Uwarp

Merge 2–10 clips end-to-end. The first run downloads FFmpeg once in this browser. Processing stays on your device.

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Merge M4A files online

Merge M4A files or combine MP3 clips into one track online. Free audio merger. Local-first. No signup.

What is an audio merger?

An audio merger joins two or more clips end-to-end into one file. Use Merge M4A files here when you have several .m4a (or MP3/WAV) parts and need a single download. Processing uses FFmpeg in the browser.

Merge audio features

Combine M4A and other audio clips into one file.

  • Merge M4A files

    Join several .m4a clips into one continuous M4A track.

  • Combine mixed formats

    Add MP3, WAV, AAC, OGG, or FLAC alongside M4A.

  • Reorder before merge

    Move clips up or down so the join order matches your sequence.

  • M4A, MP3, or WAV output

    Pick the download format after the clips are queued.

  • Local-first

    Processing stays in the browser with FFmpeg WebAssembly.

How to merge M4A files

Combine audio clips in three steps.

  1. Upload the clips

    Add 2–10 audio files (M4A, MP3, WAV, and related formats).

  2. Set order and format

    Reorder with Up / Down and choose M4A, MP3, or WAV output.

  3. Merge and download

    Click Merge audio, then save the combined file.

Tips for merging audio

What helps when clips refuse to join cleanly.
  • 01

    Keep a consistent loudness

    Very quiet and very loud clips will still join; boost volume first if needed.

  • 02

    Prefer the same sample rate when you can

    This page normalizes to 44.1 kHz stereo, so mixed sources still work.

  • 03

    Trim first if you need cuts

    Use Cut Audio to trim each clip, then merge the results.

Great for

When one continuous audio file is easier than a folder of clips.

  • Podcast parts

    Combine M4A interview segments into one episode file.

  • Voice note compilations

    Merge several phone recordings into a single track.

  • Lesson or chapter audio

    Join chapter M4A files before uploading to a course or player.

Why merge audio here

A free local merger for M4A and related formats.

  • No signup

    Merge clips without creating an account.

  • Stays on your device

    Encoding runs in the browser.

  • M4A-first workflow

    Built for combine M4A / merge M4A searches, with MP3 and WAV output too.

Technical details

How this audio merger works.
Input
2–10 files: M4A, MP3, WAV, AAC, OGG, or FLAC, each up to 200 MB.
Normalization
Each clip is rewritten as AAC stereo at 44.1 kHz before concat.
Output
M4A (AAC copy after normalize), MP3 (LAME 192 kbps), or WAV (PCM 16-bit).
Where it runs
FFmpeg WebAssembly on your device. Files are not uploaded to merge.

Sources & References

References for the formats this merger reads and writes.
  • “The MPEG-4 (MP4) container format can contain a number of different types of video and audio.”
    — MDN Web Docs — Media container formats (file types)

    MDN — Media container formats: An .m4a file is typically that MPEG-4 container with audio only. This tool joins such clips into one download. developer.mozilla.org/en-US/docs/Web/Media/Guides/Formats/Containers

  • “This demuxer reads a list of files and other directives from a text file and demuxes them one after the other, as if all their packets had been muxed together.”
    — FFmpeg documentation — Concat demuxer

    FFmpeg concat demuxer: After each clip is normalized, this page uses that concat approach to join them in order. ffmpeg.org/ffmpeg-formats.html#concat

Frequently Asked Questions

Quick answers about this tool—open a question to read more.