PDF Tools
Protect PDF with Password
Add a password to a PDF.
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What is Protect PDF?
Add password protection to a PDF using pdf-lib's encryption API.
How it works
pdf-lib encrypts the document and emits a new PDF that requires the password to open.
- Upload a PDF. Set a user password and an owner password.
- Download. We produce an encrypted PDF for you to download.
Common mistakes
Forgetting the password
There is no recovery — store it safely.
Alternatives
Use a desktop reader
Adobe Acrobat and macOS Preview can also password-protect PDFs.
Frequently asked questions
Are passwords stored anywhere?
No. We never see your password — encryption happens in your browser.