What is the Audio Converter tool?
Convert voice recordings, WhatsApp voice notes, call recordings and music into the format you need. Choose bitrate for quality vs size, and optionally trim the start and end.
How to use Audio Converter
- Drop audio files.
- Choose format and bitrate.
- Convert.
- Download.
Why use this audio converter?
- Play WhatsApp Opus voice notes anywhere
- Convert call recordings (AMR) to MP3
- Make ringtones
- Shrink large WAV recordings
Tips for the best results
- MP4 (H.264) is the safest video format for phones and social media.
- Trim long recordings to the part you need to save time and space.
- The first conversion downloads the engine once; later ones start instantly.
Works well with
People who use the Audio Converter often need these tools too:
- Video to MP3 — Extract the audio from MP4, MOV, MKV, AVI, WebM and other videos and save it as MP3 — perfect for waz, lectures, songs and podcasts.
Key features
Private by design: how this converter works
Unlike typical online converters that upload your file to a remote server, this Audio Converter converter processes everything on your own device using FFmpeg compiled to WebAssembly — the same engine used by professional video tools. Your file is read into browser memory, converted, and offered back as a download — it is never sent to us.
- No upload wait — conversion starts instantly, even on slow mobile data.
- Private — safe for NID copies, certificates, bank statements and personal photos.
- No limits — no daily quota, no queue and no watermark.
- Offline-ready — once loaded, many tools keep working without internet.
Frequently asked questions
What bitrate should I choose?
128 kbps is fine for voice, 192–320 kbps for music.
Is Audio Converter free to use?
Yes. It is completely free, with no account, watermark or usage limit.
Does it work on mobile phones?
Yes. It is fully responsive and works in all modern mobile browsers. You can also add it to your home screen as an app.