without changing the length. Auto beside it measures that one track and sets its volume and trim for you.

Match loudness and trim silence

Files from different sources rarely sit at the same level. Open Adjust on a track and Match loudness measures it and sets its volume to reach one target: −14 LUFS for streaming, −16 for podcasts or −23 for broadcast. Trim silence beside it finds where the sound really starts and ends and moves the track’s trim there, leaving the padding you set. Both write into fields you can still adjust by hand, and Auto runs the two together. A track too quiet to reach the target is raised as far as it will go, and the page tells you so.

Leaving a track out

The eye button takes a track out of the reel without removing it: it is not played, not exported, and the tracks either side close up. Press it again to put it back.

Exporting

Choose WAV, MP3 at 192 or 320 kbps, FLAC, or M4A where your browser supports it. If the joined reel would clip, it is turned down just enough to avoid distortion; otherwise its level is left alone.