Audio Merger

Merge two or more audio files into a single MP3, in a reorderable sequence, using FFmpeg compiled to WebAssembly. Runs entirely in your browser.

🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.

Choose two or more audio files

How it works

Can I merge different audio formats together, like an MP3 and a WAV?

Yes — each file is decoded individually and re-encoded into a single consistent MP3 output, so mixed input formats merge together without issue.

Can I change the order the tracks play in?

Yes — use the ↑ and ↓ buttons next to each file to reorder them before merging. The tracks join in the order shown, top to bottom.

Does merging add a crossfade or gap between tracks?

No — tracks are joined end-to-end with no gap or crossfade, so the last moment of one track is immediately followed by the first moment of the next.

Is my audio uploaded anywhere?

No — merging runs with FFmpeg compiled to WebAssembly, entirely inside your browser tab. Your files never leave your device.

Feature	Online Tool Store	Audio editing software	Online audio joiners
No file upload — runs in your browser	✓	✓	Uploads to a server
No install	✓	Software install required	✓
No watermark	✓	✓	Free tier often limited

For a quick "just stitch these clips together" task, this skips both the software install and the upload step.