MP3/WAV/M4A merger with drag-order control — runs on-device via FFmpeg.

How to use

1. Add 2+ audio files → order them.
2. Optional: normalize loudness.
3. Merge → MP3/WAV download.

About this tool

Stitch interview parts, podcast segments, voice memos or songs into one file. Add as many tracks as you like, drag them into order, and merge — the FFmpeg concat engine runs locally through WebAssembly, so even a two-hour result never leaves your device. Optional loudness normalization evens out volume jumps between sources before the join. Your file never leaves this page — processing runs in your browser via WebAssembly; nothing is uploaded and the file is dropped from memory when you close the tab.

FAQ

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