Image compression tool compress size of image from some 100kb to 20kb around,it is estimate reduction of 300%.So as due to small sizes the website loading images take less time.But sometime it also poorer the quality of image.So i have one more suggestion,use adobe photoshop to reduce size of image & always save image in adobe photoshop as 'save image for web devices' this is really a cool trick & it does not decrease quality of image.
if you don't have adobe photoshop than you can use some only tool of image compression.
these are : Image Optimizer , Image compression , Jpeg-Optimizer*
let's have step-by-step process of js compression.
Open 'jscompress.com' .
See image below
Both these code must be remove before inserting your js code. Otherwise it will give error ' Unexpected token: operator (<) '.So be careful.
The compression above taken under are recommended steps for every blogger and programmer.who is designing their content & must be knowledge for future use.