How to convert a FLAC to WAV on a Mac

Converting a FLAC file to WAV on a Mac loses no quality at all. FLAC is a compressed but lossless format, so decoding it to WAV produces the exact same audio samples the file started with, just stored uncompressed. The fastest way is to drop the FLAC on a converter set to WAV: the new file is noticeably larger, but everything you hear is bit-for-bit identical.

What FLAC and WAV actually are

Both FLAC and WAV are lossless: they preserve every sample of the original recording, unlike MP3 or AAC, which throw data away to save space. The difference is compression.

WAV is essentially raw audio. It stores each sample of each channel as an uncompressed number, in a format called PCM. Nothing is packed or predicted, so a WAV file is large and trivial for any device to read. Because it is so simple, WAV is the format audio software has understood for decades, from editing suites and samplers to CD-burning tools and older hardware.

FLAC, the Free Lossless Audio Codec, takes that same PCM audio and compresses it, typically to somewhere between half and two-thirds of the WAV size, without discarding a single sample. It does this the way a zip file does: by finding patterns and storing them efficiently, in a way that can be perfectly reversed. When you play a FLAC, the player decodes it back to the original PCM on the fly.

So a FLAC and a WAV made from the same recording contain the same audio. FLAC just carries it in a smaller package.

Why the conversion is lossless, and what does change

Because FLAC compression is perfectly reversible, converting FLAC to WAV is a decode, not a re-encode. The converter unpacks the FLAC back to raw PCM and writes that PCM into a WAV wrapper. The samples that come out are the identical numbers that went in when the FLAC was created. There is no generational loss, no artifacts, nothing to tune. A WAV made this way and the original recording are the same audio.

That is different from converting to a lossy format. If you turned the FLAC into an MP3, the encoder would permanently discard detail to shrink the file. WAV discards nothing, so the only thing that genuinely changes is the size on disk and how the file carries its labels, which the sections below cover.

The practical reason to make the switch is compatibility. Plenty of tools read WAV instantly but stumble on FLAC: some audio editors, mastering and CD workflows, game engines, hardware samplers, and older playback devices. If a program will not open your FLAC, handing it a WAV almost always solves the problem, and you lose no fidelity doing so.

Convert a FLAC to WAV, step by step

macOS can play a FLAC, so a Quick Look preview in Finder will let you hear one. What macOS will not do is convert it for you. The Music app is the usual place to change an audio format on a Mac, through File then Convert, but Music refuses to import FLAC in the first place, so that route is closed. There is no built-in Apple app that turns a FLAC into a WAV.

Manatee does the conversion locally and keeps the original untouched. You can start it three ways: drag the FLAC onto the Manatee icon in the menu bar, drop it into the app window, or right-click the file in Finder and choose Fix with Manatee.

1. Open Manatee and choose Convert.
2. Pick WAV as the target format.
3. Drop in your FLAC, or a whole folder of them. Each file appears in the job list with progress.
4. The new WAV is written alongside the original, in the same folder. Your FLAC is left exactly as it was.

Everything runs on your Mac. Nothing is uploaded, there is no account, and Manatee bundles its own conversion engine, so there is nothing else to install. Because a FLAC to WAV conversion is a straight decode, it is fast even for a full album, and batching a folder is the same few clicks as a single file.

What you give up: size, tags, and the 4 GB ceiling

The obvious cost is disk space. A WAV holds the audio uncompressed, so expect it to be roughly one and a half to two times the size of the FLAC. For a single song that is a few extra megabytes; for a large library it adds up quickly. This is the trade you are making on purpose: you accept a bigger file to get a format everything can read.

The less obvious cost is metadata. FLAC stores tags cleanly: title, artist, album, track number, and embedded cover art all live inside the file in a well-supported way. WAV was designed long before that was standard, and its tagging is inconsistent. Some programs read basic information from a WAV, many ignore it, and embedded artwork often does not survive at all. If your FLAC is neatly tagged and you care about keeping those labels, know that a WAV may show up in a player as an untitled track. That is a limitation of the WAV format itself, not of any one converter.

There is one more ceiling worth knowing. The classic WAV format uses a 32-bit field to record its own size, which caps a standard WAV at about 4 GB. For ordinary songs and most recordings that is irrelevant. For very long high-resolution captures, a single continuous recording can bump into that limit, in which case a container like FLAC is actually the more practical home for the audio. For everyday files, you will never notice it.

Questions

Will converting FLAC to WAV improve the sound quality?

No, and nothing could. FLAC already holds every sample of the original, so WAV cannot add detail that was never lost. The two files sound identical. You convert for compatibility and for software that expects uncompressed audio, not for fidelity.

Can I convert the WAV back to FLAC later without losing anything?

Yes. Since the WAV is a perfect copy of the audio, re-encoding it to FLAC gives you back a lossless file that is, sample for sample, the same recording. You can move between the two as often as you like with no degradation, which is the whole point of lossless formats.

Why is my WAV so much bigger than the FLAC?

Because WAV stores the audio without compression while FLAC packs it down. The size difference is expected and is not a sign that anything went wrong. If disk space is the priority, keep the FLAC; if a specific program or device needs WAV, the larger file is the price of compatibility.

My audio editor will not open FLAC. Is converting the right fix?

Usually, yes. Many editors and older tools read WAV natively but not FLAC. Converting to WAV gives them the exact same audio in a format they understand, with no quality loss, so it is the correct and safe fix rather than a workaround.