FLAC Compressor
Re-encodes losslessly at a higher compression level — same audio, smaller file.
Drop files, or click to browse
FLAC, WAV, and other audio files welcome
Frequently asked questions
What bitrate should I pick?+
128 kbps is a good balance for speech and casual listening; 192–320 kbps preserves more detail for music.
Is my file uploaded to a server?+
No — compression runs locally using your browser's own built-in media codecs, in your browser tab.
Is there a maximum file size?+
There's no fixed file-size limit since nothing is uploaded to a server. Processing time scales with the track's length rather than a hard cutoff.
How do I compress a FLAC?+
Drop your FLAC into the box above and pick a bitrate — a smaller file is ready to download as soon as encoding finishes.
About FLAC
What is FLAC?
FLAC is a lossless compressed audio format — same audio quality as WAV, but roughly half the file size thanks to genuine (not perceptual) compression.
Full FLAC format guide →A smaller FLAC file means faster uploads, faster page loads, and fewer headaches with size limits on email or messaging apps. The tradeoff is a small, controllable amount of audio quality, which you can dial in yourself.
How it works
- 1
Drop your file in
Drag your audio onto the box above, or click it to browse — there's no account to create and no upload to wait on.
- 2
Adjust the slider
Drag the quality slider and watch the estimated file size update in real time.
- 3
Download the result
Your browser processes everything locally and hands you a download link the moment it's done — nothing was ever sent to a server.
Is it private?
Everything happens locally, inside this browser tab. Your audio is read from disk, processed with WebAssembly running on your own device, and handed back to you as a download — it's never transmitted anywhere, so there's nothing to intercept and nothing stored on a server.
Common use cases
- Archiving music at full quality
- Audiophile listening
- Prepping a podcast episode for a hosting platform
- Fitting a voice memo under a messaging app's size limit
Supported formats
This is one of many pairings the audio toolkit handles. In total it covers:
Other compressors
Format details
About FLAC files+
FLAC is a lossless compressed audio format — same audio quality as WAV, but roughly half the file size thanks to genuine (not perceptual) compression.
FLAC (Free Lossless Audio Codec) was built by the Xiph.Org Foundation to solve a specific problem: WAV files are lossless but enormous, while MP3 and AAC are small but throw away audio data permanently. FLAC compresses audio the way a ZIP file compresses text — genuinely, reversibly, with zero data loss — typically landing at 50–60% of the original WAV size. That makes it the go-to format for anyone archiving music at full fidelity, at the cost of files still noticeably larger than a lossy MP3 or AAC.
How to open a FLAC file
Opens readily in VLC Media Player, Most modern phones and media players. For real editing, use Audacity (free).
Good for
- bit-perfect, lossless audio
- smaller than WAV for the same quality
Watch out for
- not supported by every device, though support is broad among dedicated audio players
Need another format? Try the full Audio Compressor, or explore all audio tools.