Autrans
Free tool

Audio Joiner

Merge multiple audio files into one. MP3, WAV, M4A, OGG, FLAC. Up to 20 files, free, browser-based.

Combine up to 20 audio files into a single track. Drop them in the order you want them stitched, pick the output format, download. Useful for joining recording segments, building DJ mixes, or merging multi-part voice notes before transcription.

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100% in your browser, your files never leave your device. Free, no sign-up.

How it works

How to use the Audio Joiner

  1. 1

    Add your files in order

    Drop in the audio files you want joined, formats can be mixed (MP3 + WAV + M4A in one merge). Everything stays on your device.

  2. 2

    Arrange the sequence

    Drag the files into the order you want them stitched. The joiner concatenates end-to-end with no gap and no silence inserted.

  3. 3

    Merge and download

    Pick the output format and download one continuous track, or merge multi-part voice notes and transcribe the whole thing in one pass.

Need a transcript?

Once you've cleaned up your audio, Autrans turns it into a searchable transcript with speaker labels, summaries, and exports to TXT, DOCX, PDF, SRT, and VTT. Built for African languages: Nigerian English, Pidgin, Yoruba, Hausa, Igbo, plus French and Spanish.

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Frequently asked

Questions, answered

Can I join audio files gap-free?
Yes. The joiner concatenates files end-to-end without inserting any silence between them.
Can I mix formats (MP3 + WAV + M4A) in one merge?
Yes. The joiner re-encodes each input to match the first file's sample rate and channel count, then outputs in your chosen format.
How many files can I merge at once?
Add as many as you like and drag them into the order you want. Everything is joined in your browser, so the practical limit is your device's memory rather than a number we set.
What's the total size limit?
Combined input up to 50 MB with no account, and up to 500 MB on Pro. The joined output uses whatever format and bitrate you choose.
Can I crossfade between files?
Not currently. The joiner concatenates end-to-end with no gap and no overlap. If you need a crossfade, join the files here and then apply it in an audio editor.
Can I rearrange the order of files before joining?
Yes, drag-and-drop reordering in the browser before you hit Merge. The output respects whatever final order you set.
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All part of Autrans's free audio toolbox, quick, private, browser-based tools for the everyday audio jobs creators and teams actually do: cut, convert, compress, join, record. No sign-up, no watermarks, nothing leaves your device.

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