Encrypt PDF from Google Docs Using Free Tools
Encrypting a PDF from Google Docs does not require a paid tool. Several free options exist depending on your platform and whether you are comfortable using a web-based service.
Mac Preview
On Mac, open the exported PDF in Preview. Go to File > Export as PDF and click the Permissions button. Check 'Require password to open document,' enter your password, and save. Preview applies AES-128 encryption at no cost.
PDF24 Desktop (Windows)
Download PDF24 Desktop from pdf24.org. It is free and processes files locally. Open the app, go to Protect PDF, drag in your file, set a password, and enable AES-256 in the advanced settings. Save the protected file.
PDF24 in the browser
Go to pdf24.org, select Protect PDF, upload the file, set the password, and enable AES-256 in the options. Download the result. This is a web-based tool, so the file is sent to PDF24's servers. Use the desktop version for sensitive documents.
Frequently Asked Questions
Are free encryption tools trustworthy?
PDF24 is a well-established tool with a good reputation. For public-facing or internal business documents, it is fine. For highly confidential documents, the desktop version (which processes files locally) is preferable to any web tool.
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