ILoveMyTools is a collection of 54 free online tools in 8 categories: Text, Image, PDF, Calculators, Generators, Random and Games, Time, and Developer. It includes 20 PDF tools, and the Edit PDF tool can change existing text as well as add text, images, shapes and links. The site is available in 10 languages.
Everything is free and the site is funded by advertising. No account is needed, with no watermark and no daily limit. PDFs, images and text are processed in the browser and not uploaded, though a few tools, such as the Broken Link Checker, contact the server and say so on their pages.
Most free PDF editors either upload your file to their servers or only place new text over the old words. The builder wanted an editor that changes the text already in the PDF and runs in the browser.