FLAC to ALAC
Apple Music, iTunes and iPhones do not play FLAC files, but they do play ALAC, Apple's own lossless format. Turn FLAC files into ALAC with nothing lost. It all happens on your own device.
How to use it
- Choose your FLAC files, or drag a whole album onto the box.
- Each one is converted to ALAC on your device.
- Download each M4A file, or all of them together as a ZIP file, and add them to Apple Music.
Nothing is lost
FLAC and ALAC are both lossless, so the ALAC file holds exactly the same sound, sample for sample. The original sample rate and bit depth are kept: 16-bit files stay 16-bit, and 24-bit files at 96 kHz stay 24-bit at 96 kHz. ALAC files end with .m4a, like other Apple music files, and are usually a little larger than the FLAC.
Song details
Titles, artist and album names, track and disc numbers, the year and the genre are copied into the new file. Cover pictures are not carried over; Apple Music can add artwork afterwards.
How it works
The conversion uses the Apple Lossless encoder that is part of the open-source FFmpeg, inside FilePresto's own small converter. It downloads once, about 0.7 MB, before your files are opened, and nothing is sent anywhere afterwards. Its source code and build instructions are on the licences page.
Questions
Are my files uploaded?
No. The work happens inside your web browser, on your own device. Before your file is opened, this page locks itself: from then on your browser refuses to let it fetch, upload or send anything at all. You can check: once the page has loaded, switch off your internet connection and it will still work. How the lock works.