PDFops
Deterministic PDF fill & merge for the edge
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.
Features
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
No headless browser and no native deps, runs on any edge or serverless runtime
Typed zero-dep SDK, an MCP server and an n8n community node
Use Cases
Filling government and tax forms from application data
Generating invoices and receipts from a serverless function
Bulk-filling contracts or onboarding packets from a CSV
Letting an AI agent fill and merge PDFs over MCP
Merging generated reports into one document for delivery
Comments
Built this because every serverless project I touched eventually needed to write a PDF, and the usual answer is ship a headless Chromium, which you cannot do inside a Worker or a small Lambda. PDFops does the fill, merge and invoice cases over plain HTTP instead, with byte-deterministic output so you can diff the result in CI. Happy to answer anything about the determinism guarantees or the MCP server.
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Comments
Built this because every serverless project I touched eventually needed to write a PDF, and the usual answer is ship a headless Chromium, which you cannot do inside a Worker or a small Lambda. PDFops does the fill, merge and invoice cases over plain HTTP instead, with byte-deterministic output so you can diff the result in CI. Happy to answer anything about the determinism guarantees or the MCP server.
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