Encrypt any PDF file online without uploading to a server. AES-256 encryption runs entirely in your browser.
Part of our Password Protect PDF Free suite
Encrypt PDF files online without uploading them to any server. This browser-based tool applies AES-256 encryption and lets you set separate user and owner passwords with granular permission controls for printing, copying, modifying, annotating, and filling forms. Your documents stay completely private because the entire encryption process runs locally on your device. Unlike cloud-based encryption services that require uploading your sensitive files to their servers, this tool processes everything in your browser's memory. The encrypted PDF is generated on your machine and never transmitted over the internet. This approach eliminates the risk of data interception, server breaches, or unauthorized access by third parties. You get enterprise-grade security with zero privacy compromise.
Select or drag and drop the PDF file you want to protect with a password.
Choose a strong password and configure what actions are allowed — printing, copying, modifying, annotating, and filling forms.
Get your password-protected PDF instantly. Everything runs in your browser — no server uploads.
Password-protect PDFs before sending via email to ensure only intended recipients can open them, even if the email is intercepted or forwarded.
Protect drafts and final deliverables so only paying clients can access the content. Restrict copying to prevent unauthorized redistribution.
Encrypt shared documents before uploading to collaboration platforms, adding security beyond what the platform provides.
Our tool uses AES-256 by default — the strongest widely-used encryption standard available for PDF files. This is the same algorithm used by banks and government agencies.
We don't store your password anywhere. If you forget it, there's no recovery option. Write it down in a secure place or use a password manager.
Set a simple user password for recipients to open the file, and a complex owner password for yourself to retain full control over permissions and future changes.
All processing happens locally in your browser. Your files never leave your device.
No uploads, no waiting for servers. Instant processing powered by your device.
No limits, no watermarks, no registration required. Free forever.
Lock your PDF files with a password so only authorized people can open them. Free, private, and runs entirely in your browser.
Professional PDF encryption tool with AES-256 security. Set user and owner passwords, configure permissions. Browser-based and free.
Secure your PDF documents for free with AES-256 encryption. No signup, no limits, no watermarks. Everything runs in your browser.
Add a password to any PDF file in seconds. Free browser-based tool with AES-256 encryption. No server uploads.
Professional online PDF password protection with AES-256 encryption. Set user and owner passwords, configure permissions. 100% private.
Password-protect PDFs without Adobe Acrobat Pro. Same AES-256 encryption, free, no installation. Works in your browser.
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