Lock PDF

Add a password to a PDF and define the core permissions for that document.

PDF100 MB / file

Safe and free to use

Core use is freeNo account requiredFiles are processed temporarily

Tool area

Lock PDF

Protect a PDF with a password and control whether printing, copying, or editing remain allowed.

This tool adds a new password. It is not intended for editing or unlocking PDFs that are already encrypted.

Select one PDF file.

Short description

A practical document protection tool for teams that want to password-protect files before sharing them.

Quick note

This tool adds a new password to unencrypted PDFs. It is not an unlocker for files that are already protected.

Internal links

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Usage, quality and trust notes

When to use it

  • Useful for preparing application files, email attachments, official documents and school PDFs quickly.
  • Helps check file size, page order, readability and format compatibility before sharing a PDF.
  • Connects common document steps such as merging, compressing and converting in the same workflow.

Limits and better-output tips

PDF tools work best with clean, unlocked files. Scanned documents may need OCR, and very large files can take longer to process.

PDF · 100 MB / file

File and privacy approach

Files are used in a temporary workspace to complete the selected action. For sensitive documents, review the downloaded output before sharing it.

Review the downloaded output before publishing or sharing it.

How to use

  1. 1Upload the PDF file.
  2. 2Set the password and permission options.
  3. 3Download the protected PDF.

Core settings

Open password

Define the password required to open the document.

Permissions

Choose whether printing, copying, and editing should stay available.

Why this tool helps

Makes document sharing more secure.

Adds a security-focused flow to the PDF toolkit.

Related tools

Privacy preferences

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