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PDF Security

Protect PDF

Configure a PDF password and permissions in a private browser workflow.

Important: pdf-lib can read and rewrite many PDFs, but it does not export standard password-encrypted PDFs. This screen is the production UI shell; the final encryption engine must be supplied by a WASM or SDK backend running in the browser.
Passwords and files stay in this browser

User guide

How to use PDF Protection Settings

Validate password strength and permission choices before handing data to a standards-compliant encryption engine.

  1. 1

    Choose an unencrypted PDF.

  2. 2

    Enter and confirm a strong opening password.

  3. 3

    Select printing, copying, and editing restrictions.

  4. 4

    Review validation; use the standard-encryption adapter when a compatible engine is configured.

Best for

  • Preparing encryption settings
  • Checking password quality before protecting a file

Important limitation

pdf-lib does not implement standard PDF password encryption. This page must not be treated as proof that a downloaded PDF is encrypted.

Frequently asked questions

Does pdf-lib set an opening password?

No. A separate standards-compliant encryption engine is required.

Are PDF permissions absolute security?

No. Viewer applications may handle owner permissions differently.

PDFPerch processes files locally unless this guide explicitly identifies a cloud-dependent feature. Always keep an original copy and verify critical output before submission, printing, signing, or accounting use.