50 KB is the usual upper limit for passport-size photos on exam and recruitment forms, and for photos on many scholarship and government portals.
Add your image, check that the maximum is 50 KB, and download. The tool lowers the quality step by step until the JPG is under 50 KB, and keeps it above the minimum if your form has one.
Yes. Type the width and height your form asks for, for example 200 × 230 pixels, and the photo is cropped to fill that size. For exam forms, the Exam photo kit already knows each exam's sizes.
No. It is resized inside your browser, so it never leaves your phone or computer.