What Is PDF Password Protector?
PDF Password Protector adds encryption and password requirements to your PDF files. Use it to secure confidential reports, financial statements, legal documents, or any file you need to share but want to restrict access to authorized readers only.
How to Use This Tool
Upload a PDF, set your desired password, and choose permission settings such as whether to allow printing or copying. The tool encrypts the document client-side and provides the protected PDF for download. Your original file and password never leave your browser.
Why Use PDF Password Protector?
Encrypting PDFs typically requires Adobe Acrobat or paid security software. This tool applies industry-standard PDF encryption entirely in your browser, so your sensitive files and passwords are never transmitted to any server. For a detailed walkthrough, see our step-by-step guide.
See also: If you need to remove a password rather than add one, the PDF Unlock reverses this operation for PDFs you have the rights to.
Frequently Asked Questions
What encryption does this use?+
AES-128 encryption, which is supported by every modern PDF reader including Adobe Acrobat, Preview, Chrome, Firefox, and mobile viewers.
Is my PDF uploaded to a server?+
No. Encryption happens in your browser. Neither the PDF nor the password ever leaves your device.
What's the difference between user and owner password?+
The user (open) password is required to view the document. The owner (permissions) password is required to change permissions like printing or copying. If you only want to restrict actions but allow viewing, set only an owner password.
Can a password-protected PDF be cracked?+
AES-128 is a strong modern cipher. The real risk is a weak password. Use at least 12 characters with a mix of letters, numbers, and symbols, and do not reuse passwords.
What encryption strength does the tool apply?+
AES-256 — the same encryption used by the PDF 1.7 spec and trusted by financial and legal industries. AES-128 is also selectable for older reader compatibility.
Can I set separate user and owner passwords?+
Yes. The user password unlocks the document for reading. The owner password additionally controls permissions — whether printing, copying, or editing are allowed when opened.
What permissions can I restrict?+
Print (high or low resolution), copy text/images, modify the document, fill forms, add annotations, extract pages, and assemble pages. Each is independently togglable.
Is browser-side encryption as secure as desktop software?+
Yes. The encryption math (AES-256) is the same; the key is derived from your password using PBKDF2 with the same iteration count as Adobe Acrobat. The advantage of running in-browser is that the password never leaves your device.
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Encryption is real AES-128 with separate user and owner passwords, not the cosmetic ZIP-style password some free converters apply. Granular permissions let you allow printing while blocking copy, or allow viewing while blocking edits and form-fill — the same flag set Adobe Acrobat exposes. The protected PDF can be opened in any standards-compliant reader; passwords never leave your browser, and the original file is never uploaded anywhere. Good for sending sensitive documents over email.