Audio Merger
Join multiple audio files into one
What is Audio Merger?
Audio Merger is a free online audio tool from Farvixo that lets you join multiple audio files into one. Decoding and encoding both happen in your browser through WebAssembly, so recordings, interviews and voice notes never reach a server. Free and unlimited, with no watermark or audible tag added to the output.
How to use Audio Merger
Add an audio file to Audio Merger. Processing runs locally in your browser, so your recordings are never uploaded.
Pick the format, bitrate and sample rate you need, or use a preset tuned for music, podcasts or voice notes.
Convert and download the finished file. Quality is yours to control and nothing is added to the output.
Frequently Asked Questions
Do the files need to be the same format?
No. Mixed formats are decoded and re-encoded to a single output. Files that already share a format and bitrate can often be joined without re-encoding, which is faster and lossless.
Why do the volume levels jump between tracks?
Recordings made at different times almost always differ in level. Enable loudness normalisation so the whole merged file sits at one consistent EBU R128 target rather than lurching between sections.
Can I add gaps or crossfades between files?
Yes. A short gap suits spoken word, where an abrupt join sounds jarring; a crossfade suits music. Either is better than a hard cut between two different recordings.
Is my audio uploaded?
No. Decoding and encoding both run in your browser, which matters for interviews and voice notes.
Is there a limit on total length?
No imposed limit. Since everything is processed locally, the constraint is your device memory — hours of audio merge fine on an ordinary laptop.
What you can use Audio Merger for
- Fitting a podcast episode or voice note under a messaging or email size limit
- Converting a recording to the format a player, DAW or upload form requires
- Journalists and researchers handling interview audio that must stay private
- Preparing audio for a video edit at a consistent bitrate and sample rate
Audio Merger at a glance
- Tool
- Audio Merger — Audio Tools
- Purpose
- Join multiple audio files into one
- Input
- One or more files (MP3, WAV, M4A, AAC, FLAC, OGG, Opus)
- Output
- Audio file in the selected format and bitrate
- Processing
- In your browser — files are never uploaded to a server
- Price
- Free, unlimited, no account required
- Limitations
- Bounded by your device's memory and CPU rather than a server quota; very large files may be slow on older hardware
Tips for better results
- Speech is fine in mono — downmixing halves the file size with no perceptible loss on voice content.
- For spoken word, 64–96 kbps is transparent; music generally needs 128 kbps or more.
- Every lossy re-encode loses information. Always start from the highest-quality original you have, not from a file you already compressed.
Common problems and how to fix them
The file will not load
The container is fine but the codec is unusual, or the file is partially downloaded. Re-download the original and try again.
The output sounds thin or watery
The bitrate is too low for the material. Raise it a step, and keep stereo if the source is music rather than speech.
Volume is inconsistent across the file
Enable loudness normalisation, which levels the track to a single EBU R128 target instead of leaving the peaks and quiet passages as they were.
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