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Join audio files into one

Combine MP3s, voice memos or song sections into a single file. Join them end to end, leave a gap between each, or crossfade one into the next.

I want Join files

Settings appear once you add an audio file.

How the tracks meet

A crossfade overlaps the tracks, so the result is shorter than the parts added up.

Advanced 4

Ignored by the lossless formats.

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Done on your device No upload, no queue, no sign-up.

Bytes sent anywhere: 0 B

Works offline after you’ve used it once.

How to use it

Your tracks go into this browser tab, are joined end to end on your device, and come back as one file. 0 bytes uploaded

  1. Add your files

    Add two or more audio files. They are joined in the order they appear in the list — use the arrows beside a file to move it up or down.

  2. Check the settings

    Choose how the tracks meet: straight after each other, with a gap of silence, or overlapping in a crossfade.

  3. Save the result

    Press join files and save the single result.

Why it doesn’t upload

Joining audio is a matter of writing one file after another and re-encoding the result. FFmpeg does that inside the page, so nothing needs to be sent anywhere.

How to check for yourself

Worth knowing

  • The order is the order in the list. The arrows beside each file move it up or down.
  • Files recorded at different sample rates or channel counts are matched up first, so the join stays in time. That means everything is re-encoded, not copied.
  • A crossfade overlaps the tracks, so the result is shorter than the parts added together. The fade has to be shorter than your shortest track.
  • Tags and artwork are not carried across — the result is a new file with clean metadata.
  • Uses the FFmpeg engine, a one-time 31 MB download.

Questions

How do I merge two MP3 files into one?

Add both files, leave Straight after selected and press join. Because the two files may have been encoded differently, the result is re-encoded once — pick a bitrate of 192 kbps or more for music to keep that invisible.

Can I change the order the files are joined in?

Yes. The order shown in the list is the order used, and the arrows beside each file move it up or down. For a long list, naming your files 01, 02, 03 before you add them puts them in order from the start.

Can I join files that are different formats?

Yes. An MP3, a WAV and an M4A can be joined in one pass; they are converted to a common sample rate and channel layout first. Choose what the result should be under Save as.

What is the difference between a gap and a crossfade?

A gap inserts silence between the tracks, which suits chapters and separate takes. A crossfade overlaps them so one fades out as the next fades in, which suits music. A crossfade makes the total shorter.

Is the joined file lossless?

Only if you save as WAV, FLAC or AIFF. Joining always re-encodes, so choosing MP3 means one further generation of lossy compression — starting from lossless sources avoids stacking two.

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Next steps

Often used before or after Join Audio. These run on your device too.