Generating PDF document from HTML in Ruby

Wondering how to convert HTML to PDF in Ruby? wkhtmltopdf is a popular open source HTML to PDF conversion library. Wicked PDF is a Ruby wrapper for the command line wkhtmltopdf.

While wkhtmltopdf is a good open source and free option for converting HTML to PDF, headless Chrome is the best way to convert raw HTML and CSS to PDF. Nothing can render HTML better than a browser and nothing beats Chrome when it comes to rendering HTML. Chrome has inbuilt capability to convert any HTML page to PDF. Another benefit of generating PDF documents from HTML is that you can style the document using your familiar CSS framework. You don't have to learn a new styling language to get the out put you want. You can focus on creating the data for the PDF you want and leave the rest to our API.

We at PDFMark have done the hard work of managing the headless Chrome and wrapped it into an easy to use REST API so you can simply call the API from your Ruby on Rails application and pass in the HTML or a URL and get it converted to a PDF document. PDFMark will even upload it to cloud and give you a CDN link so you can simply serve that link to your end users without having to worry about saving the document yourself.

Here is the code for calling the PDFMark HTML to PDF REST API in Ruby
require "uri"
require "json"
require "net/http"

url = URI("")

https =, url.port)
https.use_ssl = true

request =
request["key"] = "YOUR_API_KEY"
request["Content-Type"] = "application/json"
request.body = JSON.dump({
  "html": "HTML_TO_CONVERT",
  "margin": "1in"

response = https.request(request)
puts response.read_body

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