Join Audio

🔗
Click to upload or drag and drop

Select multiple audio files (Max 10MB total)

ℹī¸ How it works:
  • Select two or more audio files
  • Drag to set the order you want
  • Download one merged MP3

Make One Audio File from Two or More

Upload the files, drag them into the order you want, and they are joined one after another into a single track — songs, voice recordings, podcast segments, lecture parts, anything with sound in it. They play in sequence, not on top of each other. You can put two audio files together or twenty, mix formats freely, balance each one's volume, and blend the joins with a crossfade. The result downloads as a single MP3. No sign-up and no watermarks.

How to Join Audio Files

  1. Select two or more audio files above (up to 10 MB in total).
  2. On the next screen, drag them into the order you want.
  3. Set each track's volume if one is louder than the rest, and add a crossfade if you want the joins to blend.
  4. Preview the transitions, then join and download your single MP3.

One After Another, Not On Top of Each Other

This is the distinction worth getting right before you start. Joining puts your files in sequence: file one finishes, file two begins, and the result is as long as all of them added together. That is what you want whether you put songs together for a playlist or join recordings made weeks apart. If instead you want two things playing at the same time — a voice over a backing track, for instance — that is a different job, and Overlay Audio is the tool for it. A quick test: if the finished file should be longer than any single input, you are in the right place.

Features

  • Multiple files at once – add as many clips as you like in one upload
  • Drag to reorder – set the exact sequence before joining
  • Per-track volume – a gain slider for each file, so a quiet recording can be lifted to match the others
  • Optional crossfade – blend one track into the next, up to 5 seconds
  • Normalize option – evens out the loudness across every track automatically
  • Mixed formats welcome – MP3, WAV, OGG, FLAC, AAC, M4A and WMA can all go into the same join
  • Transition preview – hear just the joins before committing, without sitting through the whole thing

When You Might Need This

  • Making one audio file from two files that were recorded in separate sittings
  • Putting songs together into a single continuous track for a party or a playlist
  • Assembling a podcast from its intro, main segment and outro
  • Joining audiobook or lecture chapters so they play without stopping
  • Stitching several short voice memos into one recording you can send
  • Rejoining a long file you had to split up to upload somewhere
  • Adding a short sign-off or announcement onto the end of a recording
  • Putting an interview back together after cutting the unwanted parts out

Frequently Asked Questions

Select both files in the upload box above — hold Ctrl, or Cmd on a Mac, to pick more than one — then drag them into the order you want on the next screen and press join. You get back a single MP3 containing the first file followed by the second. The same process works for any number of files, not just two.

Joining puts files one after another, so a two-minute clip and a three-minute clip give you five minutes. Overlaying plays them at the same time, so the same two clips give you three minutes with both sounds together. Use this page for chapters, segments and compilations; use Overlay Audio for a voice over music, or any two sounds that should be heard together.

Yes, and you should check it rather than trusting the upload order, which follows however your computer happened to list the files. Drag them up or down on the join screen; they are joined top to bottom exactly as shown. Files named “part 1, part 2, part 10” are the classic trap, since many systems sort 10 before 2.

By default each file begins the instant the previous one ends, with no gap at all. A crossfade instead overlaps the join, fading one track down as the next comes up, for up to 5 seconds. For music it turns an abrupt change into a smooth transition. For speech, leave it at zero — a crossfade there makes two people talk over each other for a second, which sounds like a mistake.

Two ways. Each track has its own volume slider, so you can lift just the quiet one by ear. Or turn on Normalize, which brings every track to a consistent level automatically before they are joined — usually the better choice when the files were recorded at different times or on different devices, which is exactly when this problem shows up.

Because the joins are the only part worth checking. The preview stitches together the end of each track and the start of the next, so you hear every transition in a few seconds instead of playing an hour-long compilation to find out whether track three lands correctly. The middle of each file is untouched by the join, so there is nothing to listen for there.

Yes — an MP3, a WAV and an M4A can go into the same join without converting anything first. They are decoded, joined, and written out as one MP3. Differences in sample rate or channel count are handled for you, so you do not need the files to match in any way before uploading.

As many as you like, provided they add up to 10 MB together rather than each — that total is the limit worth watching. If you are over it, Compress Audio will shrink the individual files first, or Trim Audio will cut them down to the parts you actually need. The tool is free, with no sign-up and no watermark.

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