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 audio

    Drop a file into the Audio Joiner or record straight in your browser. Nothing is uploaded — it runs on your device.

  2. 2

    Edit and adjust

    Trim, convert, tune the EQ, fades and levels, then preview instantly.

  3. 3

    Export or transcribe

    Download the result free, or turn it into a searchable transcript with one click.

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. AuTrans's joiner concatenates files end-to-end without inserting any silence. If you need a crossfade, mark it explicitly per file pair.
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?
Up to 20 files per session on free. Pro users can merge up to 100 files in a batch.
What's the total size limit?
Combined input up to 500 MB on free, 2 GB on Pro. The joined output respects whatever output format and bitrate you choose.
Can I crossfade between files?
Crossfade is a Pro feature, set the crossfade length per join point (default: 1 second). Free users get gap-free concatenation.
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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Get 30 minutes of free transcription every month. No credit card required. Just upload your audio and go.

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