I'm guessing some "graphic designers" here are so blinded by the trivial nature of OP's question and thinks he's just dumb.
Problem: cropping usually means open up the image, crop it, then re-save it back to a lossy format (ex jpg) which means you are compressing again.
Solution: some image viewers has a lossless crop function, where you designate the area you want and the program omits the actual data that you didn't specify, opposed to traditionally performing an image edit and saving it as a new lossy image.
This is comparable to opening a mp3, performing a trim or volume change, and then resaving to mp3 again resulting in a lossy transcode. The proper way to do this is use mp3directcut or similar, designate your beginning and end points, and the program will leave throw out the data of the sections you don't want. You can do this with volume too I believe.
>>250998 I forgot to mention this applies to image rotation as well, which is a very common thing with smartphones not fixing your photo orientations. I have no idea if Android or Apple engineers are smart enough to be conscious about this, but I assume everytime you tap those rotation arrows, you are adding permanent jpg artifacts to those photos and you have no backup. If anyone really cares, you can probably do a few tests and compare the image hashes.
I know this all sounds slightly autistic, but I've run into some situations where I lost my original source files. I had to repurpose some website jpgs and lossless cropping can save your life.
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