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Audio Format Converter

What is this tool?

A browser-based audio format converter. It runs a full ffmpeg build compiled to WebAssembly, so the conversion happens on your device — no upload, no size cap beyond your browser's memory.

When to use it

  • Converting a voice memo or recording to MP3 for sharing
  • Getting a WAV from a compressed file for editing
  • Making an OGG or M4A for a specific app or platform
  • Extracting the audio track from a video file
  • Standardising a folder of mixed-format audio

How to use it

  1. 1Drop in an audio or video file
  2. 2Pick the target format
  3. 3Click Convert — the first run downloads the ffmpeg core (~30 MB), then it's cached
  4. 4Preview the result in the player
  5. 5Download the converted file

Frequently asked questions

Why is the first conversion slow?

It downloads the ffmpeg WebAssembly core once (~30 MB). After that it's cached and conversions start immediately.

Does converting to MP3 lose quality?

MP3, OGG and M4A are lossy, so re-encoding always loses a little. WAV and FLAC are lossless.

Can it pull audio out of a video?

Yes — drop in the video and it extracts and converts the first audio track.

Is my file uploaded?

No — ffmpeg.wasm runs entirely in your browser tab.