Password Protect PDF Free. AES-256 Encryption. Browser-Only.

RepetiGo's free password protect PDF tool applies AES-256 encryption - the strongest available standard for PDF password protection - directly in your browser. No server upload. No Adobe Acrobat subscription.

Set an open password to restrict who can open the document. Add permission controls to prevent printing, copying, or editing. Both layers can be applied together in one step.

✓ AES-256 Encryption - Stronger Than Most Paid Tools ✓ Open Password + Permission Controls ✓ No Adobe Required ✓ Browser-Only - File Never Uploaded

Protecting a PDF adds a password that must be entered before the document can be opened - and optionally restricts what the person who opens it can do with it. Without the correct password, the PDF cannot be read by anyone.

PDF protection uses PDF encryption - the document's content is mathematically scrambled so that it is unreadable without the decryption key. RepetiGo uses AES-256 (Advanced Encryption Standard, 256-bit) - the same standard used by banks and government systems, and stronger than the AES-128 used by many older or cheaper PDF tools.

Once the document is unlocked with the open password, permission controls restrict what the reader can do:

• Allow Printing: if unchecked, the reader cannot print the document even after opening it

• Allow Copying: if unchecked, the reader cannot copy or extract text from the document

• Allow Editing: if unchecked, the reader cannot modify the document using a PDF editor

You can set an open password with no permission restrictions (open and use freely), permission restrictions with no open password (anyone can open, but cannot copy/edit/print), or both layers together (most secure).

Enter your open password (required, minimum 4 characters). Optionally enter a separate owner password for additional control. Set your permission preferences: Allow printing, Allow copying, Allow editing - toggle each on or off.

Click Protect PDF. The AES-256 encryption is applied in your browser. Download the protected PDF. The file is processed entirely in your browser - nothing is uploaded to any server.

RepetiGo uses AES-256 encryption - Advanced Encryption Standard with a 256-bit key. This is:

• Stronger than AES-128, which is what many older PDF tools and PDF 1.6 standard tools use

• The same standard used by banks, government systems, and enterprise security software worldwide

• Compliant with current PDF encryption standards (PDF 2.0 / PDF 1.7)

• Recognised under India's IT Act 2000 as an acceptable encryption mechanism for electronic documents

🔒 AES-256 means an attacker would need to try 2²⁵⁶ possible keys to break the encryption by brute force - a number larger than the estimated atoms in the observable universe. The practical strength of your protection depends most on the strength of your password choice.

Adobe Acrobat Pro can password protect PDFs - but requires a paid subscription. RepetiGo lets you protect a PDF without Adobe for free, with stronger encryption (AES-256 vs Acrobat's default AES-128 in some versions), and without uploading your document to any server.

• Government portal submissions: Password-protect financial statements, income certificates, and legal affidavits before submitting to portals that handle sensitive personal data

• Academic documents: Mark sheets, degree certificates, and recommendation letters sent to institutions - protect them from modification during transit

• Legal and compliance documents: Contracts, agreements, and board resolutions circulated to multiple parties - permission controls prevent unauthorised editing

• Business documents: Price lists, internal policies, and reports shared with external partners - prevent copying and distribution of proprietary content

⚠️ Under India's DPDP Act 2023, documents containing personal data (Aadhaar numbers, PAN, financial data) should be protected during electronic transmission. AES-256 password encryption is a recognised and practical measure for this purpose.

RepetiGo's PDF tools run entirely in your browser. Your file is never uploaded to any server.

RepetiGo uses AES-256 - the strongest PDF encryption standard available. This is stronger than the AES-128 used by some older tools and fully compliant with current PDF encryption standards.

Yes - use RepetiGo's Unlock PDF tool at Open Unlock PDF. Enter the correct open password to decrypt the PDF and download an unprotected version.

An open password encrypts the document - nobody can read it without the password. Permissions restrict what an authorised reader (who knows the password) can do: printing, copying text, or editing. You can use either layer independently or both together.

AES-256 encryption is extremely strong - the security of a protected PDF depends primarily on the strength of the password you choose. Use a long password with mixed characters for sensitive documents. With RepetiGo, the protection is applied in your browser - the file is never uploaded, so there is no transmission risk during the protection process itself.