How to convert AC3 to FLAC
- Add your .AC3 file - drop it in the box above or click to browse.
- Convert it to .FLAC in a few seconds.
- Download your new .FLAC file.
What to expect
- FLAC cannot improve source quality - it stores the PCM decoded from lossy AC3, so the output sounds identical to the source but takes up significantly more disk space.
- AC3 supports up to 5.1 surround channels; most tools preserve all channels in the FLAC output - explicitly request a downmix if you need stereo only.
- Standalone
.ac3files demuxed from DVD tracks may report unknown duration in some software; FFmpeg and the converter above handle them correctly.
Frequently asked questions
Will the FLAC file sound better than the original AC3?
No. FLAC is lossless but AC3 is lossy, so FLAC stores only what AC3 decoded - it cannot recover audio detail the original encoding discarded.
Why is the FLAC file so much larger than the AC3?
AC3 uses heavy perceptual compression (typically 192-640 kbit/s). Decoded PCM stored in FLAC is uncompressed audio, several times the size even after FLAC's own lossless compression.
Can I keep 5.1 surround in the FLAC output?
Yes - FLAC supports multichannel audio, and the conversion preserves all channels unless you specifically request a stereo downmix.
What if I need the audio for video or audio editing?
WAV is often the simpler choice: run
ffmpeg -i audio.ac3 audio.wav for a result identical in quality to FLAC but universally accepted by editing software.
