Save a template. Fill it with data from anywhere.

Send JSON from your code, your AI agent, or Claude and ChatGPT over MCP, and get a hosted PDF or image link back. Same data, same layout.

Get an API key

https://mcp.ojo.so/mcp

30 free credits. No card.

Invoice template, with customer.name and invoice.number marked — Three senders fill one saved template, and each gets back a link to its own PDF.

Invoice INV-2026-0151 for Northwind Ltd. — Three senders fill one saved template, and each gets back a link to its own PDF.

Every PDF your app sends needs a browser running somewhere.

Aspect	Run it yourself	oJo
Browser	you run, patch and size Chromium	oJo runs it, you send JSON
Fonts and page layout	installed and pinned on every server	set up once, previewed before you save
Files	you store and serve them	a hosted link in the response

The same request either way. On one side you keep three things running.

From a design to a file in three steps.

Make the template.
Paste your HTML, start from a gallery template, or have your AI write it over MCP. The template is HTML, CSS and Handlebars.
{{recipientName}}{{course}}
Save it to oJo.
It gets an ID. Change it later and every render after the save uses the new version.
Template IDa41d…07c2
Send data, get a file.
Your app or agent posts JSON with the template ID. The response holds the file's URL, and for a PDF its page count and the credits it used.

curl -X POST https://api.ojo.so/v1/pdf/template \
  -H "Authorization: Bearer <your API key>" \
  -H "Content-Type: application/json" \
  -d '{"templateId": "a41d…07c2", "modify": {"course": "Data Engineering"}, "pages": [
    {"modify": {"recipientName": "Ada Lovelace"}},
    {"modify": {"recipientName": "Grace Hopper"}},
    {"modify": {"recipientName": "Alan Turing"}}
  ]}'

Response

{
  "pdfUrl": "user-content.example/4f2a91c3/0d6b2f8e41a94c7d.pdf",
  "pages": 3,
  "credits": 1
}

certificates.pdf, 3 pages

Certificate of completion for Ada Lovelace, Data Engineering, page 1 of 3

Certificate of completion for Grace Hopper, Data Engineering, page 2 of 3

Certificate of completion for Alan Turing, Data Engineering, page 3 of 3

Page 1 of 3

Many images at once: POST /v1/image/bulk renders up to 50 images a call.

Your AI designs the template. oJo renders it.

Writing the template is the slow part. Ask Claude or ChatGPT to write it over MCP, preview it and save it. From then on your code sends the data.

Connect any MCP client with your oJo account. MCP sits on the same API, templates and credits.

Design and save: create_template
Preview before you save: create_preview_link
Render a PDF or an image: generate_pdf_from_template generate_image_from_template

Connect your AI