Password Protect PDF
Add an open password and owner restrictions to any PDF. Encryption runs entirely in your browser — your file never leaves your device.
Allow recipients to perform these actions even without the owner password:
How to Password Protect a PDF — Encrypt and Restrict Access Free
LovelyPDF applies AES-256 encryption to your PDF directly in the browser using pdf-lib. You can set an open password (anyone opening the file must enter it), an owner password (controls whether the recipient can print, copy text, or edit), or both. The encrypted file is fully compatible with Adobe Acrobat, macOS Preview, Chrome's PDF viewer, and all mobile PDF apps. Your file and passwords never leave your device.
Password-protecting PDFs is standard practice in several Indian professional contexts. CAs and tax consultants send client financial statements, audit reports, and ITR computations over WhatsApp or email with an open password — typically the client's PAN number — so that only the intended recipient can open it. Banks and NBFCs send loan sanction letters and account statements as password-protected PDFs, with the password communicated through a separate channel. Advocates share confidential settlement agreements and demand notices with a view-only password, and separately restrict printing and copying with the owner password to prevent the document being printed and used out of context. HR teams email offer letters protected with the candidate's date of birth as password.
How to Password Protect Your PDF
- Upload your PDF by clicking or dragging it onto the tool
- Enter an Open Password if you want the recipient to need a password just to view the file
- Enter an Owner Password if you want to control printing, copying, or editing permissions
- Select which actions to allow (print, copy text, fill forms, etc.)
- Click Protect PDF and download your encrypted file
Open Password vs Owner Password — Practical Difference
An open password locks the entire document — nobody can read it without entering the password first. An owner password is invisible to viewers; the document opens normally, but restricted operations (printing, selecting text, editing) are blocked by the PDF reader. Banks commonly use owner-password-only restrictions on statements to prevent editing the figures. For maximum security on highly sensitive documents, set both: a strong random open password and a separate owner password to block printing.
Frequently Asked Questions
What encryption strength does LovelyPDF use?
AES-256, the strongest encryption level in the PDF standard. This is the same standard used by Adobe Acrobat Pro. It is compatible with all modern PDF readers including Adobe, macOS Preview, Chrome, Foxit, and mobile apps.
Is it safe to set the password in the browser?
Yes. Encryption runs entirely in JavaScript on your device. Your PDF and your passwords are never sent to any server. This is critical for financial statements, medical records, and legal documents.
What should I use as the password for sending documents to clients?
A common convention in India is to use the recipient's PAN number, date of birth (DDMMYYYY), or mobile number as the password, since it is easy to communicate verbally without writing it in the same email as the document.
Can the owner password be bypassed?
Technically, some PDF tools can strip owner-password restrictions. Owner passwords are a deterrent, not an absolute technical lock — they prevent casual copying and printing in compliant PDF readers but won't stop a determined user with specialist software. For absolute copy prevention, consider converting to a password-protected image PDF using the PDF to Image tool first.
Related tools: Remove PDF Password · Watermark PDF · Edit Metadata