Audio Joiner — Merge MP3, WAV or M4A In Your Browser

How to use

1. Add 2+ audio files — each is decoded locally for its duration.
2. Reorder with the up/down arrows; remove strays with ✕.
3. Pick MP3 192k, WAV or M4A output.
4. Merge — the engine loads once (~30 MB) — and download.

About this tool

Stitch a mini-podcast, a DJ mini-mix or a voice-memo chain without uploading a thing. Add two or more audio files, set their order with the up and down buttons, and choose an output format: MP3 at 192 kbps, lossless WAV or M4A (AAC). Under the hood the tool feeds FFmpeg's concat demuxer and re-encodes every track into one consistent stream — that re-encode is deliberate, because it normalizes different bitrates, sample rates and containers instead of producing a glitchy stream copy. The list shows each file's size and decoded duration, with a running total so you know what you are committing to, and it warns when you mix container types. The conversion engine loads once (~30 MB) and then runs locally. Your file never leaves this page — processing runs entirely in your browser; nothing is uploaded and the data is dropped from memory when you close the tab.

FAQ

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Your rating stays in this browser (local storage) — nothing is sent to any server.