How to Password Protect a PDF
This online PDF password protect tool adds an open password to PDF files. Upload one or more PDFs, enter a password, and export new protected PDF files directly in your browser. It is useful for contracts, quotes, invoices, client files, internal documents, training materials, resumes, and private PDF documents.
How to use the tool
- Upload one or more PDF files.
- Enter a user password. This is the password required to open the PDF.
- Optionally enable a separate owner password for permission-related PDF metadata.
- Click the protect button and wait for the encrypted PDFs to be generated.
- Download individual PDF files or export all protected PDFs as a ZIP.
User password vs owner password
The user password is the open password. Anyone opening the protected PDF needs this password.
The owner password is related to PDF permission settings. PDF reader support for permissions can vary, so this should not be treated as strict DRM. In practical terms, this tool is best used to add an open password to a PDF, not to guarantee copy, print, or edit restrictions across every PDF app.
Batch PDF encryption
You can upload multiple PDF files and protect them in one workflow. This is helpful when processing contracts, invoices, quote documents, reports, client packages, or internal PDFs. After processing, download files one by one or package all protected PDFs into a ZIP archive.
Local browser processing
PDF reading, encryption, and export happen locally in your browser. Your files are not uploaded to a server. This makes the tool suitable for PDFs containing names, addresses, pricing, contract terms, internal notes, and other sensitive information. For highly confidential files, still use a trusted device and browser environment.
Why already encrypted PDFs need to be unlocked first
If a PDF already has an open password, unlock it first or export an unencrypted copy before using this tool. Browser-side PDF libraries cannot safely modify the original structure when the document is already encrypted and locked.
Password tips
Use a password with at least 8 characters and mix letters, numbers, and symbols. Avoid putting the password in the file name. When sending a protected PDF, send the PDF and the password through separate channels when possible.
Common use cases
- Add a password to contract PDFs.
- Protect quotes, invoices, and billing PDFs.
- Batch encrypt internal documents.
- Add basic access protection before sharing client files.
- Protect PDFs before uploading or forwarding them.