Make audio files much smaller and still sound good.
Good for most recordings and podcasts.
Drop up to 10 MP3, WAV, M4A or OGG files, or a video to use only its sound.
Voice gives the smallest files for speech. Music keeps more detail.
See how much smaller each file got, then download them, or all as one ZIP.
No. It is compressed by your browser, so the file stays on your device.
A WAV file often shrinks by 80 to 90 percent when saved as MP3. An MP3 that is already small shrinks less, and the result can even be larger, which the tool tells you.
Voice. It makes the audio mono and lowers the sample rate, which suits speech and gives the smallest file.
Yes, a little. MP3, M4A and OGG are lossy formats that discard sound you are unlikely to hear. Keep the original if you may need the best quality later.
MP3 works almost everywhere. M4A (AAC) is usually a bit smaller at the same quality and works on Apple devices and most phones.