Requirements for a passport scan
- Safe size target: 1 MB
- Usual paper format: A4
- Contains personal data: add a password before emailing it.
- Limits differ between organizations: always check the maximum size shown on the upload form.
How to use Protect PDF
- 1
Drag and drop your PDF files into the upload area, or click “Select files”.
- 2
Check the options — they are already pre-set for this page.
- 3
Click “Protect PDF”. Your file is processed in RAM in a few milliseconds.
- 4
Download the result, or continue with another tool without uploading again.
🛡️ Zero-Storage Architecture
Your files are processed in volatile RAM and never written to disk.
- ✓ In-memory processing, memory released immediately
- ✓ No account, no copy kept, no document logs
- ✓ HTTPS encryption in transit
Frequently asked questions
What file size is accepted for a passport scan?+
Many passport scan upload portals accept files up to around 1 MB. Limits vary between organizations, so always check the maximum shown on the form.
How do I protect a passport scan sent by email?+
Use Protect PDF to encrypt the file with AES-256 and share the password through another channel (SMS, phone call).
Is Protect PDF really free?+
Yes. UnboltPDF is free and unlimited: no sign-up, no watermark, no daily quota. The service is financed by advertising.
Are my files safe?+
Your files are processed in volatile memory (RAM) and are never written to a disk. The memory is released as soon as the result is sent back to you. We do not keep copies or log document contents.
What is the maximum file size?+
You can upload up to 50 MB per task, and up to 40 files for tools that accept several files.
Does it work on phones, Mac and Windows?+
Yes. Everything runs in your web browser: Chrome, Safari, Firefox and Edge on desktop, Android and iPhone. Nothing to install.