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Merge Audio

Merge Audio joins several tracks into one continuous file, with an optional crossfade between clips for smooth transitions. Combine voice notes, songs or sound effects — even in different formats — into a single MP3 or WAV, all processed locally.

01

Add your audio file

The file is read by your browser and stays on your device — there is no upload step.

Merge Audio

Add tracks, order them, and join into one file.

02

Your audio

The work runs in this tab. Nothing is sent anywhere, and the download is generated locally.

Add 2+ tracks

How to use Merge Audio

  1. 01
    Upload

    Add your tracks

    Drop two or more audio files in and arrange them in the order to play.

  2. 02
    Customize

    Set a crossfade

    Optionally add a crossfade duration so each clip blends into the next.

  3. 03
    Process

    Merge

    Choose MP3 or WAV and export the combined track.

Building the combined track

  1. 01
    Add your files

    Drop in every recording that belongs in the finished audio.

  2. 02
    Set the order

    Arrange them into sequence — chapters, takes, or segments in the order they should play.

  3. 03
    Listen across the joins

    The transitions are where mismatched rooms and levels announce themselves.

  4. 04
    Export

    One continuous file is written in that order.

When the files do not match

  • Different loudness

    The most common complaint about merged audio. Levelling each file first is the single thing that makes a compilation sound deliberate.

  • Different rooms

    Two takes recorded in different spaces will not blend, however well the levels match — the reverb changes at the join and the ear notices immediately.

  • Mono and stereo together

    Mixing channel counts forces a single output format. A mono file placed among stereo will sit dead centre while everything else has width.

Worth checking first

  • Trim the ends — Count-ins, chair scrapes and the click of a stop button all end up in the middle of the finished file.

  • Normalise first — Levelling before merging is easier than fixing one loud section inside a long combined file.

  • Add short fades — A few milliseconds at each join removes clicks where waveforms do not meet at zero.

Supported formats

  • MP3
  • WAV
  • M4A
  • OGG
  • FLAC
Maximum file size —
bounded by your device's memory
Processed by —
FFmpeg (WebAssembly), on your device

Your file, and what the page does

Your file is never uploaded. Merge Audio reads it into this browser tab and processes it with FFmpeg compiled to WebAssembly on your own device. There is no upload endpoint in the application and no copy on any server — closing the tab discards it.

That is also why processing takes longer here than on a site that uploads: your device is doing the work rather than a rack of servers. The trade is that the file never leaves it.

What the page does send or fetch

The processing engine, once
The first time you use any video or audio tool, the browser downloads the FFmpeg WebAssembly build (~30MB) from the jsDelivr CDN and reuses the cached copy afterwards. That is a file coming to you — no part of your own file is in the request.
Ads on the page
The site is funded by advertising, so the page loads Google AdSense. That carries the usual web basics — IP address, browser, referring page — as on any ad-supported site.
An anonymous usage counter
When Merge Audio finishes we record that the tool ran, whether it succeeded and how long it took. No file data, no identifier, no cookie.

Your file is not on that list. How this works.

Frequently asked questions

Yes — mixed formats are resampled to a common rate so they join seamlessly.

It overlaps the end of one clip with the start of the next for a smooth, gap-free transition.

You can export the combined track as MP3 or WAV.

Yes — Merge Audio is completely free. There's no account, sign-up, watermark or limit.

No. It runs in any modern browser — Chrome, Edge, Safari, Firefox, Brave — with nothing to download or install.

Not sure merging is what you need?

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