FLAC and WAV both store audio at full quality, but they do it in opposite ways. FLAC compresses the audio losslessly, so it is smaller while still perfect;[1] WAV stores raw PCM samples with no compression at all, so it is larger but needs no decoding.[3] Converting FLAC to WAV unpacks the compressed-but-lossless file into its plain, uncompressed form.
This is the rare conversion where you lose absolutely nothing in sound quality, because you are not changing the audio, only its packaging. Both formats end up holding exactly the same samples. What you are really trading is compactness for direct, decode-free access, which is precisely what some tools and hardware need.
What this conversion does
The converter decompresses the FLAC back into the exact PCM samples it was built from and writes them into a WAV container. Nothing is estimated, approximated, or discarded, because FLAC compression is fully reversible by design.[2] The result is a bit-for-bit copy of the original audio, just laid out uncompressed and therefore several times larger on disk. If you compressed that WAV straight back to FLAC, you would recover the identical file, which is the defining property of lossless coding.
FLAC to WAV and back is a round trip with no quality change at all. Both hold the same audio; only the packaging and file size differ.
Two ways to store the same lossless audio
To see why the conversion is free of quality loss, it helps to understand what each format actually contains. WAV is a container built on Microsoft's Resource Interchange File Format (RIFF). Inside, a small header describes the audio (sample rate, bit depth, channel count) and a data chunk holds the PCM samples one after another, exactly as they were captured, with no encoding step between the numbers and the file.[4] Reading a WAV is therefore trivial: any player can pull samples straight out and send them to the sound hardware.
FLAC takes those same PCM samples and compresses them with linear prediction. For each short block it fits a predictor, stores only the small residual between prediction and reality, and packs those residuals with Rice coding. The samples are never altered, only represented more compactly, which is why FLAC routinely reaches forty to sixty percent of the WAV size while remaining a perfect copy. The conversion between them is thus purely a matter of applying or reversing that predictive packing.
A useful way to picture the difference is that WAV writes out the full number for every sample, while FLAC writes down a rule that predicts the next number and then only the small correction needed to make the rule exact. Both descriptions define the same waveform without ambiguity; one is just more economical than the other. That is the whole basis of lossless compression, and it is why moving between the two costs nothing in fidelity.
Where FLAC and WAV came from
The two formats come from different eras and different priorities, which explains their split of roles today. WAV dates to the early 1990s, developed jointly by Microsoft and IBM as a straightforward way to store raw audio on the PC. Its designers deliberately kept it simple: wrap PCM samples in a RIFF container with a minimal header and get out of the way. That simplicity is exactly why WAV became, and remains, the universal interchange format for uncompressed audio, understood by essentially every audio program and operating system.
FLAC arrived later, in the early 2000s, as a free and open project aimed at a problem WAV never tried to solve: keeping audio perfectly intact while making the files meaningfully smaller. It was released under an open specification and reference implementation, which helped it become the de facto standard for lossless music distribution, archival, and high-resolution audio collections.[2] So the pair are complementary rather than competing: WAV is the simple, decode-free workhorse for editing and interchange, and FLAC is the compact, tag-rich container for storage. Converting FLAC to WAV is really just moving audio from the storage-optimized member of the pair to the editing-optimized one.
Lossless in, lossless out
This is the cleanest kind of conversion. Because both formats are lossless, the WAV you get is identical in quality to the FLAC, sample for sample. The only real cost is space: WAV cannot compress, so a FLAC that saved you room by packing the audio tightly expands back to full size in WAV. It is one of the few format changes where the word identical is literally true rather than a loose approximation: run the WAV back through a FLAC encoder and you recover the exact original file, byte for byte, which no lossy conversion can ever promise.
| Aspect | FLAC | WAV |
|---|---|---|
| Compression | Lossless, compact | None, uncompressed |
| Quality | Full | Identical to source |
| File size | Smaller | Larger |
| Needs decoding | Yes, to play or edit | No, reads directly |
| Metadata and tags | Rich, built-in | Limited, often lost |
That last row is worth noting: FLAC carries structured tags and even embedded cover art comfortably, while WAV's tagging support is minimal and inconsistent across software. Converting to WAV can therefore strip metadata that the FLAC held, which is another reason to keep the FLAC as the file you actually archive.
Inside the decode: prediction reversed to PCM
Mechanically, decoding a FLAC to WAV is the exact inverse of how the FLAC was made. The decoder reads each block, uses the stored predictor coefficients to regenerate the predicted samples, adds back the stored residuals to recover the true samples, and repeats for every block until the whole waveform is reconstructed. Because every one of those operations is exact integer arithmetic, no rounding error ever creeps in. The reconstructed PCM is then wrapped in a WAV header that records the sample rate, bit depth, and channel layout, and written out. The whole process is fast and deterministic, which is why FLAC to WAV runs quickly and produces an identical result every time.
Convert FLAC to WAV step by step
Add your FLAC file
Open the audio converter and drop in the FLAC. It runs on your device, so nothing is uploaded.
Choose WAV
Select WAV as the output. There is no bitrate to set, since WAV stores every sample uncompressed at the source bit depth.
Convert and download
Run it and download the WAV. Expect a larger file than the FLAC, with identical sound.
When WAV is worth the extra size
Convert FLAC to WAV when a tool needs uncompressed input. Some audio editors, samplers, game engines, DJ software, and older hardware either require WAV or handle it more reliably than FLAC. WAV also removes the small decoding step, which can matter for real-time playback or low-latency processing on limited devices, since the samples can be read directly with no codec in the path. Since the conversion keeps full quality, it is a safe way to make a lossless file work anywhere that expects raw PCM.
If you just want to store or play the audio, keep the smaller FLAC: it holds the same quality in less space and carries your tags. And remember that neither format is compact compared with lossy audio, so if small size is your priority, convert to a lossy format like MP3 instead.
It is worth being concrete about where the decode-free property of WAV actually pays off, because it is easy to overstate. On a modern computer, FLAC decoding is so cheap that you would never notice the difference in ordinary playback; the CPU cost is trivial. The cases where WAV genuinely helps are more specialized. Older or resource-constrained hardware, some embedded devices, and certain game engines may lack a FLAC decoder entirely or handle it unreliably, so they need raw PCM. Low-latency or real-time contexts, such as live sample triggering or DJ software cueing tracks instantly, benefit from having the audio ready to play with no decode step in the path. And some audio editors and mastering tools simply expect uncompressed input and behave more predictably with it. Outside those situations, the smaller FLAC is almost always the better file to keep, and reaching for WAV is a response to a specific tool's requirement rather than a general upgrade.
The size cost and the four-gigabyte ceiling
The practical downside of WAV is size, and in one case it is a hard limit rather than just an inconvenience. Because the classic WAV format stores chunk sizes in 32-bit fields, a standard WAV file cannot exceed roughly four gigabytes. For CD-quality stereo audio that is around six and a half hours, so most single tracks and albums are fine, but a very long recording, a high-resolution multichannel file, or a lengthy live set can bump into the ceiling. FLAC has no such limit, which is one more reason it makes a better archival container. If you do hit the wall, the fix is either to keep the source as FLAC or to split the audio into shorter WAV segments.
Bit depth, sample rate, and what carries over
Because the conversion is lossless, every technical property of the audio survives it unchanged, and it helps to know exactly what those properties are. Sample rate, the number of audio snapshots taken per second, carries over exactly: a 44.1 kHz FLAC becomes a 44.1 kHz WAV, and a 96 kHz high-resolution FLAC becomes a 96 kHz WAV. Bit depth, the precision of each sample, is preserved too, so 16-bit stays 16-bit and 24-bit stays 24-bit. The channel layout, whether mono, stereo, or multichannel, is likewise reproduced faithfully. None of these is a setting you tune during a FLAC-to-WAV conversion, because there is nothing to decide; the WAV simply inherits whatever the FLAC held.
What does not reliably carry over is metadata. FLAC stores tags such as title, artist, album, and even embedded artwork in a structured, well-supported way, whereas WAV's tagging is minimal and handled inconsistently across programs. A conversion to WAV can therefore quietly drop the tags the FLAC carried, which is one more reason to keep the FLAC as the file you archive and treat the WAV as a working copy for a tool that needs raw PCM. If preserving tags matters and your target can read them, staying on FLAC is the safer choice.
FLAC, WAV, AIFF, and lossy formats
WAV is not the only destination for a decoded FLAC, and knowing the neighbours helps you pick correctly. If you are on the Apple side of things, AIFF is the close cousin of WAV: it too stores uncompressed PCM and preserves full quality, differing mainly in byte order and in slightly better metadata support, and it is the format some Mac audio tools prefer. Choosing between WAV and AIFF usually comes down to which one your software or hardware expects, since the audio inside is identical either way.
If your real goal is a smaller file rather than uncompressed PCM, decoding FLAC to WAV is the wrong direction, because WAV is the largest option of all. In that case a lossy format is what you want: converting FLAC to AAC gives an efficient, Apple-friendly file, converting FLAC to MP3 gives maximum compatibility, and both shrink the audio to a fraction of even the FLAC. Reserve the FLAC-to-WAV path for the specific situation it is good at: feeding a tool that insists on raw, decode-free PCM while keeping every last bit of quality. For anything else, either stay on FLAC for storage or go lossy for size.
Convert FLAC to WAV now
Decompress your FLAC into an uncompressed WAV with no loss of quality, in your browser.
Key takeaways
- FLAC to WAV decompresses lossless audio into uncompressed PCM with no quality change at all.
- The WAV is larger but sounds identical to the FLAC, sample for sample.
- Use WAV for editors, samplers, and hardware that need decode-free uncompressed input.
- For storage or playback keep the smaller FLAC; for a small file use a lossy format instead.