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Encrypt PDF

Password protect PDF files. Add encryption and set permissions.

Upload PDF File

Drag and drop a PDF file here, or click to browse.

About This Tool

Encrypt PDF adds password protection and encryption to your PDF documents. Set user passwords to prevent opening, and owner passwords to control permissions like printing and copying.

Choose from different encryption levels (128-bit or 256-bit AES) for varying security needs.

All encryption happens in your browser, ensuring your passwords and documents remain private.

How to Use

  1. Upload Your PDF

    Drag and drop your PDF file or click to select.

  2. Set Passwords

    Enter user password and/or owner password. Configure permissions.

  3. Encrypt and Download

    Click Encrypt to secure your PDF and download.

Use Cases

Confidential Documents

Protect sensitive business documents.

Personal Files

Secure personal documents like tax returns.

Controlled Distribution

Limit what recipients can do with documents.

Practical guide

Why choose local processing?

  • Sensitive PDFs can contain contracts, invoices, identity details, or internal business information, so keeping processing in the browser reduces exposure.
  • The website tool is free to use with no usage limits and does not require sign-in.
  • Local processing also keeps iteration fast: adjust options, preview the result, and export an encrypted PDF without waiting for an upload queue.

Best files for this tool

  • Best for PDF files that open correctly in a modern browser and are not intentionally damaged or restricted.
  • Works well for everyday business, school, legal, finance, and personal documents where you need an encrypted PDF.
  • For very large files, close unused tabs and process one batch at a time so the browser has enough memory.

Common limitations

  • Encrypted or permission-restricted PDFs may need to be unlocked before processing.
  • Scanned pages, unusual fonts, complex layers, and damaged files can reduce accuracy or processing speed.
  • Browser memory and device performance matter more for local tools than for upload-based services.

Local processing vs upload-based tools

  • Local tools keep routine website processing on your device, while upload-based tools send files to a remote server.
  • Upload-based services can move heavy work off your computer, but they add transfer time and require trusting a server with your files.
  • Use the API when you intentionally need server-side automation; use the website when you want private manual processing.

What to do if processing fails

  • Try a smaller file, a shorter page range, or one file at a time if the browser runs out of memory.
  • If a PDF is encrypted, damaged, or restricted, unlock or repair it first and then retry the workflow.
  • If the output looks wrong, check whether the source file uses scans, complex transparency, form fields, or unsupported embedded objects.

API automation

Use API docs to plan automated PDF workflows. If this exact website workflow is not exposed as an endpoint yet, you can still use available PDF API tools and Credits for supported operations.

View API automation docsCreate API Key

Frequently Asked Questions

What's the difference between user and owner passwords?

User password prevents opening; owner password controls permissions.

What encryption is used?

128-bit or 256-bit AES encryption options are available.

Can I set permissions without a user password?

Yes, you can set an owner password only to control permissions.

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