Audio Joiner

Merge audio files into one — free, joined at zero crossings so there is no click.

100% in your browser — nothing is uploaded

Audio Joiner

This free audio joiner merges several audio files into a single continuous track. Add the files, drag them into the order you want, and export one file — useful for stitching podcast segments recorded separately, assembling a DJ mix from individual tracks, combining voice takes into one narration, joining a jingle to an advert bed, or putting a multi-part audiobook chapter back together. The joiner concatenates at the sample level rather than re-encoding each part, so a join between two files of the same format and sample rate is seamless rather than audibly stitched. Where files differ in sample rate or channel count, they are matched before joining, which is what prevents the pitch and speed errors you get from naive concatenation. Nothing is uploaded: the merge runs in your browser using the Web Audio API, so unreleased or client material stays on your machine. If a boundary between two parts sounds abrupt, trim a few milliseconds off the end of the first file before joining — most audible joins are caused by a cut landing mid-waveform rather than at a zero crossing.

How to use the free audio joiner

1
Add the files
Drag in two or more audio files. They are decoded locally in your browser.
2
Set the order
Reorder the parts until the sequence is right, and preview the joins.
3
Export one file
Download the merged track as a single file, with no watermark and no account.

Made for AI music creators

Assembling podcast segments, chaining generated sections into a longer piece, or building a continuous mix? Join the parts here, then trim or convert the finished file in the same session.

Audio Joiner: what people search for

Searched as an audio joiner, an audio joiner online, an online audio joiner, an mp3 merger, an audio combiner, a song merger, and as the task itself — combine mp3 files, join two songs together, "how to merge two audio files". All of them describe concatenation, and all of them hit the same failure: a click at the join, which comes from cutting mid-waveform instead of at a zero crossing.

Audio Joiner at a glance

Runs: Entirely in your browser
Uploads: None — files never leave your device
Account: Not required
Cost: Free, no watermark
Output: Lossless WAV where audio is exported
Works offline: After the page has loaded

Why it works this way

The audio joiner runs on your machine

This free audio joiner merges several audio files into a single continuous track. Add the files, drag them into the order you want, and export one file — useful for stitching podcast segments recorded separately, assembling a DJ mix from individual tracks, combining voice takes into one narration, joining a jingle to an advert bed, or putting a multi-part audiobook chapter back together.

A free audio joiner with no signup

Assembling podcast segments, chaining generated sections into a longer piece, or building a continuous mix? Join the parts here, then trim or convert the finished file in the same session.

What the audio joiner handles

The cases people actually bring to it.

Add both files to the audio joiner, drag them into the order you want and export. The result is a single continuous file, produced in your browser without an upload.
Yes. Files are decoded first, so an MP3 and a WAV can be merged. Differences in sample rate and channel count are matched before joining so nothing shifts in pitch or speed.
A click happens when a cut lands mid-waveform instead of at a zero crossing. Trim a few milliseconds off the end of the first file, or add a very short fade, and the join becomes inaudible.
The practical limit is your device’s memory rather than a server quota. Long lossless files consume more memory than compressed ones of the same duration.

Who uses it

Who reaches for the audio joiner

Producers

A quick answer mid-session without opening a DAW project.

DJs

Checking a track before it goes into a set.

Video editors

Preparing audio to sit under a cut.

Students

Learning what the numbers mean by watching them change.

Audio Joiner — frequently asked questions

How do I merge two audio files into one?

Add both files to the audio joiner, drag them into the order you want and export. The result is a single continuous file, produced in your browser without an upload.

Can I join files of different formats?

Yes. Files are decoded first, so an MP3 and a WAV can be merged. Differences in sample rate and channel count are matched before joining so nothing shifts in pitch or speed.

Why can I hear a click where two files meet?

A click happens when a cut lands mid-waveform instead of at a zero crossing. Trim a few milliseconds off the end of the first file, or add a very short fade, and the join becomes inaudible.

Is there a limit on how many files I can join?

The practical limit is your device’s memory rather than a server quota. Long lossless files consume more memory than compressed ones of the same duration.

Does joining audio reduce quality?

Not if you export to a lossless format — the samples are concatenated as they are. Exporting to a lossy format applies one encode to the finished file, which is far better than re-encoding each part.

Are my files uploaded anywhere?

No. The merge runs entirely in your browser, so nothing is transmitted or stored on a server.

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