Sejda is an online PDF editor that lets you do more than just merge and split. You can edit text directly in a PDF, add images, draw shapes, fill out forms, add signatures, and annotate documents. The editor is responsive and the interface is designed to be approachable for non-technical users. There's also a desktop version for Windows, Mac, and Linux if you prefer to work offline.

The free tier allows three tasks per day with a 50MB file limit, and the paid plan removes those restrictions and adds more advanced features. Sejda is particularly useful when you need to make small edits to a PDF without converting it to Word and back. For anyone who occasionally needs to modify a document, it fills a gap that basic PDF tools leave open.