ALL AUDIO TOOLS18
WAV to FLAC
Convert WAV to FLAC Online — Free & Lossless
Compress WAV files to FLAC without discarding a single sample.
Nothing is enforced, but the WAV is decoded to 32-bit float in this tab to draw the waveform — twice what 16-bit samples take on disk — and the FLAC is built in the engine's own memory before it reaches you, so a multi-hour master can exhaust the tab.
About WAV to FLAC
This is the one conversion on this page that costs nothing at all. FLAC is lossless compression: it models the waveform, stores the difference, and reproduces the original samples exactly when decoded. Run a WAV through FLAC and back and the result is bit-for-bit identical to what you started with — the same thing zipping a file does, but designed for audio and understood by audio software. The saving is real. Typical music compresses to 40 to 60 percent of its WAV size, which is why FLAC is the format of choice for archiving a CD collection, storing session masters, distributing live recordings and moving audio between studios without shipping gigabytes. Speech and quiet material often compress further; dense, loud, heavily limited material compresses less. Nothing about the conversion changes the sample rate, the bit depth or the channel layout, so a 96 kHz 24-bit master stays a 96 kHz 24-bit master. The trade-off is compatibility rather than quality: FLAC is well supported on desktop software, media servers and Android, and poorly supported in older car stereos and some Apple software, so it is an archive format rather than a delivery one. Encoding runs through FFmpeg compiled to WebAssembly inside this tab — a one-time engine download served from this site, never from a CDN — and the audio itself is never uploaded anywhere.
Questions
Is FLAC really lossless?
Yes, in the strict sense: FLAC models the waveform and stores the difference, so decoding a FLAC returns the same samples that were encoded. It is the audio equivalent of zipping a file rather than the audio equivalent of shrinking a JPEG. Nothing about the sound is approximated or thrown away.
How much smaller is FLAC than WAV?
Typically 40 to 60 percent of the original size for music. Quiet or sparse material compresses further; dense, loud, heavily limited masters compress less. The exact figure depends entirely on the audio, because the encoder is finding real redundancy rather than applying a fixed ratio.
What software plays FLAC files?
VLC, foobar2000, Audacity, Android, most media servers and network players, and current desktop browsers. Support is patchier in older Apple software and in car head units, which is why FLAC is best treated as an archive format — keep the FLAC, and make MP3s from it for the devices that need them.
Should I use FLAC or MP3?
Both, for different jobs. FLAC is what you store: it is lossless, so you can re-encode from it forever without stacking generations of damage. MP3 is what you send and what you put on a device with limited space. Converting FLAC to MP3 is a one-way step, so the FLAC is the one worth keeping.
Why does this page fetch an engine when the MP3 tools do not?
Because the encoders differ. MP3 is written by the lamejs library — about 254 KB, loaded from this site — and WAV by a small hand-rolled writer that is part of the page already. There is no FLAC encoder in JavaScript here, so FLAC output goes through an FFmpeg build compiled to WebAssembly: a one-time download of roughly 31 MB, served from this site rather than a CDN, and cached afterwards.
Is my file uploaded to a server?
No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.