What is a FLAC file?
Learn how FLAC delivers bit-perfect lossless audio at half the size of WAV files, where it is supported, and how to convert it quickly right in your browser. Free FLAC converters included.
FLAC, which stands for Free Lossless Audio Codec, is an open-source audio format introduced by Xiph.Org in 2001. Before its release, music lovers and sound engineers faced an awkward compromise between massive uncompressed WAV files and lossy formats like MP3 that permanently discarded delicate acoustic details. FLAC was created to eliminate this trade-off by offering an open, royalty-free standard that preserves every bit of the original studio master while substantially reducing storage demands. Today, it serves as the universal benchmark for master recording preservation and high-fidelity distribution worldwide.
Unlike lossy encoders that apply psychoacoustic models to remove inaudible frequencies, FLAC uses linear prediction and Rice coding to compress pulse-code modulation data reversibly. This mathematical compression reduces file sizes to roughly 50 to 60 percent of an equivalent uncompressed WAV file, averaging about 5 to 6 megabytes per minute of CD-quality sound. The format acts as both codec and container, supporting sample rates up to 655.35 kilohertz with bit depths reaching 32 bits per sample across up to eight distinct audio channels, all with built-in checksum verification to detect corruption.
You encounter FLAC regularly across digital music stores, audiophile equipment, sound libraries, and streaming platforms that offer pristine resolution tiers. Modern operating systems including Windows, macOS, Android, and Linux provide native playback support out of the box. Major web browsers like Chrome, Firefox, and Safari 11 and newer can stream and decode FLAC streams natively without external plug-ins. Whether you are ripping compact discs, managing personal sound libraries, or preparing tracks for digital audio workstations, FLAC provides seamless compatibility alongside robust Vorbis comment metadata for track titles, artists, and embedded album artwork.
Technical specification
| Extension | .flac |
|---|---|
| MIME type | audio/flac |
| Compression | Lossless |
| Typical file size | 50-60% of WAV: 5-6 MB per minute |
| Browser and system support | Chrome, Firefox and Safari 11+ play it; the archival standard |
| Developed by / year | Xiph.Org, 2001 |
When to use it
- Choose FLAC when you want to archive physical CDs or master recordings with exact bit-for-bit fidelity while saving roughly 40 to 50 percent storage space compared to raw WAV files.
- Choose FLAC when you need rich, standardized metadata tags and embedded cover art that remain intact across different media players and operating systems.
- Choose FLAC when you are distributing high-resolution 24-bit audio tracks to audiophile listeners without introducing lossy compression artifacts.
- Choose FLAC when you require an intermediate production format that you can repeatedly edit, decode, and re-encode without accumulating any generational sound degradation.
When not to use it
- Avoid FLAC when you have strictly limited device storage or mobile bandwidth and need lightweight audio files; choose MP3 or M4A instead to save up to 80 percent more space.
- Avoid FLAC when you need guaranteed compatibility with legacy car stereos, older portable players, or default media players on vintage operating systems; convert to MP3 instead.
- Avoid FLAC when you are streaming audio across standard web applications with high concurrent traffic where smaller compressed formats like OGG or AAC provide faster load times.
Our tools for this format
23 tools that take FLAC files in or write them out. Each one runs in your browser, so nothing is uploaded.
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Common problems
Your default media player displays an unsupported format error when opening a FLAC file.
Older operating systems and legacy media players lack the native codecs required to unpack FLAC streams. You can resolve this immediately by converting the track into a universally compatible format like WAV or MP3 in your browser without uploading files to any external server. Alternatively, update your operating system or install a modern media player that includes built-in FLAC decoding libraries.
The FLAC file takes up too much storage space on your mobile device.
Because FLAC retains complete acoustic data, it averages 5 to 6 megabytes per minute and will rapidly consume portable storage. Convert your archival FLAC files into high-bitrate MP3 or M4A files at 256 or 320 kbps for everyday on-the-go listening. This conversion reduces the file size by roughly 70 to 80 percent while maintaining sound quality that is virtually indistinguishable to the human ear on mobile headphones.
Embedded album artwork or track metadata disappears when playing FLAC files on certain devices.
Some hardware players cannot read advanced Vorbis comment tags or large embedded cover images exceeding standard dimensions. Convert your files to M4A or MP3 with standard ID3 tags, or re-encode your FLAC files with embedded images resized to 500 by 500 pixels. Verifying that your player firmware supports Vorbis tags will also prevent track information from being ignored.
Audio editing software fails to import a 24-bit or 32-bit high-resolution FLAC track.
Certain audio workstations only accept uncompressed PCM audio or cannot parse FLAC headers with ultra-high sample rates above 192 kHz. Convert the FLAC file directly to a standard 24-bit uncompressed WAV file using an in-browser converter to ensure full compatibility. Because FLAC is completely lossless, converting it to WAV restores the original uncompressed stream with zero loss in quality.
Frequently asked questions
Does converting a FLAC file to WAV reduce audio quality?
No, converting from FLAC to WAV preserves 100 percent of the original audio quality. Because FLAC is a lossless format, decoding it reconstructs the identical pulse-code modulation data found in the uncompressed WAV container.
Can you improve MP3 quality by converting it into a FLAC file?
No, converting an MP3 to FLAC will not restore lost audio quality. Once lossy compression discards frequency data to reduce file size, that audio information is gone permanently, so encoding it into FLAC merely creates a larger file without improving clarity.
How much smaller is a FLAC file compared to an uncompressed WAV file?
A FLAC file typically measures 50 to 60 percent of the size of an equivalent uncompressed WAV file. For standard 16-bit 44.1 kHz stereo audio, FLAC averages between 5 and 6 megabytes per minute compared to roughly 10 megabytes per minute for WAV.
Do modern web browsers support playing FLAC audio directly?
Yes, modern web browsers including Google Chrome, Mozilla Firefox, and Apple Safari version 11 and newer support FLAC playback natively. You can play FLAC files directly inside these browsers using standard HTML5 audio tags without installing third-party plugins.
What is the difference between FLAC and ALAC?
FLAC is an open-source standard maintained by Xiph.Org, whereas ALAC is Apple's proprietary lossless format designed for native integration with Apple devices. Both formats provide identical, bit-perfect lossless compression at roughly similar file sizes.