Quick answer
Official and administrative websites are famous for strict file rules and weak error messages. They often ask for a photo under 100KB or 200KB and then reject anything that does not fit those limits exactly enough.
That is why image compression for public-sector and education portals is not just about optimization. It is about compliance. You need the file to meet the requirement, not simply to be smaller than before.
What usually works best
The most common use cases include scholarship applications, public administration forms, school registrations, and identity-related services. In all of those cases, the user usually wants one thing: a quick way to make the upload work without sacrificing image readability more than necessary.
ExactSizer is useful because it starts from the target the website gives you. If the form says 100KB, you can work toward 100KB directly. If the site is still strict, you can reduce dimensions or switch formats in the same place.
If it still fails
This matters even more when deadlines are involved. Scholarship and administration systems often close at fixed times, so people do not want to test five different tools before one file finally works.
It also helps teams, consultants, and support staff who prepare files for other people. When the same type of website keeps rejecting uploads, having one reliable process saves time on every submission.