Turn your WAV files into MP3 so they're much smaller and easy to send or publish. Everything happens in your browser.
No sign-up and nothing uploaded to a server: everything happens in your browser. See for yourself.
Usually between 7 and 10 times, depending on the quality you choose.
At 192 kbps or higher, most people can't tell the difference in normal use.
Yes. Select as many as you like and download them together in a ZIP.
WAV stores sound uncompressed, which is why one minute of CD-quality stereo audio weighs about 10 MB. The same minute as an MP3 at 192 kbps weighs about 1.4 MB.
If you're going to keep editing the audio, keep the original WAV and use the MP3 only for sharing or publishing, because MP3 discards some of the information when it compresses.