Audio
WAV vs FLAC: Same Sound, Different Size
WAV and FLAC sound exactly the same. Both are lossless, so FLAC is just WAV squeezed without losing anything. In our test the FLAC files were roughly one quarter to one fifth the size. Use WAV for editing and exchange with studios, FLAC for storing and listening.
Is FLAC lossless, and does it sound different from WAV?
FLAC stands for Free Lossless Audio Codec, and the name is accurate. It compresses the audio the way a ZIP file compresses a document: smaller on disk, identical when unpacked. WAV is uncompressed PCM, the raw samples in a simple wrapper.
We checked this rather than assume it. We converted a WAV to FLAC, decoded it back, and hashed the decoded audio of both with ffmpeg. The two hashes were identical, so not one sample changed. If a store or app tells you FLAC sounds “warmer” or “worse” than WAV, the difference is in the playback chain, not the file.
How much smaller is FLAC than WAV?
| Clip (16-bit, 44.1 kHz stereo) | WAV | FLAC | FLAC as share of WAV |
|---|---|---|---|
| 20 s tone and noise mix | 3,528,078 bytes | 861,225 bytes | about 24% |
| 5.6 s synthetic speech | 974,750 bytes | 174,112 bytes | about 18% |
Both clips are synthetic, so your music will land somewhere else. Quiet, sparse recordings shrink a lot. Loud, dense or noisy recordings shrink less, because there is less redundancy to remove. Expect FLAC to be smaller every time, with the amount varying by track.
One more thing we saw: Apple’s
afconvertWhat else is different between WAV and FLAC?
| WAV | FLAC | |
|---|---|---|
| Compression | None | Lossless |
| Size | Largest | Much smaller |
| Tags (artist, album, art) | Limited, inconsistent between apps | Built-in tag and cover art support |
| 4 GB file limit | Yes, from the format design | No |
| Plays in QuickTime and Quick Look on a Mac | Yes | Yes on current macOS |
| Pro DAWs and broadcast delivery | The standard | Often accepted, not always |
| Edit speed | Fastest, no decoding | Slightly slower, decoding needed |
The practical split: DAWs, podcast editors and clients who ask for “a WAV” want WAV. Your archive and your listening library are better as FLAC, with proper tags and a fraction of the disk space.
Should I use WAV or FLAC?
- Recording and editing: WAV. Every tool opens it and nothing needs decoding.
- Delivering to a studio, mastering house or broadcaster: WAV unless they ask for FLAC.
- Archiving a CD rip or purchased lossless album: FLAC.
- Sending a file to a friend: neither. Use a lossy file such as MP3 or M4A and the transfer is a tenth of the size. Our guide to compressing audio explains the trade-offs.
Remember that lossless only protects what you start with. A FLAC made from an MP3 is a large copy of an MP3, not an upgrade.
Do bit depth and sample rate change the WAV vs FLAC answer?
No. Both formats can store the same resolutions: 16-bit at 44.1 kHz is CD quality, and 24-bit at 48 kHz or 96 kHz is common in studios. The format only decides how the samples are stored. A 24-bit 96 kHz WAV is roughly three times the size of a CD-quality WAV of the same length, and FLAC shrinks both.
Higher resolution helps while you record and process, since it leaves headroom. For listening it makes little audible difference. If space is the problem, dropping a finished track from 24-bit to 16-bit costs far less than going lossy, and you can keep the studio file as FLAC.
Mac users who live in Apple software sometimes choose Apple Lossless (ALAC in an M4A file) instead of FLAC. It is also lossless and compresses by a similar order of magnitude. Choose it only if every device you use is Apple. FLAC is the safer choice for everyone else.
How do I convert WAV to FLAC on a Mac?
macOS can do it without extra software. In Terminal,
afconvertafconvert song.wav song.flac -f flac -d flacTo go back, use the same command with the extensions swapped and
-f WAVE -d LEI16When is Smol the wrong tool for this?
For one or two files,
afconvertSmol earns its $29 (once, one Mac) with a folder of mixed audio: it converts between WAV, FLAC, M4A, MP3 and OGG, compresses with a bitrate from 16 to 512 kbps, runs from a Finder right-click, and nothing is uploaded. It is not a tag editor and does not repair damaged files. See pricing or the best audio converter for Mac.
How we checked this
Encoded a 20 s synthetic tone mix and a 5.6 s macOS speech clip (16-bit, 44.1 kHz stereo) from WAV to FLAC with ffmpeg and afconvert, compared sizes, and hashed decoded audio with ffmpeg. Facts last checked . We make Smol, so treat our claims about it with the same care as any vendor’s, and see our editorial policy.
WAV vs FLAC: common questions
Is FLAC better than WAV?
For storage, yes: same audio in about a quarter to a fifth of the space in our test, plus proper tags and cover art. For editing and delivering to studios, WAV is still the standard because it needs no decoding and every tool accepts it.
Does converting WAV to FLAC lose quality?
No. FLAC is lossless. We decoded a FLAC back to audio and its hash matched the original WAV exactly, so every sample was preserved. You can convert back and forth any number of times without damage.
Is FLAC the same quality as a CD?
A FLAC made from a CD rip holds the exact CD audio, 16-bit at 44.1 kHz, just stored in less space. FLAC can also hold higher resolutions such as 24-bit, but it cannot add detail that the source never had.
Can a Mac play FLAC?
Yes. Current macOS plays FLAC in QuickTime Player and Quick Look, and Terminal can convert it with afconvert. Some older apps and many car stereos do not play it, in which case use WAV or a lossy MP3 or M4A.
Why is my FLAC file barely smaller than the WAV?
Loud, dense or noisy recordings have little redundancy, so lossless compression saves less. Quiet, sparse audio shrinks the most. Check by comparing the two sizes in Finder; FLAC should still be smaller, even if only by a little.
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