How much smaller will my WAV file be after conversion?

Typically 80-90% smaller depending on the bitrate. A 30MB WAV file becomes about 3-6MB as MP3 depending on whether you choose 128 or 320 kbps.

Does converting WAV to MP3 reduce audio quality?

Yes. MP3 is a lossy format. At 192 kbps or higher, most people can't hear the difference on typical speakers. At 128 kbps, quality loss may be noticeable on high-quality headphones for music with complex instruments.

Are my files uploaded to a server?

No. All conversion runs in your browser using WebAssembly. Your WAV files never leave your device.

Yes, completely free with no account needed.

Images Tool Box

Conversion

WAV to MP3 Converter Online Free

Convert large uncompressed WAV audio files to MP3 to reduce size by 80-90%. WAV files are huge and difficult to share or upload. A 3-minute stereo WAV is about 30MB. At 192 kbps MP3, that drops to around 4MB with audio quality that most people can't distinguish from the original.