Choosing a document generation API for SaaS

The SaaS-specific requirements

A general-purpose PDF generation API can render an HTML template to a PDF. That's the easy part. A document generation API for SaaS has to do more:

• Per-customer branding — every tenant in your product gets their own colors, fonts, and logo applied to the same templates.
• Tenant isolation — credentials, brand assets, and rendered documents are scoped per customer account, with no cross-tenant access.
• Template management — designers and PMs can update document layouts without a deploy.
• Sane operational characteristics — predictable latency, retries, async rendering for long documents, and webhooks.
• Auditability — you need to be able to answer "what did we send to customer X on date Y?".

Build vs buy

You can build all of this on Puppeteer or Playwright. It will take a quarter or two, plus ongoing maintenance for fonts, layout edge cases, retry logic, queueing, and a brand asset store. Most teams underestimate the long tail of bugs that come from rendering at scale across hundreds of customer brands.

If document generation is not your product's differentiator, it's almost always better to outsource it to a focused vendor. See DocRocket vs custom build for a side-by-side breakdown.

Evaluation checklist

1. Can the API render a template with this customer's brand on this request, given an account ID?
2. Can it extract a brand from a URL, or do you have to gather assets from each customer manually?
3. Are credentials tenant-scoped?
4. Is the output truly white-label (no provider strings in the PDF, fonts, or share URL)?
5. Is there a typed SDK or just raw HTTP?
6. Is there an MCP server so AI agents can call it directly without writing glue code?

Where DocRocket fits

DocRocket is built specifically for the SaaS case. One document generation API, one MCP server, per-tenant brand storage, automatic brand extraction from a URL, and white-label PDF + shareable URL output. The same primitive — generate_document — works whether it's called from your backend or from an AI agent acting on a customer's behalf.