ILovePDF provides a wide range of PDF tools that run entirely in the browser. You can merge, split, compress, convert, rotate, unlock, protect, watermark, and OCR PDFs, among other tasks. Each tool has a simple upload-process-download workflow, and the interface is available in dozens of languages. The site also integrates with Google Drive and Dropbox, so you can pull in files from cloud storage without downloading them first.

The free tier allows a reasonable number of tasks per day with file size limits, and the premium plan removes those restrictions. Files are deleted from the servers after a couple of hours. It's a practical choice for everyday PDF work and one of the most widely used tools in its category. The mobile app works well too if you need to handle documents on the go.