Drop your file here
MP3 · WAV · FLAC · AAC · OGG · M4A
Drop an audio track below. Sonic processes it locally — your files never touch a server.
Drop your file here
MP3 · WAV · FLAC · AAC · OGG · M4A
Drag and drop any audio track into the zone above — MP3, WAV, FLAC, AAC, OGG, M4A all work as input.
Choose output format (MP3 or WAV), bitrate, and volume adjustment.
Click Process and download your converted audio file directly — no server queue, no waiting.
Conversion starts instantly — no waiting to upload a large file to a remote server.
Your files never leave your machine. No server to breach, no logs to leak.
Cloud tools cap free users at 100 MB. Sonic uses your device's memory — no artificial limits.
Once the page loads, Sonic works completely offline. No internet required for conversion.
Convert WAV masters to MP3 for distribution. Pick the right bitrate per platform — 320 kbps for quality, 128 for podcasts.
Convert lecture recordings to MP3 to save storage and listen on the go.
Convert between MP3 and lossless WAV instantly, privately, without touching a server.
Handle sensitive audio without exposing files to external cloud servers.
Sonic accepts any audio format your browser can decode — MP3, WAV, FLAC, AAC, OGG, M4A and more. Output is MP3 or WAV.
No. Everything runs inside your browser. Your file is read into memory, processed locally, and downloaded directly to your device.
For most files, no. Very large files may cause a brief pause during encoding — this is a browser limitation, not a bug.
Completely free. No account, no watermarks, no limits. Sonic is part of the RuntimeHub ecosystem of free, privacy-first browser tools.