PDFIO API Documentation

Welcome to the PDFIO developer documentation. PDFIO provides simple HTTP APIs for common PDF operations such as image to PDF conversion.

Base URL:
https://api.pdfio.org

Authentication

All PDFIO APIs require an API key. Requests without a valid key will be rejected.

Pass your API key using the Authorization header:

Authorization: Bearer YOUR_API_KEY

To request an API key, email pdfioorg@gmail.com with a brief description of your use case.

Endpoint: Convert Images to PDF

POST /convert

Converts one or more image files into a single PDF. Images are added to the PDF in the order they are uploaded.

Supported formats

JPEG (.jpg, .jpeg)
PNG (.png)
TIFF (.tiff)

Request

Send a multipart/form-data request with one or more files fields.

curl -X POST https://api.pdfio.org/convert
  -H "Authorization: Bearer YOUR_API_KEY"
  -F "files=@page1.jpg"
  -F "files=@page2.png"
  --output output.pdf

Response

On success, the API returns:

Status: 200 OK
Content-Type: application/pdf
Response body: PDF binary

Error responses

400 – Invalid input or unsupported file type
401 – Missing or invalid API key
429 – Rate limit or quota exceeded
500 – Server error

Limits & Quotas

API keys are subject to:

IP-based rate limiting
Per-key daily quotas
Maximum upload size limits

Limits vary by use case and may change as the platform evolves.

Roadmap

PDFIO is actively expanding. Planned APIs include:

PDF merge and split
OCR (searchable PDFs)
Page extraction and reordering
Metadata and compliance utilities

Support

For questions, feedback, or API access:

📧 pdfioorg@gmail.com