Simple Image Compressor is online application which reduces image size. You can compress image:

Using default options - just select the image and click "compress image" button. Default option finds sweet spot between image file size and image quality.
Or defining options like image width and/or height. If you define only one value (width or height) the second one will be calculated based on image aspect ratio.

Simple Image Compressor helps you:

Reduce your photos/pictures/images file size,
Reduce your assets size,
Save disk space on the computer or the phone (Android, iPhone),
Make your documents smaller (eg. word documents, pdf documents, scanned documents, etc.),
Make your webpage or blog smaller and you pay less for your hosting server,
Reduce your bandwidth consumption,
Share faster your images.