Smallpdf

Smallpdf brings together a clean set of PDF tools for compressing, converting to and from Office formats, merging, splitting, and electronically signing documents. Its polished, beginner-friendly design has made it one of the most widely used PDF services online.

A limited number of tasks are free each day, while a Pro subscription unlocks unlimited use, batch processing, and desktop and mobile apps. It also integrates with Google Drive and Dropbox for a smoother workflow.