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HTML to PDF API Alternatives — Puppeteer, iText & When to Use RatPDF

Compare HTML to PDF APIs: Puppeteer, wkhtmltopdf, Gotenberg, SaaS renderers, and browser tools. CSS pitfalls and decision tree for developers.

Published July 2, 2025 · 1 min read

Written by Ethan Brooks · Editor-in-Chief & Product Lead

Reviewed by James Cole

Last reviewed January 15, 2026 · Editorial policy

Teams pick an HTML to PDF API when invoices, tickets, or reports must render server-side — but the market spans headless Chrome, legacy WebKit wrappers, and hosted SaaS. This guide compares common approaches and when RatPDF's browser HTML to PDF tool fits (no deploy, no API key).

HTML to PDF API alternatives compared

Approach	Best for	Trade-offs
Puppeteer / Playwright	Full CSS3, SPAs after render	Ops overhead — Chrome in Docker, memory per job
wkhtmltopdf	Legacy templates, simple HTML	Stale WebKit; flexbox gaps; maintenance mode
iText html2pdf / OpenPDF	Java/.NET server PDF stacks	No JS execution; inline CSS works best
Gotenberg	Self-hosted API wrapping Chromium	You run and scale the container fleet
DocRaptor / PDFShift / similar SaaS	Managed API, SLA, PrinceXML option	Per-document cost; data leaves your VPC
Browser print → PDF	One-off exports	Not automatable; margins inconsistent
RatPDF HTML to PDF	Ad-hoc templates, QA renders, small batches	Not a REST API — browser upload; 3 free uses/day

Decision tree

Need JavaScript to run? → Puppeteer, Playwright, or Gotenberg — not static html2pdf alone.
100% self-contained HTML + CSS? → iText html2pdf (RatPDF uses this) or wkhtmltopdf for simple layouts.
Don't want to operate Chrome? → Hosted API (DocRaptor, PDFShift) or RatPDF for manual batches.
Unicode invoices (₹, €, CJK)? → Embed fonts in HTML; test with same engine as production.

CSS and font pitfalls (all engines)

Use @page { size: A4; margin: 20mm; } for print margins — not body padding alone
Prefer inline or embedded CSS; relative url(font.woff2) paths break on server render
Test with production HTML snapshot — not live SPA URLs that need auth cookies
Page breaks: page-break-before: always on section headers

Original example: invoice template QA

Startup renders GST invoice HTML from their Node app via Puppeteer in production. Designer updates CSS — staging API queue is backed up. Developer pastes static HTML into RatPDF HTML to PDF, verifies table alignment and ₹ symbol in 30 seconds, then promotes CSS to Puppeteer template. Production API unchanged; RatPDF used as visual regression shortcut.

When RatPDF is enough vs when you need an API

Scenario	RatPDF tool	Self-hosted API
Monthly manual report export	Yes	Overkill
1000 tickets/hour from queue	No	Yes — Puppeteer/Gotenberg
CI snapshot test of one template	Yes	Optional
Customer-facing SLA + retry logic	No	Yes — hosted or own fleet

Related resources

Try HTML to PDF →

Sources & references

Primary references used when researching and fact-checking this guide. See our editorial methodology.

iText html2pdf — HTML to PDF — iText Group
HTML/CSS to PDF conversion engine used in server-side Java and .NET stacks.
Adobe PDF Reference — encryption — Adobe
PDF password protection and encryption standards (ISO 32000).