Lock any PDF with AES-256 encryption. Set passwords, control permissions, and download your protected file instantly.
Part of our Password Protect PDF Free suite
Lock any PDF with a password using this free, private tool. AES-256 encryption ensures your documents are protected with the strongest available standard — the same algorithm used to protect government secrets and financial transactions. Set separate user and owner passwords for layered access control, configure five independent permissions to restrict printing, copying, modifying, annotating, and form filling, and download your locked PDF instantly. The entire locking process runs locally in your browser, meaning your PDF file and password never leave your device. Unlike online PDF lockers that upload your files to remote servers for processing, this tool has zero server-side involvement. Your privacy is absolute — we cannot see, access, or store your documents under any circumstances. Lock as many PDFs as you need, as often as you want, with no usage limits or watermarks.
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.
Add an encryption layer to PDFs stored in cloud drives for double protection. Even if your cloud account is compromised, locked PDFs remain unreadable.
Lock academic submissions to prevent copying and ensure submission integrity. Restrict text copying to prevent plagiarism of your original work.
Lock archived documents with passwords to restrict access to authorized personnel only, maintaining document security over long-term storage.
Lock personal documents like medical records, financial statements, and legal papers before storing them digitally anywhere.
Always encrypt sensitive PDFs before uploading them to Google Drive, Dropbox, or OneDrive. This adds an encryption layer independent of the cloud provider's security.
Don't reuse passwords from other accounts. Generate a unique password for each important document to prevent a single compromised password from exposing multiple files.
After locking, look for the lock icon in your PDF reader's title bar or file properties. This confirms the encryption was applied successfully.
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.
Encrypt PDF files online with AES-256 encryption. No file uploads to servers. Set passwords and restrict permissions in your browser.
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.
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