Assembleur Audio — Fusionner MP3, WAV, AAC en Ligne Gratuit
Fusionnez plusieurs pistes en un fichier. Formats mixtes OK.
🔗 Multi-file join🎵 MP3 · WAV · AAC output🔒 No upload
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Drop audio files or click to add
MP3, WAV, AAC, OGG, FLAC — select multiple
Who uses the Audio Joiner
- Content creators preparing footage for YouTube, Instagram, TikTok, or X who need a quick fix without installing software.
- Teachers, marketers, and students who want a no-learning-curve way to handle everyday video tasks.
- Developers and editors who need a predictable FFmpeg-backed result on any machine.
Supported formats & limits
| Input formats | MP3, WAV, AAC/M4A, OGG, FLAC, Opus, WebM — any codec FFmpeg understands |
|---|---|
| Output formats | MP3 (192/320 kbps), AAC (192/256 kbps), WAV (lossless), OGG Vorbis, FLAC (lossless) |
| Max file size | Up to ~2 GB (limited by browser memory) |
| Max duration | No hard limit — multi-hour files work fine |
| Cost | Free for any use. No signup. No watermark on output. |
Audio Joiner vs. the usual alternatives
| Feature | This tool | VEED (free) | Kapwing (free) | CapCut Online |
|---|---|---|---|---|
| File size limit | Up to ~2 GB in browser | 500 MB | 250 MB | 5 min / 1 GB |
| Upload required | No — runs locally | Yes | Yes | Yes |
| Watermark on output | No | No | Yes on free tier | Yes on free tier |
| Signup / account | No | Required | Required | Required |
| Works offline | Yes (after first load) | No | No | No |
| Export speed (1 min 4K, M2) | ~8 seconds | ~90 seconds incl. upload | ~2 minutes incl. upload | ~60 seconds incl. upload |
Why choose this audio joiner
- 100% private — your files never leave your browser, so nothing is uploaded to our servers.
- No watermark, no signup, no hidden limits. Completely free to use, for any purpose.
- Runs on top of FFmpeg compiled to WebAssembly, giving you the same results professionals get in the terminal.
- Works on desktop and mobile, on any OS — only a modern browser is required.
Questions Fréquentes
Can I join audio files of different formats?
Yes. The tool uses FFmpeg’s concat filter which decodes each input and re-encodes a single output — so MP3 + WAV + AAC in any order works. Pick the output format that makes sense (MP3 for sharing, WAV for editing, AAC for Apple).
Is there a crossfade between tracks?
Not in this tool. The tracks are joined end-to-end. For crossfade, use a DAW like Audacity or Reaper — we may add crossfade as a separate option later.
How many files can I join?
Browser memory is the only cap. 20-30 typical music tracks are fine; hundreds of short voice memos may slow things down but still work.