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  1. Products
  2. PDF apps
  3. Lock

Password protect PDF

Protect your PDF files by adding a password to those documents with our safe and easy-to-use online tool.

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Aspose.PDF Download Developer API

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API Documentation
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Desktop app
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Protect PDF document online is a utility that allows you to protect your PDF document with a password. Protection is performed using a strong encryption algorithm AESx128 and a password that you specify in the password field. The AES algorithm has been approved by the US National Security Agency as suitable for encrypting highly sensitive information. We do not store your passwords and documents. The encrypted document can be transmitted securely to your colleagues via email or other cloud services. We do not recommend sending your PDF protected documents via email along with a decryption password. This increases the risks that your letter can be intercepted by someone and the attached document, along with the password, will fall into the hands of cybercriminals.
This password protection tool works with all popular formats such as PDF, Word, Excel, PowerPoint and works on any Windows, MacOs, Linux or Android operating system. Your protected files are stored on our servers for a limited time and no one has access to them without a special encrypted link. You can also use the "Delete immediately" function and your files will be deleted instantly.
You can also, using our service, send a link to download your protected document to yourself or your partners by email. But keep in mind that only a link to download the document will be sent to the email without specifying the password that you specified for protection.
How to

How to protect PDF file

HowTo

FAQ

  • ❓ How can I add password protection to PDF document?

    First, you need to add a file for lock: drag & drop your PDF file or click inside the white area for choose a file. Then click the 'PROTECT' button. When PDF document password protection is completed, you can download your result files.

  • ⏱️ How long does it take to PDF password protection?

    This Lock app works fast. You can add password protection to PDF in a few seconds.

  • 🛡️ Is it safe to add password protection to PDF using free Lock app?

    Of course! The download link of result files will be available instantly after lock. We delete uploaded files after 24 hours and the download links will stop working after this time period. No one has access to your files. File Lock is absolutely safe.

  • 💻 Can I add password protection to PDF on Mac OS, Android or Linux?

    Our PDF Locker works online and does not require any software installation.

  • 🌐 What browser should I use to protect PDF?

    You can use any modern browser to add password protection to PDF, for example, Google Chrome, Firefox, Opera, Safari.

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