Security and privacy
Protect PDFs with a password or unlock them, redact content verifiably and remove hidden content.
7 tools, free and no sign-up needed
Protect PDF with a password Encrypt your PDF with AES-256 and decide whether printing or copying is allowed. Open 
Remove PDF password Remove the password from a PDF whose password you know. Open 
Redact PDF, text is removed Redact names, numbers and other terms. Every match is removed from the file, not just covered up. Still, check the result yourself: anything the search doesn't find, like a different spelling or text inside an image, stays visible. Open 
Redact patient data without uploading Redact or pseudonymize sensitive data right on your device. Your documents never leave it, ideal for medical practices, law firms and expert witnesses. Open 
Remove hidden content from PDF Remove JavaScript, automatic actions, form fields and embedded files before you pass a PDF on. Open Also useful here
Verify PDF signature Check who signed a PDF, when, and whether it was changed afterwards. Whether the certificate can be trusted is not checked. Open 
Pixelate or blur parts of an image Hide faces, license plates, addresses or other sensitive spots in an image, pixelated or blurred. Open