Free program that allows you to check the quality (compression) of the file in JPEG format (.jpg) - e.g. a photo from a digital camera. Since the JPEG format is not lossless (every time a file is compressed at the expense of quality), the program is particularly useful for people who want to edit JPEG files.

Thanks to them you can check what (quality) compression should be used in order to keep the quality of the file not lower than the original one. This will avoid a situation where the original photo from the digital camera will look better than the one processed in a graphics program but stored with too little quality.