Here are 5 Free Websites to Increase the Size of Image Online. 1. Waifu2x.udp.jp is a free website which lets you increase the size of the image by changing its resolution. 2. Fixpicture.org is another website which lets you upscale or resize the image up to 1000px. First you have to select your input image by clicking the BROWSE button. 3. Resizepiconline.com is an easy to use website which lets you increase the size of images by changing their resolution in a user friendly way. 4. Resizeyourim