Convert WAV to FLAC
Lossless in, lossless out — the archival format that halves the shelf space, made on your own device.
Drop your video or audio here
or
MP4, MOV, WebM, MKV, AVI, MP3, WAV and more — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
FLAC is what WAV wants to be when it grows up: the identical audio samples, mathematically lossless, at roughly half the file size — plus proper tagging and built-in integrity checks. For archiving recordings, masters, and rips, it is the format the audio world settled on.
The conversion compresses the WAV's samples losslessly on the site's built-in engine — it loads once on first use, then works entirely in your browser. Decode a FLAC and you get the WAV's samples back bit-for-bit; nothing is approximated and nothing uploads.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Convert
Compatible files are repackaged instantly with zero quality loss; others are hardware-transcoded at high quality.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
Is WAV to FLAC really lossless?
Mathematically — FLAC compresses like ZIP does, storing the exact samples in less space. Decoding reproduces the WAV bit-for-bit; nothing about the sound changes, ever.
How much smaller does the FLAC come out?
Typically 40–60% smaller than the WAV, depending on the material — quiet and tonal recordings compress best, dense noisy material least. Either way the audio is untouched.
Why does the first conversion pause before starting?
FLAC encoding runs on the site's built-in engine, which downloads once on first use — a few seconds — and is cached after that. Everything still happens on your own device.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.