Isteg is a portable tool so no installation required. Just run it, select an image, then a zip file (Win zip / 7zip) and click ‘Hide it’ button. It will create a new image on the same directory of your original image file.
The program has no option to recover the embedded zip file. To recover your file, simply change the extension of your image file just created. That is, if your image is wallpaper.jpeg, just change the extension to wallpaper.zip. That’s all.
Even though the tool lets you hide any file into an image, you can only recover zip files properly. Download Isteg.