Put this thread up for one of the contests, because a lot of people seemed to need the info. Feel free to contribute more! Step 1: Click 'Image' on the top left bar. Step 2: On the drop-down list, click Resize. It's the second option. Step 3: On the window that pops up, select the drop-down list for Resampling, and select the 'Nearest Neighbor' option. Step 4: Choose your resizing method. If you want it five times larger, for example, choose 'By percentage:', and set the percentage to 500%. If you want it to be 300x550 pixels, choose 'By absolute size:', and set the pixel width and height. One thing to note: Keep 'Maintain aspect ratio' checked. Otherwise, you might set your new size to distort the original picture. Good luck! @Suika Ibuki contributed this! Thank @zooey for this tutorial! The quote broke, original post is here. 1. Click on the "image" pull down menu 2. Select 'scale image' 3. This window will come up. In the circle, you can pick the units you want to use; I like resizing by percent, but that's just personal preference. 4. Select 'none' in the 'interpolation' field. This way, GIMP won't do any guesswork on the resize, and you won't get any of those little pixely artifact marks. 5. Then click 'OK'. 6. Occasionally, if you resize by an odd number (like 133%) some of the rows and columns will get an extra pixel. Like say your sprite used to be 1 : 1, then you resized it so pixels were now 4 x 4, you might find that some rows and columns (in their entirety) are now 5 x 5. In this case, you can either use the rectangle select tool to delete the extras, then grab the pieces and put them back together, or undo the resize and pick a different value. *Note: if you want to resize just one layer, rather than the whole image, start with this: ...then follow steps 2 to 6. This tutorial was also contributed by @Suika Ibuki. Torrle posted another method, and as I have no idea how Photoshop works at all, the more guides in here the better! @blind sniper was the contributor of this tutorial! @Sgt. Sprocket contributed this guide for Microsoft Paint. And a bonus: Resizing gifs! Thank @Suika Ibuki for this guide!