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Show HN: DocFast – HTML/Markdown to PDF API with built-in invoice templates (100 free/mo)

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Hi HN,

I built DocFast (https://docfast.dev) — a simple API that converts HTML, Markdown, or URLs to PDF.

Why I built it: Every project I've worked on eventually needs PDF generation. Setting up Puppeteer, dealing with Chrome memory leaks in production, managing headless browser instances — it's always more painful than it should be. I wanted something where I could just POST some HTML and get a PDF back.

What makes it different:

Markdown endpoint — most PDF APIs only accept HTML. DocFast has a native /v1/convert/markdown endpoint with syntax highlighting.
Built-in templates — pass JSON data to /v1/templates/invoice/render and get a professional invoice PDF. No HTML required.
Fast — persistent browser pool, no cold starts. Sub-second generation for most documents.
Privacy — your data is never stored. PDFs are generated and streamed directly.

Pricing: Free tier gives you 100 PDFs/month with access to all endpoints and templates. Pro is $9/month for 10,000 PDFs.

Quick example:

curl -X POST https://docfast.dev/v1/convert/markdown \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"markdown": "# Hello World\n\nGenerated by DocFast."}' \
  -o hello.pdf

You can get an API key instantly at https://docfast.dev — just an email, no credit card.

I'd love feedback on the API design, pricing, or anything else. Happy to answer questions.

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