Protect PDF Files with a Password via API
Add password protection to any PDF document via REST API. Upload your file and password as multipart/form-data and receive an encrypted PDF in response. Perfect for securing sensitive documents in automated workflows.
# Protect a PDF with a password
curl -X POST \
https://api.convertfilefast.com/v2/pdf/protect \
-H "Authorization: Bearer YOUR_API_KEY" \
-F "file=@document.pdf" \
-F "password=MySecretPassword123" \
--output protected.pdf
# HTTP 200 OK — Content-Type: application/pdfAdvantages
Why use our API?
Complete and reliable solution for integration in any tech stack.
Strong Encryption
PDF files are encrypted with AES-256 standard. Password-protected PDFs cannot be opened without the correct password.
Simple Multipart Upload
Upload your PDF and password as form fields. Receive the protected PDF binary in response. No complex configuration.
Automation Ready
Integrate password protection into document generation pipelines. Protect contracts, invoices, and reports automatically.
n8n Workflow Support
Trigger PDF protection from any n8n workflow — after generating a report, receiving an email, or completing a form.
Bulk Protection
Loop through batches of PDF documents and protect each one with a unique or shared password via API calls.
Zero Storage
Both the original and protected PDFs are processed in memory and deleted immediately. Your documents are never stored.
Start Protecting PDFs via API
Get your API key and add password protection to PDF files in seconds. Free plan includes 10 conversions per month.
No credit card. 10 free conversions on Free plan.