How to use it
- Add your files. Drop MP4 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
Only the sound track is kept: it is taken out of the MP4 and saved as FLAC. The video is discarded, so the file is much smaller.
About MP4 and FLAC
MP4: MP4 is the most widely supported video format: phones, browsers, TVs and every editor play it.
FLAC: FLAC is lossless audio: the exact sound of a CD at about half the size of WAV.
Questions
Is my MP4 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 MP4 files at once?
Yes. Drop as many as you like, a folder or a ZIP; “Download all” saves every FLAC in one ZIP.