Plain explanations of the things that actually cause trouble: hitting an exact file size, choosing a format a government portal will accept, and what document encryption really protects.
Why the quality slider never lands on the file size you need, how an exact-KB compressor actually finds the answer, and when you have to cut resolution instead of quality.
Read the guide →A PDF has two different passwords and only one of them is real security. What AES-256 encryption actually does, why permission flags can be stripped in seconds, and which one you need.
Read the guide →Upload errors on government and exam portals usually come from a handful of causes. How to read the requirement properly and fix each one, including the minimum size nobody mentions.
Read the guide →Key derivation, why the iteration count matters, what authenticated encryption detects, and why an encrypted photo is deliberately not an image any more.
Read the guide →Why PNG makes photographs enormous, why JPEG ruins signatures and text, why WebP gets rejected by government portals, and how to choose correctly the first time.
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