PDF Protect
Add a password to any PDF. Real 128-bit RC4 encryption — enforced by every major PDF reader. Runs 100% in your browser.
How PDF Protect works
Choose any .pdf file. Nothing is uploaded — encryption runs locally.
Pick a strong password (4+ chars). Confirm it. Anyone opening the PDF will be prompted for this password.
Real 128-bit RC4 encryption — enforced by Adobe Acrobat, Preview, Chrome, Firefox and every other PDF reader.
Frequently asked
How strong is the encryption?+
128-bit RC4, the PDF 1.4 standard. It's the same encryption used by Acrobat's default "Password Security" preset for compatibility with all readers.
Can you recover a lost password?+
No — there's no back-door. Store your password in a password manager.
Does it work on my phone's PDF reader?+
Yes. Every major PDF reader on desktop, iOS and Android supports 128-bit RC4 encryption.
Is the PDF uploaded?+
Never. Encryption runs entirely in your browser using the pdf-encrypt-lite library (~9 KB gzipped).