imgproxy: fast and secure on-the-fly image processing
Image resizer
Easy Resize
Now, it's really easy to resize pictures online.
Ze Robot
ImageOptim
Online Image Resizer
Online Image Resizer lets you to easily resize your images, photos, pictures and scanned documents without losing quality online.
ResizeImage.net
Crop, resize images in JPEG|PNG|GIF format to the exact pixels or proportion you specified, compress them to reduce the file sizes, making it easy to use them as your desktop wallpaper, Facebook cover photo, Twitter profile photo, avatar icons, etc.