Converting FLAC to MP4 gives you a much smaller file. It runs in your browser: nothing is uploaded, there is no queue and no size limit.
What changes when you convert FLAC to MP4
- FLAC is lossless and MP4 is not. Expect a much smaller file and a very small, usually invisible, loss of detail. Keep the FLAC if you may edit again.
- Video needs pictures, so we render a waveform animation from the sound. The result posts anywhere that only accepts video.
When to convert, and when not to
Convert to MP4 for sharing video with anyone, anywhere. H.264 video and AAC audio. Plays on absolutely everything.
Keep FLAC for archiving music losslessly. Lossless compression, about half the size of WAV.
How to convert FLAC to MP4
- Drop your FLAC file on the converter above, or click to choose. Several at once is fine.
- Check the options if you need them: video quality.
- Click Convert, then Download. Nothing was sent anywhere, your browser did the work.
Questions
Is my FLAC file uploaded?
No. The conversion runs in your browser with WebAssembly. There is no upload endpoint on this site. You can open your browser's Network tab, or go offline after the page loads, and it still works.
Is there a file size limit?
No fixed one. The limit is your device's memory: a large audio file on a phone is slower than on a laptop, but nothing is rejected for being big.
Is it free?
Yes, without an account, without a daily cap and without a watermark. Your device does the computing, so there is no server bill to pass on.
Will the quality drop?
MP4 is lossy, so a little detail is traded for a smaller file. At quality 85 the difference is invisible on photos. For graphics with sharp edges, prefer a lossless format such as PNG.
Can I convert several files at once?
Yes. Drop them all; each is converted in turn and you can download them one by one or as a single ZIP.
Which engine does the conversion?
Media engine (FFmpeg, multithreaded WebAssembly), compiled to WebAssembly and running in your browser, on all your CPU cores when the browser allows it. First use downloads about 31 MB, cached afterwards.