How to use it
- Add your files. Drop MP3 files on the page or use Choose files. Folders and ZIPs work too.
- Check that FLAC is selected. FLAC is already chosen on this page.
- Adjust options if you need to. Quality, size and other settings appear when the format has them.
- Convert and download. Press Convert; with several files, “Download all” gives you one ZIP.
What happens to your file
The audio is decoded and encoded as FLAC without any loss.
Converting to a lossless format keeps the sound exactly as it is in the source; it cannot add back detail an earlier lossy encoding removed.
About MP3 and FLAC
MP3: MP3 is the universal audio format: every phone, car stereo and app plays it.
FLAC: FLAC is lossless audio: the exact sound of a CD at about half the size of WAV.
Questions
Is my MP3 file uploaded?
No. The conversion runs inside this browser tab, and the FLAC is created on your device. Nothing is sent to a server.
Is there a file size limit?
No fixed limit: files are processed by your device, so very large videos depend on its memory. Computers handle several GB; phones are best with smaller files.
Can I convert several MP3 files at once?
Yes. Drop as many as you like, a folder or a ZIP; “Download all” saves every FLAC in one ZIP.