PDFops

PDFops is a hosted HTTP API for the PDF work that keeps getting reinvented: fill AcroForm fields, merge documents, generate invoices. No headless Chromium and no native dependencies, so it runs anywhere a fetch call does, including Vercel, Cloudflare Workers, Lambda, Deno Deploy and Bun. Fills are byte-deterministic, which is what makes them testable in CI: same input, same bytes. There is an MCP server too, so agents can call it over stdio without a key.

What you get

• Fill AcroForm fields from a JSON map, flatten optional
• Merge multiple PDFs in one request
• Generate invoices from structured data
• Inspect any PDF's form fields, no signup needed
• Byte-deterministic output, diffable in CI
• Runs on any edge or serverless runtime, no native deps
• Typed zero-dep SDK, an MCP server and an n8n community node
• Free tier: 250 requests/month with an emailed API key