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README.md

heroku-buildpack-wkhtmltopdf

This buildpack downloads and extracts the most recent wkhtmltopdf binaries and works on both cedar-14 and heroku-16 stacks.

Add the Buildpack

Just add the buildpack to your heroku app by executing:

heroku buildpacks:add https://github.com/simplefractal/heroku-buildpack-wkhtmltopdf.git

You can also force this buildpack to be the first Heroku process by using the --index option:

heroku buildpacks:add --index=1 https://github.com/simplefractal/heroku-buildpack-wkhtmltopdf.git

Usage

The binaries wkhtmltopdf and wkhtmltoimage will be available on /app/bin, you can just execute /app/bin/wkhtmltopdf ... from your app.

Why another wkhtmltopdf buildpack

  • None of the available buildpacks (made by the community - there's no official wkhtmltopdf buildpack by Heroku) uses the newest wkhtmltopdf version (and there's a security warning on their website for oldest versions, so it's better to stick with the newest one);
  • Almost all of the available buildpacks downloads wkhtmltopdf from gna.org, but the service is not active anymore and will probably stop serving these files;
  • Some of the buildpacks available set new environment vars instead of just leaving the binary in some location. It increases the boot time since new shell script files needed to be loaded (inside .profile.d/);
  • Most of the available buildpacks works only on cedar-14 stack -- and heroku-16 is the default dyno stack since May 08, 2017.

This buildpack addresses the following issues:

  • Uses wkhtmltopdf version 0.12.4
  • Downloads wkhtmltopdf binaries from wkhtmltopdf.org
  • Do not add new environment variables or shell scripts
  • Tested on both cedar-14 and heroku-16 stack images

Sample app

Want to see this buildpack running? See websitetopdf.