Encrypt PDF with Password
Secure sensitive documents with password encryption before sharing or uploading. Set a password and only authorized recipients will be able to open your PDF.
Drop your PDF here
or click to browse files
Supported format: .pdf
Sending sensitive documents by email or uploading them to shared platforms? Encrypt your PDF with a password first. OmnisPDF adds industry-standard encryption so only people with the password can open your file — protecting contracts, financial records, medical documents, and more.
- ✓ Add strong password encryption to any PDF
- ✓ Industry-standard AES encryption
- ✓ Content, formatting, and quality fully preserved
- ✓ Works on Mac, Windows, iOS, Android, and Linux
- ✓ No installation — encrypt PDFs directly in your browser
Encrypt PDFs Before Sending by Email
Email is not secure by default. Before attaching sensitive contracts, tax documents, or personal records, encrypt them with a password. Share the password separately via text or phone call for maximum security.
Secure Confidential Reports and Financial Documents
Financial statements, audit reports, and internal memos contain information that should only be seen by authorized eyes. Encrypt these PDFs before uploading to cloud storage or sharing with stakeholders.
Protect Legal Documents with Encryption
Contracts, NDAs, and legal agreements require confidentiality. Adding password encryption ensures that only the intended parties can access the document, even if the file is intercepted or forwarded.
How to Encrypt a PDF with a Password
Upload or drag and drop your PDF into OmnisPDF.
Enter a strong password to protect your document.
Click Protect PDF — encryption is applied instantly.
Download your encrypted PDF and share it securely.
Frequently Asked Questions
What encryption does OmnisPDF use to protect PDFs?
OmnisPDF uses industry-standard AES encryption to protect your PDF files. This is the same encryption standard used by banks and government agencies to secure sensitive data.
How do I open an encrypted PDF?
Anyone who receives the encrypted PDF will need to enter the password you set in order to open it. Standard PDF readers like Adobe Acrobat, Preview, and Chrome's built-in viewer all support password-protected PDFs.
Can I remove the encryption later?
Yes. Use OmnisPDF's Unlock PDF tool to remove the password protection. You will need to enter the current password to decrypt the file.
Will encrypting a PDF change its content or quality?
No. Encryption adds password protection without altering the content, layout, images, or quality of your PDF. The document remains identical — it just requires a password to open.
Can I encrypt a PDF on my phone?
Yes. OmnisPDF works in mobile browsers on iPhone and Android. Upload your PDF, set a password, and download the encrypted file — no app required.
Is it safe to encrypt PDFs with OmnisPDF?
Yes. Your files are processed securely and deleted from our servers after your session ends. We never store your passwords or share your documents.