F# – PDF fun with Markdown and FSharp.Formatting

Check out my new course Learn you some Lambda best practice for great good! and learn the best practices for performance, cost, security, resilience, observability and scalability.

I spent the last couple of nights putting together a simple Markdown to PDF formatter using Tomas Petricek’s FSharp.Formatting project and the PdfSharp-MigraDoc library.

To use this library, you can either grab the source from the GitHub repository or get it from Nuget using the following command:

NuGet package

F# Usage

To use the library from F#, you can use the Markdown type defined in the FSharp.Markdown namespace (from the FSharp.Formating library), once you’ve opened the FSharp.Markdown.Pdf namespace you’ll have access to two static extension methods:

  • TransformPdf – accepts a string as input and outputs the resulting PDF to a local file path or to a specified Stream.
  • WritePdf – accepts a MarkdownDocument generated by the Markdown.Parse method, and outputs the resulting PDF to a local file path or to a specified Stream.

C# Usage

You can also use this library from C#, however, the static extension methods mentioned above is not accessible in C# because type extensions defined in F# are compiled differently to standard extension methods you find in C# (with far more possibilities I might add, such as extension properties, and static methods, for instance!) and is not recognized by the C# compiler..

You can still access the same functionalities using a MarkdownPdf type, with two static methods:

  • Transform – equivalent to Markdown.TransformPdf.
  • Write – equivalent to Markdown.WritePdf.

You can see an example output here with the corresponding Markdown here.

Liked this article? Support me on Patreon and get direct help from me via a private Slack channel or 1-2-1 mentoring.
Subscribe to my newsletter


Hi, I’m Yan. I’m an AWS Serverless Hero and the author of Production-Ready Serverless.

I specialise in rapidly transitioning teams to serverless and building production-ready services on AWS.

Are you struggling with serverless or need guidance on best practices? Do you want someone to review your architecture and help you avoid costly mistakes down the line? Whatever the case, I’m here to help.

Hire me.


Check out my new course, Learn you some Lambda best practice for great good! In this course, you will learn best practices for working with AWS Lambda in terms of performance, cost, security, scalability, resilience and observability. Enrol now and enjoy a special preorder price of £9.99 (~$13).

Start Learning


Are you working with Serverless and looking for expert training to level-up your skills? Or are you looking for a solid foundation to start from? Look no further, register for my Production-Ready Serverless workshop to learn how to build production-grade Serverless applications!

Find a workshop near you