I have a lot of images that are too small but every time I increase their size, they get blurred or pixelated. I've seen a lot of images on this size that look like they have been enlarged, so can anyone please tell me how I can enlarge a picture WITHOUT damaging it?

What you are referring to is distortion. You're stretching the image like a piece of gum. I never go from a small image to large, but only vice versa so I never stretch an image.

If you have Photoshop you can open up the image, Ctrl + T it and then hold Shift and drag it to whatever size you want. It will still look good.

If not, I believe you can resize images online.

http://lmgtfy.com/?q=image+resize

Thanks, I can do it now