Protect PDF with Password — Free
Encrypt your PDF with a strong password instantly. 128-bit security, no signup, no watermarks, completely private.
MergeAny combines two or more JPG, JPEG, or PNG images into a single file directly in your browser — vertically, horizontally, or in a grid. There is no upload limit, no watermark, and your files are deleted from our servers seconds after merging. Works on Windows, Mac, iPhone, and Android with no install and no signup.
How to Password-Protect a PDF Online
Upload Your PDF
Select the PDF you want to password-protect — any size up to 50 MB, no account needed.
Set Your Password
Enter the password recipients will need to open the protected PDF.
Download Protected PDF
Click Protect PDF and download the encrypted file ready to share securely.
When Should You Password-Protect a PDF?
Password protection is the right choice when you need to control who can view a document. Common use cases include contracts and NDAs shared with clients, financial statements sent to investors or advisors, personnel files and HR documents, medical records and insurance documents, and confidential reports sent via email.
Password protection is particularly valuable when the document travels outside your organization — over email, via file-sharing links, or through third-party platforms — where you can't control who might intercept it. Encrypting the file means an intercepted copy is useless without the password.
Choose a strong password that you'll share securely with recipients — ideally through a different channel than the document itself (e.g., send the PDF by email and the password by text message). Write down the password somewhere safe; there is no recovery option if it is lost.
Protect PDF Features
Secure your sensitive documents with industry-standard encryption.
128-bit Encryption
Industry-standard RC4 128-bit encryption — compatible with every PDF reader worldwide.
Instant Protection
Encryption is applied server-side in milliseconds. No waiting, no queues.
Privacy First
Your PDF and password are processed in isolated server memory and deleted immediately after encryption.
Content Preserved
All text, images, layouts, and metadata are preserved exactly in the encrypted output.
Universal Compatibility
Protected PDFs open in Adobe Acrobat Reader, Apple Preview, Chrome, iOS, Android, and all major PDF apps.
No Signup, No Watermark
Free, browser-based. No account required. Output PDF has no MergeAny branding.