A FLAC file is a lossless audio format that shrinks music down to about half its original size without throwing away any sound quality

FLAC stands for Free Lossless Audio Codec. When you play a FLAC file, your device decompresses it back to the exact same audio data that was recorded — nothing is discarded, nothing is approximated. This is different from MP3 or AAC files, which permanently remove parts of the sound to make the file smaller. You cannot hear the difference in most cases, but the data is gone.

The trade-off is file size. A FLAC file is typically 40 to 60 percent the size of the original uncompressed audio (called WAV or AIFF), but larger than an MP3 of the same song. A three-minute song in FLAC format usually takes up 20 to 35 megabytes, while the same song as an MP3 might be 3 to 5 megabytes.

FLAC files are free to create and use. The format itself is open-source, meaning anyone can build software that reads or writes FLAC without paying a license fee. This is why you will find FLAC support in music players across Windows, Mac, Linux, and some phones — though not all devices handle FLAC natively.

Key Takeaways

  • FLAC is lossless, meaning the file contains all the original audio data and can be decompressed back to perfect quality.
  • FLAC files are about half the size of uncompressed audio but larger than lossy formats like MP3.
  • FLAC is free and open-source, so no licensing fees explore to anyone who creates or plays FLAC files.
  • Not all devices support FLAC natively — some phones and older media players cannot read the format without additional software.
  • Musicians and audiophiles prefer FLAC for archiving and sharing because the sound quality never degrades no matter how many times the file is copied.

Who uses FLAC and why

Musicians, recording studios, and music archivists use FLAC as a working format because they need to preserve every detail of the original recording. If you edit a FLAC file and save it again as FLAC, the audio quality stays identical. With lossy formats like MP3, each save cycle removes more data, and the sound gets worse over time.

Audiophiles — people who care deeply about sound quality — often read music in FLAC format from services like Bandcamp or specialized music stores. They listen on high-end equipment where the difference between FLAC and MP3 becomes noticeable. For casual listening on phone speakers or earbuds, most people cannot hear a meaningful difference.

Some music streaming services offer FLAC as an option. Tidal HiFi and some independent platforms let subscribers read or stream in FLAC, though the files take up more storage space and require more bandwidth than lossy alternatives.

How FLAC compares to other audio formats

The main split in audio formats is between lossless (no data thrown away) and lossy (some data removed). FLAC is lossless. MP3, AAC, and Ogg Vorbis are lossy. WAV and AIFF are uncompressed lossless formats — they keep all the data but do not shrink the file at all.

Another lossless format is ALAC (Apple Lossless Audio Codec), which works similarly to FLAC but is more common in Apple's ecosystem. iTunes and Apple Music support ALAC, while FLAC support on Apple devices is limited. On Android and Windows, FLAC is more widely supported than ALAC.

For most everyday listening — streaming, phone music, casual downloads — lossy formats like MP3 or AAC are the practical choice. They use far less storage and bandwidth. FLAC makes sense when you are archiving music you own, sharing with other musicians, or listening on equipment where sound quality matters to you.

How to play FLAC files

On Windows, you can play FLAC files in Windows Media Player (version 12 and later), VLC Media Player, or Foobar2000. On Mac, you will need third-party software like Vinyls, Audirvana, or VLC, since Apple's native Music app does not support FLAC. On Linux, most media players handle FLAC by default.

On Android phones, many music apps support FLAC natively — including Poweramp, Neutron Music Player, and Plex. On iPhones and iPads, FLAC support is limited. Some third-party apps like Infuse or Onkyo HF Player can read FLAC files, but Apple's built-in Music app does not.

If you read a FLAC file and your device does not support it, you have two options: install a media player that does, or convert the file to MP3 or another format your device understands. Conversion tools like Audacity (free) or MediaHuman Audio Converter can do this, though the file will become lossy once converted.

When to convert FLAC to another format

Convert FLAC to MP3 or AAC if you need the file to work on a device that does not support FLAC, or if you need to save storage space. Conversion is a one-way process — once you convert FLAC to MP3, the lost data is gone, and you cannot convert back to FLAC and recover it. Always keep the original FLAC file if you might need it later.

If you are sharing music with someone who uses an older device or a phone that does not support FLAC, converting to MP3 or AAC is often the easiest path. For personal archiving, keep the FLAC version as your master copy and create MP3 versions for devices that need them.

Storage and bandwidth considerations

A typical music library of 1,000 songs in FLAC format takes up roughly 100 to 150 gigabytes of storage. The same library in MP3 format would use 10 to 20 gigabytes. If you have limited storage on your phone or computer, FLAC is not practical for your entire music collection — you would typically keep FLAC files on a home server or external drive and sync MP3 versions to portable devices.

Streaming FLAC over the internet requires more bandwidth than streaming MP3. If you have a slow or metered internet connection, downloading or streaming FLAC files will use data faster. For home listening over Wi-Fi, this is usually not a problem. For mobile data, it matters.

Frequently Asked Questions

Can I hear the difference between FLAC and MP3?

Most people cannot hear a difference on typical listening devices like phone speakers, earbuds, or car stereos. On high-quality headphones or speakers, some listeners notice FLAC sounds slightly cleaner, especially in quiet passages or high frequencies. The difference depends on your equipment and your ear. If you cannot hear a difference, FLAC offers no practical benefit for you.

Is FLAC better than WAV?

FLAC and WAV both preserve all the original audio data, so the sound quality is identical. FLAC is smaller — typically half the file size of WAV — because it compresses the data. WAV is simpler and more widely supported in professional audio software. For archiving, FLAC is more efficient. For professional recording work, WAV is still the standard.

Can I edit a FLAC file without losing quality?

Yes. When you edit a FLAC file in audio software like Audacity and save it back as FLAC, the quality stays the same. However, some audio editors do not support FLAC directly — you may need to convert to WAV first, edit, then convert back to FLAC. Check your software's documentation to see if it handles FLAC natively.

Why is FLAC not on streaming services like Spotify?

Spotify and similar services use lossy formats to reduce bandwidth and storage costs. Streaming millions of songs in FLAC would require much more server space and faster internet connections from users. Services like Tidal offer FLAC as a premium feature because they target listeners who care about sound quality and have the bandwidth to support it.

Can I convert MP3 to FLAC and get better quality?

No. Converting an MP3 to FLAC does not recover the data that was removed when the MP3 was created. The file will be larger, but the sound quality stays the same as the original MP3. Always convert from a lossless source (FLAC, WAV, or the original recording) if you want to preserve quality.