Convert to FLAC, Free
Files convert instantly in your browser. 100% private, any file size, no account needed.
Drop your FLAC file here
or click to browse. Any file size.
Conversion runs entirely in your browser. Your file never leaves your device.
How to convert to FLAC
FLAC (Free Lossless Audio Codec) compresses audio without discarding any data, making it ideal for archiving and high-fidelity listening. Unlike MP3 and AAC, which throw away audio information to achieve compression, FLAC reduces file size using lossless algorithms and perfectly reconstructs the original PCM audio on playback. Converting any audio format to FLAC gives you a lossless copy, but only if the source is lossless (WAV, AIFF, PCM) or in a higher-quality lossy format. The conversion runs in your browser using WebAssembly-compiled FFmpeg, so your files never leave your device.
If you are converting from a lossy format (MP3, AAC, OGG) to FLAC, the result is a lossless container around lossy audio: the FLAC file will be larger than the MP3 but will not sound any better. This is sometimes called a 'transcoded FLAC' or 'lossy FLAC'. The only situation where converting lossy-to-FLAC makes sense is when you need a specific container format for a device or archive system, knowing the audio quality was set at the earlier lossy encoding step.
Upload your audio file
Drop a WAV, AIFF, MP3, M4A, OGG, or any other audio file. WAV and AIFF produce true lossless FLAC; lossy sources produce lossless containers around lossy data.
Choose FLAC compression level
Levels 0-8 balance encoding speed against file size. Level 5 (default) is a good tradeoff. All levels are lossless; higher levels produce smaller files but take longer to encode.
Convert locally
The WebAssembly FFmpeg instance processes the file in your browser. No upload to any server occurs.
Download the FLAC
Save the .flac file to your music library or archive storage. FLAC plays natively in most media players.
Frequently asked questions
Does converting MP3 to FLAC improve sound quality?
No. FLAC is lossless, but it preserves whatever audio information was present in the source. An MP3 that has already discarded data cannot recover that data by being placed in a FLAC container.
What should I use as a lossless source for FLAC conversion?
WAV, AIFF, or PCM audio from a CD rip or digital audio workstation are genuinely lossless sources. These convert to FLAC with no quality loss at all.
What is the difference between FLAC compression levels?
All 9 levels (0-8) are lossless. Level 0 is fastest to encode with larger files. Level 8 is slowest with the smallest files. For most uses, level 5 is the practical default.
Which devices support FLAC playback?
Most Android devices, major audio players (VLC, foobar2000, Winamp, Plex), many modern car infotainment systems, and NAS-based music servers. Apple devices support FLAC since iOS 11 / macOS High Sierra.
How big is a FLAC file compared to WAV and MP3?
FLAC is typically 40-60% smaller than an equivalent WAV file. It is 3-5x larger than an MP3 at 128 kbps. For a CD-quality album: WAV ~700 MB, FLAC ~300-400 MB, MP3 ~100 MB.