Password Protect PDFs via API

Encrypt PDFs with user and owner passwords before delivery. Control who can open, print, or copy content - all through a single API call.

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2 Credits per request

RC4-128 Encryption

10 MB Max file size

Encrypt in one request

Terminal

$ curl -X POST "https://qkconvert.dev/api/v1/doc/protect" \
  -H "Authorization: Bearer sk_live_..." \
  -F "file=@invoice.pdf" \
  -F 'options={"user_password":"secret123"}' \
  -o invoice-protected.pdf

# 200 OK - 65ms - password-protected PDF

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Free tier includes 500 credits per month. No credit card required.

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