Protect PDF
Online (Free)
Add a password to your PDF so it can’t be opened without it. Upload one PDF or multiple PDFs — set a password — and download your protected file in seconds.
No account • No watermark • Files auto delete • Completely free • Supports single & bulk uploads
Protect PDF Online Free – Add a Password in Seconds
Want to share a PDF but keep it private? PDFLinx Protect PDF lets you add a password so your file can’t be opened without it. You can also set optional permissions (printing, copying, editing) for extra control. Works for single and bulk files.
Password Protected
Set an open password so only the right people can view the PDF.
Optional Permissions
Control printing, copying, and editing using owner permissions.
Fast Downloads
Single file downloads as PDF. Multiple files download as a ZIP.
Protect PDF in 3 Easy Steps
Upload PDF(s)
Upload one PDF or multiple PDFs at once.
Set Password
Enter the password required to open the PDF.
Download
Download protected PDF (or ZIP if multiple files).
PDFLinx helps you protect PDFs quickly — private sharing, simple controls, always free.
Protect PDF with Password – Secure PDF Online by PDFLinx
Protecting PDF files with a password is essential when you want to keep sensitive information private. PDF documents often contain personal, financial, legal, or business data that should not be accessible to everyone. PDFLinx Protect PDF tool allows you to add password protection to your PDF files online, ensuring only authorized users can open or view them.
What Does Protecting a PDF Mean?
Protecting a PDF means encrypting the file with a password so unauthorized users cannot open, view, or modify its contents. Once protected, the PDF requires a password to access, making it much safer for sharing over email, cloud storage, or messaging platforms.
Why Should You Protect PDF Files?
- Prevents unauthorized access to sensitive documents
- Protects confidential business, legal, or financial data
- Adds an extra layer of security when sharing PDFs online
- Helps maintain data privacy and compliance
- Prevents accidental editing or misuse of documents
How to Protect a PDF with Password Online
- Upload your PDF file using the Protect PDF tool
- Enter a strong password to secure the PDF
- Click the “Protect PDF” button
- Download your password-protected PDF instantly
No registration required. Your files are processed securely and never stored permanently.
Features of PDFLinx Protect PDF Tool
- Free online PDF password protection
- Strong encryption for secure PDFs
- Protect PDFs without installing software
- Fast and easy password setup
- Works on all devices and browsers
- No watermark added to your files
- No file storage – privacy focused
- Secure sharing of sensitive documents
- Simple and user-friendly interface
Who Should Use the Protect PDF Tool?
- Businesses: Secure contracts, invoices, and reports
- Professionals: Protect resumes and confidential files
- Students: Secure academic documents and projects
- Freelancers: Share work safely with clients
- Individuals: Protect personal or financial documents
Is PDFLinx Protect PDF Safe?
Yes. PDFLinx is designed with privacy in mind. Uploaded PDF files are processed automatically and removed shortly after protection. Your files are never shared or saved permanently.
Protect Your PDFs Anytime, Anywhere
PDFLinx works seamlessly on Windows, macOS, Linux, Android, and iOS. All you need is an internet connection and a modern browser to protect your PDFs with a password anytime, anywhere.
Frequently Asked Questions
Is the Protect PDF tool free?
Yes. PDFLinx Protect PDF is free to use — no sign-up, no watermark.
What password do I need to remember?
The “open password” (user password) is required to open the PDF. If you set an owner password, keep it only if you want to change permissions later.
Can I protect multiple PDFs at once?
Yes. Upload up to 10 PDFs. Multiple files download as a ZIP.
Will protecting a PDF change content or quality?
No. Adding password protection does not change the text, images, or layout — it only adds security settings.
Are my files safe?
Yes. Files are processed automatically and deleted after processing.
