Audio is processed on your device. Nothing is uploaded.
How to compress a WAV file
Drop your WAV files into the tool and choose whether to keep them as WAV or convert them to MP3. The new size shows up the moment you change a setting, and the file is processed a moment later. Play the original and compressed versions, and use the switch button to flip between them at the same spot so you can hear any difference before you download.
Smaller WAV or MP3?
Keep the WAV format when the file is going into software that expects WAV, like a video editor, a phone system, a game engine or a sampler. The tool shrinks it by lowering the sample rate, bit depth or number of channels, and the result is still a standard uncompressed WAV that opens anywhere.
Convert to MP3 when you just need a smaller file to share, store or listen to. An MP3 is usually around a tenth the size of a CD-quality WAV, and at 192 kbps or higher most people can't hear a difference.
How each setting affects size
| Setting | Size change | When to use it |
|---|---|---|
| Stereo to mono | Half the size | Voice, interviews, voicemail and anything recorded with one microphone |
| 24-bit to 16-bit | A third smaller | Almost always. 16-bit is CD quality and plenty for finished audio |
| 16-bit to 8-bit μ-law | Half the size | Phone systems, IVR prompts and intercoms. Sounds much better than plain 8-bit |
| 48 kHz to 44.1 kHz | About 8% smaller | Music and general audio |
| 44.1 kHz to 16 kHz | About 64% smaller | Speech, dictation and transcription |
| 44.1 kHz to 8 kHz | About 82% smaller | Telephone audio only |
When the bit depth goes down, the tool adds a tiny amount of dither noise. That's standard practice in audio mastering and it prevents the harsh distortion you'd otherwise hear on quiet passages and fade-outs.
Phone system and IVR audio
Many phone systems and voicemail platforms require 8 kHz, mono, 8-bit μ-law WAV files. Choose the Phone preset to get exactly that format. If your system asks for 16-bit PCM at 8 kHz instead, switch the bit depth to 16-bit and keep the rest.
Frequently asked questions
Can I compress a WAV without losing quality?
Partly. Going from 24-bit to 16-bit, or from a stereo file whose channels are identical to mono, makes no audible difference. Lowering the sample rate removes high frequencies, so save that for speech. For truly lossless compression of music, FLAC is the format to use.
Why can't my browser play the μ-law preview?
Some browsers can't play μ-law WAV files, even though phone systems, Windows, VLC and audio editors open them fine. If the preview is unavailable, the downloaded file is still valid.
Will the title and artist info be kept?
Yes, for WAV output with Keep title and artist info turned on. The tool copies the file's INFO metadata into the new WAV.
Can I process several WAV files at once?
Yes. Add as many as you like. Every file uses the same settings, and Download all saves them as one ZIP.
Are my files uploaded?
No. Everything happens in your browser and your audio never leaves your device.