DocRaptor Alternative
PDFBolt HTML to PDF API
A Chromium-powered alternative to DocRaptor with full CSS Grid, modern JavaScript, and significantly lower pricing.
Same quality you expect from a cloud PDF API – with the rendering engine the modern web is built on.
Modern CSS
vs No CSS Grid
Full JavaScript
vs ES5 Only
$19 for 2,000 Docs
vs $75 for 1,250 Docs
100 Free/Mo
vs 5 Free/Mo
Prince Engine
DocRaptor
Cloud HTML to PDF API powered by the Prince XML rendering engine. Founded in 2010, acquired by Artifex Software in 2025. Prince is a CSS‑to‑PDF converter – not a browser engine. It excels at CSS Paged Media (footnotes, page floats, margin boxes) but does not yet support CSS Grid. Official libraries for Ruby, Python, Node.js, PHP, Java, and C#.
Chromium Engine
PDFBolt
PDF generation API that converts HTML, URLs, and reusable templates to PDF using a real Chromium browser. Full CSS Grid, Flexbox, and JavaScript support – renders exactly what you see in Chrome. Three endpoints (Direct, Sync, Async), HMAC‑SHA256 signed webhooks, direct S3 upload, and AI‑powered template generation.
DocRaptor vs PDFBolt: Feature Comparison
Rendering, CSS support, PDF features, and pricing compared side by side.
DocRaptor | PDFBolt | |
|---|---|---|
| Rendering | ||
Engine | Prince XML | Chromium |
JavaScript | ES5 only | Full modern JS |
| CSS | ||
CSS Grid | ||
CSS Paged Media (footnotes, page floats) | ||
| PDF Features | ||
Print Production (PDF/X, CMYK) | ||
PDF/A Compliance | ||
Reusable Templates | ||
Direct S3 Upload | ||
| Pricing | ||
Free Production Docs | 5/mo | 100/mo |
Starting Paid Plan | $15/mo (125 docs) | $19/mo (2,000 docs) |
Per-Document Cost | from $0.025 | from $0.005 |
Why Switch from DocRaptor to PDFBolt
DocRaptor uses the Prince XML engine, first released over two decades ago.
For modern web content, a Chromium-based API delivers better CSS and JavaScript support at a lower price.
No CSS Grid support
DocRaptor’s Prince engine supports Flexbox but not CSS Grid. Layouts built with Tailwind CSS, Bootstrap 5, or Material UI that rely on Grid will not render correctly. Their documentation confirms: “We do not yet support CSS Grid, but expect to do so soon.” PDFBolt uses Chromium with full Grid and Flexbox support.
Limited JavaScript (ES5 only)
DocRaptor uses PhantomJS for JavaScript execution, which only supports ES5. No native arrow functions, Promises, or async/await. Modern frameworks require Babel transpilation to ES5 before they can run. PDFBolt runs a real Chromium browser with native ES6+ support – no transpilation needed.
Significantly higher pricing
DocRaptor is 3-6x more expensive depending on volume. DocRaptor’s Premium plan costs $75/mo for 1,250 docs vs PDFBolt’s $19/mo for 2,000. At higher volumes: DocRaptor Bronze $399/mo (15K docs) vs PDFBolt Growth $79/mo (10K docs).
Tiny free tier
DocRaptor’s free plan includes only 5 production documents per month. Test documents are unlimited but watermarked and cannot be used in production. PDFBolt offers 100 production‑ready PDFs per month with no watermark and no credit card required.
No template system
DocRaptor has no built‑in template management. You manage HTML templates in your own code. PDFBolt provides a Handlebars‑based template system with a visual designer, AI template generation, and a gallery of ready‑to‑use templates.
Prince-specific CSS lock-in
DocRaptor templates often use Prince‑specific CSS properties like -prince‑pdf‑script, prince‑text‑replace, and float: footnote. These do not work in any other engine. Migrating away from DocRaptor means rewriting Prince‑specific CSS.
DocRaptor vs PDFBolt: A Closer Look
How the differences in rendering engine, pricing, and developer experience affect real projects.
Rendering Engine: Prince vs Chromium
DocRaptor
Prince is not a web browser – it reads HTML and CSS and converts them to PDF directly. Because Prince is not a browser, HTML that looks correct in Chrome may render differently in a DocRaptor PDF. This is especially noticeable with modern CSS layouts and JavaScript‑rendered content. Prince also uses its own CSS extensions (such as float: footnote and prince‑text‑replace) that do not work in other engines.
PDFBolt
PDFBolt renders in the same Chromium engine as Google Chrome. What you see in the browser is what you get in the PDF – no rendering surprises. Your existing HTML, CSS, and JavaScript work without modification. There are no vendor‑specific CSS extensions to learn or maintain. Try it in the playground.
Pricing and Value
DocRaptor
DocRaptor’s per‑document cost ranges from $0.12 on the Basic plan to $0.025 on the Silver plan ($1,000/mo). Document hosting is a paid add‑on at 1¢ per document per month, and each download after the first five costs extra. The free tier is limited to 5 production documents – to test without limits you use watermarked test mode, which cannot be used in production.
PDFBolt
PDFBolt’s per‑document cost ranges from under $0.01 on the Basic plan to $0.005 on the Enterprise plan ($249/mo). Generated PDFs are available for 24 hours at no extra cost and can be uploaded directly to your own S3 bucket. The free tier includes 100 production‑ready documents – no watermarks, no credit card, and the same quality as paid plans. See full pricing details.
Developer Experience
DocRaptor
DocRaptor provides official libraries for Ruby, Python, Node.js, PHP, Java, and C#. JavaScript execution is disabled by default. If your HTML uses delayed or asynchronous JavaScript, you define a docraptorJavaScriptFinished() function to signal when rendering is complete. Async document generation supports polling and callback URLs. There is no built‑in template management or visual editor.
PDFBolt
PDFBolt works with any language via REST API. JavaScript is fully supported with waitUntil, waitForSelector, and waitForFunction for precise rendering control. The async endpoint sends HMAC‑SHA256 signed webhooks when documents are ready, including on errors. Templates use Handlebars with a visual designer and AI template generation.
How to Migrate from DocRaptor to PDFBolt
Replace your DocRaptor library with a direct PDFBolt API call in Ruby, Python, Node.js, PHP, Java, or cURL.
DocRaptor gem
require "docraptor"
DocRaptor.configure do |config|
config.username = "YOUR_DOCRAPTOR_API_KEY"
end
docraptor = DocRaptor::DocApi.new
response = docraptor.create_doc(
test: false,
document_type: "pdf",
document_content: "<h1>Invoice #1042</h1><p>Amount: $250.00</p>"
)
File.write("invoice.pdf", response, mode: "wb")
PDFBolt
require 'net/http'
require 'json'
require 'base64'
html = '<h1>Invoice #1042</h1><p>Amount: $250.00</p>'
uri = URI('https://api.pdfbolt.com/v1/direct')
req = Net::HTTP::Post.new(uri)
req['API-KEY'] = 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX'
req['Content-Type'] = 'application/json'
req.body = {
html: Base64.strict_encode64(html)
}.to_json
res = Net::HTTP.start(uri.hostname, uri.port,
use_ssl: true) { |http| http.request(req) }
File.binwrite('invoice.pdf', res.body)
When to Choose DocRaptor
Need CSS Paged Media – footnotes, page floats, and Table of Contents
Need PDF/A archival compliance for regulatory or legal requirements
Need to mix page sizes and orientations within one document
Need Excel export (XLSX) from HTML tables
Need SOC2 or HIPAA compliance certifications
Have print‑centric workflows with existing Prince‑specific CSS
When to Choose PDFBolt
Need CSS Grid and full ES6+ JavaScript – Bootstrap 5, Tailwind, React, and Vue just work
Need lower pricing – per‑document cost from $0.005 vs $0.025
Need production‑ready free tier – 100 docs/mo without watermarks
Need reusable templates with visual designer and AI generation
Need async processing with signed webhooks and direct S3 upload
Need EU‑based, GDPR‑compliant processing with zero source data retention
What Developers Say About PDFBolt
See how teams save time and reduce complexity with our developer‑first PDF solution.
"It has a very intuitive User Interface and easy to use API with a great documentation. What's best, that the support is super fast and even feature requests are discussed and implemented in just a couple of days. It helps us to create individualised PDF gift cards both for digital use as well as print production on the base of modern HTML / CSS."
David Bernhard
CTO at bon-bon.de
"Amazingly, the owner personally helped solve the issues I was having creating an exported lesson plan with hyperlinks and complex styling. This is a great piece of software. But more importantly, it’s the people behind a product that truly make a company great. His willingness to support my project without payment is truly unique – a rare product and a rare individual. This product just works. Thank you, PDFBolt!"
Robert Reich-Storer
Owner of Rhythmstix and Assessify"There's a lot of products that convert to PDF out there, but this one stood out to me, because the output quality is good, it's very easy to use, and pay per use. I also love the interactive API documentation, my request just worked out of the box in my app. And of course the focus on privacy, which is important when working with GDPR data. (...) PDFBolt just works, so I can focus on the business logic."
Malte Bartels
Cloud EngineerFrequently Asked Questions
Common questions about DocRaptor, Prince XML, and switching to PDFBolt.
Does DocRaptor support CSS Grid?
Can DocRaptor run modern JavaScript frameworks?
What is Prince XML and how does it differ from Chromium?
How many free documents does DocRaptor offer?
Does PDFBolt support CSS Paged Media like DocRaptor?
Can I migrate from DocRaptor to PDFBolt?