How to choose the right PDF tool
Use Merge PDF when combining files, Split PDF when extracting pages, and Organize PDF when the page order itself needs editing.
Compress PDF is best when the goal is smaller sharing copies, while PDF to JPG/PNG makes more sense when you need page images for slides, messaging, or design review.
If a file is locked, start with Unlock PDF. If you only need a visible signature or annotation layer, Sign PDF is usually the faster option.