Fast Audioconvertor Free

Local Windows audio convertor with a no-build web UI and FFmpeg under the hood.

What you need

• Windows 11
• Python 3.11 or newer
• FFmpeg and FFprobe (https://www.ffmpeg.org/download.html)

No extra Python packages are required. The server uses only the Python standard library. Python downloads for Windows: python.org/downloads/windows

Quick start

.\start_audio_convertor.cmd

or run the server directly:

python .\server.py

The app opens a local page in the browser and serves the UI at http://127.0.0.1:8421.

FFmpeg setup

The app first looks for local binaries in tools/ffmpeg/bin. If they are not there, it falls back to ffmpeg and ffprobe from PATH. Official FFmpeg download page: ffmpeg.org/download.html

Portable layout:

AudioConvertor/
  server.py
  start_audio_convertor.cmd
  web/
    index.html
    styles.css
    app.js
  config/
    settings.json
  tools/
    ffmpeg/
      bin/
        ffmpeg.exe
        ffprobe.exe

If Python is missing, the starter script stops immediately with an error. If FFmpeg or FFprobe is missing, the starter script prints a warning and the web UI shows a startup warning. The UI still opens, but conversion stays disabled until both tools are available.

Features

• batch queue with one active conversion at a time
• presets for MP3, AAC / M4A, FLAC, WAV PCM 16-bit, WAV PCM 24-bit, WAV PCM 32-bit, WAV Float 32-bit, OGG, and OPUS
• input via native Windows file and folder pickers
• output next to the source file or into a shared folder
• progress, logs, cancellation, and persisted local settings
• dark theme web UI