Compressnow is a web tool that can compress images easily.
It could be helpful to reduce the weight of images, in order to use it on a website. The webpage will load faster, and it saves bandwidth.
Just choose your % of compression to get a result. You can upload image up to 9 MB = 9000 KB.
Width and Height of image will not change. Supported file types are : gif, jpg, jpeg, png.
Alternative solutions which support multi image upload;
If you are using WordPress, you can search for a plugin to compress your images easily;