Most "free online PDF" tools quietly upload your document to a server. For a signed contract or a scanned ID, that's the whole problem. So I built two tools that don't: an OCR PDF that turns a scanned PDF into a searchable one, and a Sign PDF that adds your signature — both running 100% in the browser. Nothing is uploaded; close the tab and it's gone.
Here's how each one works, plus the part that actually took the effort: getting WebAssembly OCR to run under a strict Content-Security-Policy with no CDN.
OCR: scanned PDF → searchable PDF, client-side
A scanned PDF is just images. You can't select or search the text. "OCR" means recognizing the characters and — for a searchable PDF — laying an invisible text layer over the page image so the document looks identical but the words are now selectable.
The pipeline, entirely in the tab:
