Lock PDF
Set a standard password on any PDF file. The locked PDF works with Adobe Reader, Chrome, and all PDF viewers — 128-bit RC4 encryption.
Lock PDF — Free Online Tool
Set a standard password on any PDF file. The locked PDF works with Adobe Reader, Chrome, and all PDF viewers — 128-bit RC4 encryption.
Frequently Asked Questions
What is Lock PDF?
Lock PDF is a free, browser-based tool on TitanFile that lets you set a standard password on any PDF file. The locked PDF works with Adobe Reader, Chrome, and all PDF viewers — 128-bit RC4 encryption. Everything runs locally on your device — no files are uploaded to any server.
How do I use Lock PDF?
Open the Lock PDF page, upload your file or enter your data, adjust any settings, and click the action button. Your result is ready to download instantly. No sign-up or installation required.
Is Lock PDF free to use?
Yes — Lock PDF is 100% free with no limits, no watermarks, and no hidden fees. You can use it as many times as you need.
Is my data safe with Lock PDF?
Absolutely. Lock PDF processes everything directly in your browser using JavaScript. Your files and data never leave your device — nothing is uploaded to any server. This makes it one of the most private pdf tools available online.
What are the advantages of using Lock PDF on TitanFile?
TitanFile runs entirely in your browser, so your files stay private. There are no server uploads, no server-side processing, and no account required. Lock PDF works offline once loaded, is mobile-friendly, and produces results in seconds — all for free.