How to use it
- Add your file. Drop it on the box or choose it from your device.
- Set it up. FLAC keeps every bit of the sound at about half the size. MP3 or M4A make it far smaller.
- Compress WAV. Press Compress WAV. Long or large files take a while on phones.
- Download. Save the result.
What happens to your file
WAV stores sound uncompressed. FLAC packs exactly the same sound into roughly half the space; MP3 and M4A remove sounds you are unlikely to hear and are 5–15 times smaller.
Smaller WAV files without surprises
- WAV is uncompressed: one minute of CD-quality stereo is about 10 MB. Converting to FLAC halves that with no quality loss.
- If the file must stay a WAV (some phone systems and samplers require it), lower the sample rate or switch to mono instead.
- Telephone and IVR systems often want 8 kHz, 16-bit mono WAV; voice assistants and transcription tools usually prefer 16 kHz mono.
- For sharing music, an MP3 at 192 kbps or M4A at 160 kbps is about 85% smaller than WAV and sounds the same to most people.
- Keep the original WAV if you will edit the audio again; compressed copies are for delivery.
Questions
Is my file uploaded?
No. Everything happens inside your browser with FFmpeg compiled to WebAssembly. Your file never leaves your device.
Is there a size limit?
Only your device’s memory. Files up to a few hundred MB work on most computers; phones manage smaller files.