Audio compression make the file bigger

As title says. I am exporting some mp3 files (tried ogg and wav also, still same problem) and imported size is bigger than original size when i check in inspector. My project is for WebGL.

Couldnt fix and finally i tried all setting combinations. Still same. If original files has a problem like as sample rate, bit rate and whatever they called, i would like to hear how can i optimize my files before import.

Now my 90% of my project size is occupied by sounds files.