Convert any MP3 file to FLAC — free, private, entirely in your browser.
Click "Start Converting — Free" to launch the converter in your browser.
Drag and drop your MP3 file or click to browse. Choose FLAC as the output format.
Conversion runs locally via WebAssembly. Download your FLAC file instantly.
Files never leave your device. MP3→FLAC conversion is 100% client-side.
No registration, no watermarks, no usage limits — ever.
Uses open-source FFmpeg compiled to WebAssembly for native-speed conversion.
Works in Chrome, Firefox, Edge, and Safari on desktop and mobile.
Convert multiple files using the built-in queue without reloading the page.
Yes. AnyConvert uses open-source FFmpeg via WebAssembly — no cost, no sign-up, no limits.
No. All conversion happens in your browser using WebAssembly. Your files never leave your device.
There is no server-side limit. The practical limit depends on your device's available memory — most files under 500 MB work fine.
No. FLAC cannot restore quality lost in MP3 compression. The file will be larger in a lossless container, but audio quality stays the same as the source MP3.
Some workflows require FLAC files specifically (e.g., certain DAWs, archiving systems, or audio pipelines). This converter wraps MP3 audio into a lossless FLAC container.
Open AnyConvert in your mobile browser, select your MP3 file, choose FLAC as output, and download. No app needed.