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Uses wkhtmltoimage to create JPGs from HTML

tag: v1.0.1

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Octocat-spinner-32 bin
Octocat-spinner-32 lib
Octocat-spinner-32 spec
Octocat-spinner-32 .document
Octocat-spinner-32 .gitignore
Octocat-spinner-32 .rspec
Octocat-spinner-32 .rvmrc
Octocat-spinner-32 Gemfile
Octocat-spinner-32 Gemfile.lock
Octocat-spinner-32 LICENSE
Octocat-spinner-32 POST_INSTALL
Octocat-spinner-32 Rakefile
Octocat-spinner-32 imgkit.gemspec


Create JPGs using plain old HTML+CSS. Uses wkhtmltoimage on the backend which renders HTML using Webkit.

Heavily based on PDFKit.



gem install imgkit



# takes the HTML and any options for wkhtmltoimage
# run `wkhtmltoimage --extended-help` for a full list of options
kit =, :quality => 50)
kit.stylesheets << '/path/to/css/file'

# Get the image BLOB
img = kit.to_img

# Save the JPG to a file
file = kit.to_file('/path/to/save/file.jpg')

# can optionally accept a URL or a File.
# Stylesheets can not be added when source is provided as a URL of File.
kit ='')
kit ='/path/to/html'))

# Add any kind of option through meta tags'<html><head><meta name="imgkit-quality" content="75")


If you're on Windows or you installed wkhtmltoimage by hand to a location other than /usr/local/bin you will need to tell PDFKit where the binary is. You can configure PDFKit like so:

# config/initializers/imgkit.rb
IMGKit.configure do |config|
  config.wkhtmltoimage = '/path/to/wkhtmltoimage'
  config.default_options = {
    :quality => 60


Mime Types

register a .jpg mime type in:

Mime::Type.register       "image/jpeg", :jpg

Controller Actions

You can then send JPGs with

format.jpg do
  send_data(@kit.to_img, :type => "image/jpeg", :disposition => 'inline')

This allows you to take advantage of rails page caching so you only generate the image when you need to.

Note on Patches/Pull Requests

  • Fork the project.
  • Setup your development environment with: gem install bundler; bundle install
  • Make your feature addition or bug fix.
  • Add tests for it. This is important so I don't break it in a future version unintentionally.
  • Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
  • Send me a pull request. Bonus points for topic branches.


Copyright (c) 2010 Chris Continanza Based on work by Jared Pace
See LICENSE for details.

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