Why upload forms are so strict
Application forms, exam portals and ID uploads often cap photos at something like 100 KB, 200 KB or 1 MB. A modern phone photo can be 3–8 MB, so you have to shrink it before uploading.
Quality versus dimensions
Two things control file size: JPEG quality (how much detail is discarded) and pixel dimensions (how big the picture is). Lowering quality a little saves a lot at first; beyond that, reducing the dimensions is what gets you under a strict limit.
Hitting an exact target
Rather than guessing, pick a target size. The tool lowers quality, then dimensions, step by step until the image fits, and tells you honestly if it couldn't reach the limit.
- Open the Compress image tool and add your JPG or PNG.
- Choose “Target a file size” and pick a limit or enter your own.
- Compress, compare the sizes, and download.
Good to know
The result is always a JPG. If your PNG has transparent areas they become white. Keep the original, and check the compressed picture still looks right at the size it will be used.