This repo has two versions of a PDF Redact Tool, an Angular 7 version and a JS version
Usage | Demo
You can simply redact your pdf file online. (Simply drag a square on the canvas) Check out the Demo page, and you can cover up whatever you want on your pdf file and download it as the modified version!
When you upload your file, you are not sending it anywhere. The browser is only using it as input to edit it. The files only stays in your computer.
Added Google tag to track the traffic of the public demo page. If you are forking the entire repo instead of the specific build (Angular7/JS) of the PDFRedactor, please REMOVE the tag from /docs/index.html