Protect PDF Online

Encrypt your PDF documents with secure passwords

Drag & drop PDF files here

or click to browse from your computer

Select Files

Lock Down Your PDFs Like a Vault

Some things aren't meant for everyone's eyes. Whether it's a sensitive contract, a bank statement, or just a private diary you've turned into a PDF, our encryption keeps it safe. Set a strong password, and we'll wrap your document in a layer of protection that even the nosiest person can't crack.

Why Choose iHatePDF's Protection?

Strong Encryption

We use standard PDF encryption that is widely compatible yet unbreakable without the password.

Client-Side Privacy

Processing happens entirely in your browser. Your files and passwords never touch our servers.

Bulk Protection

Password protect multiple PDF files at once. You can use the same password for all or unique ones for each.

Password Strength

Our built-in strength meter helps you create passwords that are hard to guess.

Instant Process

No uploading or downloading delays. Encrypt large files instantly on your device.

100% Free

Secure as many documents as you need without any cost or registration.

Perfect for Every Need

Business Contracts

Ensure NDAs, employment contracts, and sensitive B2B agreements are only seen by authorized personnel with robust password protection.

Financial Security

Protect bank statements, tax returns, and investment reports with strong encryption before sharing them via email or storing them in the cloud.

Academic Integrity

Secure your research data, thesis drafts, and confidential academic records to prevent unauthorized copying or preemptive distribution of your work.

AES-256 Encrypted

How to Encrypt PDF Files

Upload PDF

Select the files you want to secure.

Set Password

Choose a strong, unique password.

Repeat

Confirm the password to avoid typos.

Encrypt

Click 'Protect PDF' to finish.

Explore More Tools

Other tools you might find useful

Unlock PDF

Remove PDF password security

Organize PDF

Rearrange, rotate and delete pages

Merge PDF

Combine multiple PDFs into one document

Frequently Asked Questions

Common questions about PDF protection

Upload your PDF, enter your desired password in the "Password" field, confirm it, and click "Protect PDF".

Yes! We use standard PDF encryption. The process runs entirely in your browser, so we never see your files or your passwords.

Yes, you can upload multiple files and set a unique password for each, or sync the same password to all files.

You should first unlock the PDF using our Unlock PDF tool (if you know the password), and then protect it again with a new password.