Wt – C++ Web Toolkit

Why choose Wt?

You don't want to focus on details like request handling or page rendering. You want your application to continue to work even when JavaScript is unavailable. You just want to write your web application in C++ without sacrificing interactivity. Wt allows you to focus on functionality and create highly interactive, secure, and future proof applications quickly.

Save Time

Wt handles all the nitty-gritty of requests and responses and client-side JavaScript, and allows you to focus on functionality in pure C++.

Built to Maintain

Wt's widget abstraction represents HTML elements as C++ objects, allowing them to be easily composable and extendable.

Future Proof

Stay up to date with the latest web technologies without changing your code, thanks to Wt's stable API.


Wt is designed to be resilient against the most common types of exploits: SQL injection, XSS and CSRF vulnerabilities.

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Wt has a lot to offer. It includes the essential basic widgets and building blocks to build web applications, but also offers built-in security, PDF rendering, a 2D and 3D painting system, an object-relational mapping library, a charting library, and an authentication framework. You can see the full list of features here , but here's a short overview:

Widget library

Many widgets are included in Wt. For every HTML element there's a corresponding widget. These widgets can emit signals when interacted with, so you can write web applications like desktop applications. Check out the widget gallery for an overview of the widgets that Wt has to offer.

Server side, client optimized

Wt employs a signal-slot system. Instead of worrying about the sending of Ajax requests and serving of pages, you can simply connect the click of a button to a callback function on the server. Take a look at this example in the widget gallery. Wt will use whatever technology available for communication: Ajax or WebSockets, but will fall back on full HTML page loads when JavaScript is unavailable. This makes Wt applications accessible to any browser or web crawler.

Built-in security

Wt automatically protects against misuse by only allowing visible and enabled widgets to be interacted with. This also helps to avoid CSRF attacks, which are doubly avoided because Wt does not store session information in cookies. By using the widget abstraction, Wt discourages the inserting of raw HTML into a web page, preventing XSS attacks. Wt::Dbo prevents SQL injection by encouraging the use of prepared statements when accessing the database. Wt also includes an authentication and registration system with support for OAuth providers like Google, Facebook, and OpenID Connect.

PDF rendering

Create PDFs and render HTML as PDF with Wt's PDF rendering system. Check out PDF rendering in the widget gallery.

2D and 3D painting system

Use a single 2D drawing API with many backends (PNG, JPEG, SVG, HTML canvas, VML, and PDF) so you only need to write your drawing code once to support any web browser and save to many formats. Write server-side (OpenGL) and client-side (WebGL) 3D graphics with a uniform API. Wt's 2D and 3D charting libraries were built on top of this graphics API. Check out the examples in the widget gallery.

Object relational mapping library

Map classes in C++ to tables in your database with Wt::Dbo, an ORM that only requires pure C++, and does not rely on preprocessor magic or code generation. Get a taste for Wt::Dbo with the introductory tutorial.

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Latest News

Wt 3.6.1 & 4.3.1

  • Posted by Roel
  • 20 April 2020

Wt 4.3.0 was released almost a month ago, so it’s about time for a patch release. Wt 4.3.1 (and Wt 3.6.1) is a tiny patch release, with the most notable fix being an issue in the destructor of WWebWidget when user-defined ids were used. There will be no JWt 4.3.1 since nothing has changed to JWt.

Read the release notes for more information.

Here are the links:

Binary builds for Windows are available on the GitHub releases page .

Some users of (J)Wt