FLAC Converter Free & Private
Lossless audio compression — perfect quality, half the size. Convert FLAC Audio files entirely in your browser — no upload, no account.
About FLAC Audio
FLAC (Free Lossless Audio Codec) compresses audio without any quality loss — every bit is preserved, but files are typically 50-60% smaller than equivalent WAV files. It's the gold standard for audiophile music collections, high-resolution audio distribution, and archival. FLAC is completely open-source and royalty-free.
Technical details
| Container | FLAC (.flac) or Ogg container |
| Video codecs | N/A (audio only; may embed cover art) |
| Audio codecs | FLAC (Free Lossless Audio Codec) |
| Max resolution | N/A |
| Streaming | Supported by some streaming services (Tidal, Amazon HD) |
| Metadata | Vorbis comments (title, artist, album, cover art, ReplayGain) |
Best for
Audiophile music collections, lossless archival, high-resolution audio
Advantages
- Mathematically lossless — bit-perfect reproduction
- 50-60% smaller than uncompressed WAV
- Open source and completely royalty-free
- Excellent metadata and cover art support
Limitations
- Still much larger than lossy formats (3-5× larger than MP3)
- Not supported by all portable devices
- Some older car stereos and Bluetooth speakers don't support FLAC
Convert FLAC to other formats
FLAC compatibility
Android, most modern media players, Plex, VLC, foobar2000; iOS via Files app; some car stereos
Why privacy matters for file conversion
Most online converters upload your files to remote servers where they may be scanned, stored, or shared. This tool is different — the conversion runs in your browser via WebAssembly or the WebCodecs API. Your files stay on your device. Always.
Brought to you by
Love keeping your files private? Utterly brings the same philosophy to audio. Transcribe meetings, lectures, and voice memos — entirely on your iPhone, iPad, or Mac.
Frequently asked questions
At 320kbps MP3 vs FLAC, most people cannot distinguish them in blind tests. The real value of FLAC is archival — you can always convert FLAC to MP3 later, but you can never recover quality lost to MP3 compression.
Yes, completely free with no file limits. The conversion engine runs directly in your browser — we have zero server costs for processing, so we can offer it at no charge.
Your file never leaves your device. The conversion engine runs 100% in your browser using WebAssembly or the WebCodecs API. We have no access to your files — no uploads, no logs, no data collection whatsoever.
On desktop browsers (Chrome, Firefox, Edge) files up to 500 MB convert reliably. On Safari (macOS) the practical limit is around 200 MB. On iPhone and iPad, keep files under 50 MB — iOS enforces tight memory limits for browser-based processing.
On your first visit, the browser downloads the conversion engine (24–50 MB depending on which backend is used). This is cached locally, so subsequent conversions load much faster.
Chrome, Edge, and Brave use hardware-accelerated WebCodecs when the format is supported — this is 5–10× faster than software encoding. For unsupported formats the tool falls back to ffmpeg.wasm, where Firefox typically performs best.
Utterly is a privacy-first transcription app for Apple devices. It uses on-device AI to transcribe and translate audio — no cloud, no subscription required to start. This free converter is brought to you by the Utterly team.