Protect a PDF
Secure your PDF with a password — 128-bit encryption, server-side processing.
Protect a PDF →How to protect a PDF
- Click "Protect a PDF"
- Drag and drop or select your PDF file
- Choose the Protect option from the output list
- Enter your desired password
- Download your encrypted PDF
Frequently asked questions
What encryption level is used?
The PDF is encrypted with RC4 128-bit via qpdf, compatible with all modern PDF readers.
Does CoreConverter store my password?
No. The password is never stored — it is used only during processing, in memory.
Can I protect an already-protected PDF?
You will need to unlock it with its current password before re-protecting it.
What encryption level is used?
The PDF is encrypted with RC4 128-bit via qpdf, compatible with all modern PDF readers.
Does CoreConverter store my password?
No. The password is never stored — it is used only during processing, in memory.
Can I protect an already-protected PDF?
You will need to unlock it with its current password before re-protecting it.
What encryption level is used?
The PDF is encrypted with RC4 128-bit via qpdf, compatible with all modern PDF readers.
Does CoreConverter store my password?
No. The password is never stored — it is used only during processing, in memory.
Can I protect an already-protected PDF?
You will need to unlock it with its current password before re-protecting it.
What encryption level is used?
The PDF is encrypted with RC4 128-bit via qpdf, compatible with all modern PDF readers.
Does CoreConverter store my password?
No. The password is never stored — it is used only during processing, in memory.
Can I protect an already-protected PDF?
You will need to unlock it with its current password before re-protecting it.
Can I protect an already-protected PDF?
You will need to unlock it with its current password before re-protecting it.
Does CoreConverter store my password?
No. The password is never stored — it is used only during processing, in memory.
What encryption level is used?
The PDF is encrypted with RC4 128-bit via qpdf, compatible with all modern PDF readers.
Can I protect an already-protected PDF?
You will need to unlock it with its current password before re-protecting it.
Does CoreConverter store my password?
No. The password is never stored — it is used only during processing, in memory.
What encryption level is used?
The PDF is encrypted with RC4 128-bit via qpdf, compatible with all modern PDF readers.
Can I protect an already-protected PDF?
You will need to unlock it with its current password before re-protecting it.
Does CoreConverter store my password?
No. The password is never stored — it is used only during processing, in memory.
What encryption level is used?
The PDF is encrypted with RC4 128-bit via qpdf, compatible with all modern PDF readers.
Can I protect an already-protected PDF?
You will need to unlock it with its current password before re-protecting it.
Does CoreConverter store my password?
No. The password is never stored — it is used only during processing, in memory.
What encryption level is used?
The PDF is encrypted with RC4 128-bit via qpdf, compatible with all modern PDF readers.