Audio mixer

Overlay two audio tracks — music under a voice memo, two takes together — each with its own volume.

Audio stays in this browser. Files are decoded, summed sample-by-sample, and written as one WAV — nothing is uploaded.

Two files, 200 MB each; combined decoded PCM within 256 MiB (about 12 min stereo at 44.1 kHz). The browser cannot know a file's decoded size until it is decoded, so that check runs right after decoding. Output is 16-bit WAV at track A's sample rate, stereo or mono. When the sample rates differ, track B is linearly resampled — audible quality is basic. Mixing different-length tracks pads the shorter one with silence.

How to use

  1. Choose track A and track B.
  2. Set each volume and the clipping option.
  3. Mix and download the WAV.

What it supports

Two files ≤ 200 MB each, decoded in-browser; combined decoded PCM ≤ 256 MiB. Output is 16-bit WAV at track A's sample rate; track B is linearly resampled when rates differ. Shorter tracks pad with silence. Gains 0–4×; optional peak limiting.

Related tools

Related guides