For a long time I struggled to find an online audio converter that didn’t require uploading files to a remote server, creating an account, or tolerating endless popups and ads.
So I decided to build my own:
Free Audio Converter Online — a lightweight tool that runs 100% in the browser using FFmpeg compiled to WebAssembly.
🎯 What it does:
- Convert audio files between MP3, WAV, OGG, FLAC, AAC
- Support for batch conversion
- Choose bitrate, sample rate, channels, and compression mode
- Files are never uploaded — everything happens locally
⚙️ Tech stack
- FFmpeg compiled to WASM
- JavaScript + Tailwind CSS
- Runs entirely client-side, no server logic
- Simple ZIP packaging for multiple outputs
✅ Why?
Because privacy matters — and audio conversion should be instant, simple and offline when possible.
🔗 Try it here:
👉 https://freeaudioconverteronline.com
I'd love any feedback, suggestions or testing help!
P.S. If you've worked with audio in the browser or FFmpeg via WASM, I'd love to hear what you've built too!
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