Before I found this site, when I needed a larger resolution photo to meet a width and height, I’d simply stretch the photo in MS Paint or PicPick. Since my Samsung Galaxy S4 Zoom takes large resolution photos, I only have to do this with pictures I collect from other sources.
Now, all I have to do is visit Waifu2x at http://waifu2x.udp.jp/Waifu2x, upload the picture from a file or an URL, and decide to upscale it x1.6 or x2. Seconds after selecting “Submit Query” I have a finished product I can readily save as *.png or *.bmp. The entire process takes seconds.
if you’d prefer to download it, you can do so via GitHub.