Convert MP4 to FLAC online
Free, no sign-up, no limits. Drop your MP4 files, get FLAC files back in seconds.
1 files converted so far
Drop your MP4 files here
or · multiple files accepted
Local conversion: your files never leave your device.
Why convert MP4 to FLAC?
You want to keep only the sound of a video: lecture, concert, course, interview, the music from a clip. The resulting file is 10 to 20 times smaller and plays on any player.
How to do it, step by step
- Drop your MP4 fileinto the area at the top of the page (or several files at once). On mobile, tap the area and pick the file from your apps.
- Check the output format: FLAC is already selected. FLAC is a lossless format: there is no quality setting, the sound is reproduced identically. The file will be noticeably larger than a compressed format.
- Start the conversion.The FFmpeg engine loads once (≈ 10 MB), then each file is processed in a few seconds without leaving your device.
- Download your FLAC, directly or as a .zip if you converted several files. The name and metadata (title, artist, cover art) are preserved.
The MP4 format (MPEG-4 (video audio track))
MP4 is a video file. Extracting its audio track lets you keep only the sound of a lecture, a concert, an interview or a personal video, in a much smaller file you can listen to anywhere.
- Universal video format
- Large
- Pointless when only the sound matters
The FLAC format (Free Lossless Audio Codec)
FLAC compresses audio with zero loss: the file is 40 to 60% the size of the original WAV but reproduces exactly the same sound. It is the format of choice for audiophiles and music archives. It is free, open, and supports metadata and cover art.
- Quality identical to the original
- Free and open format
- Supports tags and cover art
- Files 5 to 10 times larger than an MP3
- Not played by Apple devices without a third-party app
MP4 vs FLAC comparison
| MP4 | FLAC | |
|---|---|---|
| Compression | Lossy | Lossless |
| Typical size (1 min, music) | ≈ 20–100 MB | ≈ 5 MB |
| Common use | smartphone videos, lectures, concerts, online courses | CD archiving, audiophiles, Bandcamp, Qobuz |
| Metadata (title, cover art) | Yes | Yes |
Frequently asked questions
Does converting MP4 to FLAC lose quality?
No: FLAC is a lossless format. The sound of the converted file is strictly identical to that of the original MP4, but the quality already lost during MP4 compression is not recovered.
Is the MP4 to FLAC converter free?
Yes, with no limit on the number of files, no sign-up and no watermark. Each file can be up to 200 MB.
Are my MP4 files uploaded to the internet?
No. The MP4 to FLAC conversion is performed by FFmpeg directly in your browser (WebAssembly). Your files never leave your computer or phone.
How do I convert MP4 to FLAC on iPhone or Android?
Open this page in Safari or Chrome, tap the drop area, select your MP4 file (from Files, Voice Memos, Downloads or WhatsApp), then tap "Convert". The FLAC downloads to your files.
Can I convert several MP4 files at once?
Yes, add all your files in one go. They are converted one after another and a button lets you download everything as a .zip archive.