I have this small pixel art as example. Is there a way to make it bigger without it getting blurry or fuzzy in Photoshop?
It depends on what results you want.
If you want it to look "blocky" (i.e. each pixel in the original becomes a square in the result) then MrMerrick's answer is correct.
If you don't want it to look either blurry or blocky then you need a dedicated pixel art scaling algorithm. I'm not sure if such algorithsm are available for photoshop, I did find a plugin for paint.net if you are prepared to use that. http://forums.getpaint.net/index.php?/topic/23601-2d-image-scaling-algorithms/
Another possibility, here; try drawing your images using vector shapes. There is a little time investment, but the potential afterwards could pay dividends.
- Start by setting your grid size (say grid line every 10 pixels, with only 1 subdivision).
- Turn on grid snap.
- Using the pen tool draw your shape.
- For any parts of the shape that are separated (i.e. on a separate layer), select the multiple layers and use Layer > Merge Shapes.
It's pretty straightforward, and afterwards you can then scale and distort the shapes while retaining a crisp (or even anti-aliased) edge.
If you are looking to simply increase the size relative to other elements and wish to maintain the "pixel art look" then the nearest neighbour method already suggested is the way to achieve that.
If that isn't what you are looking for, there are some advanced scaling algorithms specifically designed for pixel art when you don't want to try maintian sharpness, see https://en.wikipedia.org/wiki/Image_scaling#Algorithms for a list and some examples. The xbr family and Kopf-Lischinski method (paper here, using a way-back-machine link as the main site (which should be here) appears blank at the moment) produce impressive results. ImageMagick supports a number of these so if Photoshop doesn't out-of-the-box you can no doubt find plugins that implement the one(s) you want to try.
Hum, yes you can use the option MrMerrick gave you, but you don't really need it... The idea of a pixel art is that you want to see the pixels.
So simply print it on the size you want at a ridiculously low ppi.
Take the program you use for print, Indesign, Ilustrator or Corel, paste the image there and stretch it to the desired size. No resampling needed.
If you want to increase the size significantly I suggest converting it to vector shapes first.
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It's crude, but if you open the image in Microsoft paint and zoom in, the pixels don't "smooth" out, you can then take a screen shot of this zoomed in view and move it back into photoshop.
There are other ways to do it of course but for something quick and simple it's what I tend to do.