Audio Converter — Free Online MP3, WAV, AAC & FLAC Converter, No Upload
Convert audio between MP3, AAC, OGG, OPUS, FLAC, and WAV — or extract audio from a video. Free, no upload, runs in your browser.
Your computer does 100% of the processing — not a server, not the cloud.
FFmpeg runs directly inside your browser via WebAssembly. Your audio files never leave your device. No upload, no cloud service — your own CPU handles everything.
- ✓Files stay on your computer — zero upload, zero cloud
- ✓Completely private — no account, no logging of your files
- ⚠First use downloads ~32 MB FFmpeg engine — cached after that
Drop an audio file here or browse files
MP3 · WAV · AAC · M4A · OGG · FLAC · OPUS · and more
Also accepts video files — audio track will be extracted
Free Online Audio Converter — 100% Local, No Upload
This converter uses FFmpeg compiled to WebAssembly, running entirely in your browser. Your audio files never leave your device.
Related: Audio Compressor to reduce file size, or Video to Audio for dedicated video audio extraction.
Frequently Asked Questions
Is the Audio Converter free?
Yes — completely free. No account, no subscription, and no file size limit.
Are my audio files uploaded to a server?
No. FFmpeg runs locally in your browser via WebAssembly. Your files never leave your device.
Do I need an account?
No account, no login, and no signup required.
Can I extract audio from a video file?
Yes. Drop any MP4, MOV, MKV, or WebM file and choose an audio output format. The converter strips the video track and exports the audio.
What formats are supported?
Input: MP3, WAV, FLAC, AAC, OGG, OPUS, M4A, and video files (MP4, MOV, MKV, WebM). Output: MP3, AAC, OGG, OPUS, FLAC, WAV.
Will converting between lossy formats degrade quality?
Yes. Converting MP3 to AAC, for example, re-encodes compressed audio — artifacts from the first encoding get baked in again. Convert from a lossless source (FLAC, WAV) when quality matters.