Lock any PDF with a password in seconds. Set an opening password and optionally restrict printing, copying, and editing.
Part of our Password Protect PDF Free suite
Lock your PDF files with a password so only authorized people can open them. This free tool runs entirely in your browser — no file uploads, no cloud processing, no risk of data leaks. Choose a strong password and download your locked PDF in seconds. You can also set an owner password to retain administrative control over the document, and configure five independent permission settings to restrict what recipients can do with the file even after entering the correct password. The locking process uses AES-256 encryption, the same standard trusted by financial institutions and government agencies worldwide. Once locked, the PDF cannot be opened without the correct password, and the encryption cannot be bypassed through any practical means.
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.
Lock invoices and receipts before emailing to clients to prevent tampering with amounts, payment terms, or bank details.
Protect thesis drafts and research papers before peer review submission to prevent unauthorized copying or early distribution.
Lock sensitive personal documents like tax returns and ID scans before storing them in cloud drives for an extra security layer.
Protect patent applications, design documents, and proprietary research from unauthorized access during the review process.
Use at least 12 characters mixing letters, numbers, and symbols. Avoid common words or patterns like '123456' or 'password'. A passphrase like 'correct-horse-battery-staple' is both strong and memorable.
Even with the opening password, you can prevent users from printing or copying content by unchecking those permissions before locking the file.
Never send the password in the same email as the locked PDF. Use a different communication channel like a text message, phone call, or secure messaging app.
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.
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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