PDF Protector – Password Protect & Encrypt PDF Online

Q: Why didn't my PDF ask for a password when opening?

You must set an Open Password. An Owner Password controls permissions but may not trigger a password prompt on open.

Q: Are my files safe and private?

Yes. All processing happens locally in your browser. No files are uploaded or stored on our servers.

Q: Does this tool change my PDF content?

It rebuilds a new PDF by rendering each page for maximum compatibility. Visual layout is preserved, but selectable text may be flattened.

Q: Will permissions always be enforced?

Not always. Some PDF viewers ignore permission flags. Open-password encryption is the strongest protection.

Drag & drop a PDF here or click to upload

Supported: PDF

Max 50MB recommended for best speed

Selected PDF (1)

Local Processing Private

document.pdf

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File size

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Pages

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Current protection

Checking…

Quick Actions

Upload a different PDF or reset

Tip

Set an open password to require a lock when opening.

⚙️ Protection Settings

Owner Password (controls permissions)

Strength: —

Used to change restrictions later. Some viewers enforce restrictions only with an owner password.

Open Password (shows lock on open)

Strength: —

If you want the PDF to prompt for a password when opening, set this.

Encryption Level

Applies to the new secured PDF generated by this tool.

Output File Name

We'll keep ".pdf" automatically.

Permissions

Allow printing Block or allow printing from PDF viewers

Allow copying Block or allow text/image copy & extraction

Allow modifications Block or allow editing/annotations

Permissions are embedded into the new protected PDF. Some viewers may still ignore certain flags.

Security Checks

Open password required

Owner password set

Recommended status

Add open password

Advanced

Redact metadata (basic) Removes common metadata fields in the new PDF

This affects the newly generated file. It does not remove hidden content inside pages.

Compatibility Note

Existing encryption

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If the PDF is already password-protected, unlock it first in a PDF editor before using this tool.

Processing... 0%

PDF Protected Successfully!

Your secured file is ready to download.

💡 Smart Tips

If you want the PDF to show a lock and ask for a password when opening, you must set an Open Password.
This tool generates a new secured PDF by rendering each page and rebuilding the document. The visual content stays the same, but internal structure may differ.
For huge PDFs, processing can be slow on mobile. Try smaller files or desktop.
If your PDF is already encrypted, unlock it first in a trusted PDF app.
Some viewers may ignore certain permissions; open password is the strongest control.

📖 How to Use This Tool

Upload your PDF by clicking the upload box or dragging the file onto it.
Set an Open Password to require a password when opening.
Optionally set an Owner Password and permissions (printing/copying/modifying).
Click "Protect PDF" and wait for processing to finish.
Download and verify the PDF prompts for a password when opened.

❓ Frequently Asked Questions

Why didn't my PDF ask for a password when opening?

Because only an Open Password forces a password prompt on open. An Owner Password controls permissions and may not show a lock prompt.

Is my PDF really encrypted?

Yes—when you set an Open Password, the output PDF will prompt for a password when opened in standard PDF viewers.

Are my files safe and private?

Yes. Processing happens locally in your browser. Files are not uploaded to our servers.

Will permissions always be enforced?

Not always. Some viewers ignore permission flags. Open-password encryption is the strongest protection.

Does this tool change my PDF content?

It rebuilds a new PDF by rendering each page. Visual layout is preserved, but selectable text and internal structure may be flattened (like a print-to-PDF).

🔒 PDF Protector