Visit: pixelresize.com-> Upload your image-> Select Height and Width-> Select Quality-> See the live changes-> After you satisfy Click on Download.
To compress the Image without losing its quality, you can visit: pixelresize.com-> Upload your image-> Click on Quality-> Select quality 0.5-> And download.
As per the suggestions and users feedback, The best website which offers real time image compress functionality for free is pixelresize.com - Hope you liked it as well! :)