Format guide
What is FLAC?
Free Lossless Audio Codec is a Free Lossless Audio Codec that shrinks audio without discarding samples, created by Xiph.Org / Josh Coalson (2001). FLAC gives you WAV-level fidelity at a smaller size with solid tagging — ideal for audiophile libraries and Bandcamp-style downloads. Convert to MP3 or AAC for maximum phone and car compatibility.
FLAC format specifications
- Full name
- Free Lossless Audio Codec
- Kind
- audio
- File extension
- .flac
- MIME type
- audio/flac
- Developer / standard
- Xiph.Org / Josh Coalson · 2001
- Compression
- codec-dependent
- Quality model
- Lossless
- Container
- No / single bitstream typical
- Common codecs
- FLAC
- Technical sources
- Xiph.Org: FLAC format
- Transparency
- Not supported
- Animation
- No (still / non-animated typical use)
- Typical size
- Typically 30–60% smaller than WAV
- Browser support
- Supported in several browsers; convert when in doubt for Safari-centric users
- Compatibility
- Excellent on desktops and many modern phones; convert to MP3/AAC for older cars, boutique players, and stubborn apps
FLAC compression & quality
FLAC compression: codec-dependent. Lossy encoding discards some information to shrink files — re-saving repeatedly can accumulate artifacts. Typical size profile: Typically 30–60% smaller than WAV. Quality note: Lossless — bit-identical to source PCM after decode
Quality: Lossless — bit-identical to source PCM after decode
Typical size: Typically 30–60% smaller than WAV
Transparency & animation
FLAC does not support an alpha channel. Convert to PNG, WebP, AVIF, or SVG when you need transparent backgrounds.
FLAC is a still-media or non-animated format in typical use. Use GIF, APNG, video, or animated WebP when you need motion.
FLAC metadata
Tags such as ID3, Vorbis comments, or MP4 atoms (title, artist, album, artwork).
Best use cases for FLAC
- Lossless music archives
- Vinyl/tape rips
- High-quality album distribution
- Storage between WAV sessions
- Collector libraries
When to avoid FLAC
- Ultra-low-bandwidth streaming
- Ancient phones/car decks without support
- Speech-only podcasts where Opus/AAC is enough
- Tiny MMS-style attachments
Advantages
- Lossless with real savings
- Rich tags and art
- Open and royalty-free
- Better than WAV for large collections
Disadvantages
- Larger than lossy codecs
- Gaps on older devices
- Overkill for voice notes
- Encode time vs copying WAV
Compatibility
Excellent on desktops and many modern phones; convert to MP3/AAC for older cars, boutique players, and stubborn apps
Browsers: Supported in several browsers; convert when in doubt for Safari-centric users
Software support
- VLC
- foobar2000
- MusicBrainz Picard
- Many DAWs
- Format Convertly
Device support
- PCs, modern phones, some network streamers
- Modern desktops
- Phones and tablets with compatible apps
How to open FLAC
Play FLAC in VLC, foobar2000, or a modern phone music app. After moving libraries between disks, spot-check tags and album art before deleting the WAV masters.
How to convert FLAC
Keep FLAC as the archive and derive MP3 or AAC in Format Convertly for portable listening — conversion stays on-device so music libraries are not uploaded.
Popular FLAC conversions
Convert to FLAC
Incoming conversions strengthen the FLAC cluster — e.g. JPG → FLAC, PNG → FLAC.
FLAC comparison guides
Compare FLAC with related formats to pick the right container for quality, size, and compatibility.
Best format guides featuring FLAC
Decision pages that cite FLAC — the next hop after a vs comparison.
Related formats
FLAC tools
Tools extend the format graph beyond one-off conversion — compression, metadata, and utilities for real workflows.
Technical sources
- FLAC Format Specification — Xiph.Org
FLAC FAQ
What is a FLAC file?
FLAC is a Free Lossless Audio Codec that shrinks audio without discarding samples. FLAC gives you WAV-level fidelity at a smaller size with solid tagging — ideal for audiophile libraries and Bandcamp-style downloads. Convert to MP3 or AAC for maximum phone and car compatibility.
Is FLAC lossy or lossless?
FLAC is typically lossy (codec-dependent). That keeps files small but means discarded detail cannot be restored later.
Does FLAC support transparency?
FLAC does not support an alpha channel. Convert to PNG, WebP, AVIF, or SVG when you need transparent backgrounds.
How do I open a FLAC file?
Play FLAC in VLC, foobar2000, or a modern phone music app. After moving libraries between disks, spot-check tags and album art before deleting the WAV masters.
How do I convert FLAC privately?
Keep FLAC as the archive and derive MP3 or AAC in Format Convertly for portable listening — conversion stays on-device so music libraries are not uploaded. Format Convertly keeps processing in your browser so files are not uploaded to a conversion server.
Are my FLAC files uploaded on Format Convertly?
No. FLAC conversion runs in your browser. Files are not sent to Format Convertly servers for processing.