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Bundle Transformer NuGet version Download count

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Bundle Transformer - a modular extension for the System.Web.Optimization (also known as the Microsoft ASP.NET Web Optimization Framework). StyleTransformer and ScriptTransformer classes, included in the core of Bundle Transformer and implement the IBundleTransform interface. They are intended to replace the standard classes: CssMinify and JsMinify.

The main differences of the StyleTransformer and ScriptTransformer classes from a standard implementations: ability to exclude unnecessary assets when adding assets from a directory, does not produce the re-minification of pre-minified assets, support automatic transformation of relative paths to absolute in CSS code (by using the UrlRewritingCssPostProcessor), etc. These classes do not produce the minification of code in runtime, but this feature can be added by installing of minifier-modules (now available modules based on Microsoft Ajax Minifier, YUI Compressor for .NET, NUglify, Google Closure Compiler, Douglas Crockford's JSMin, Dean Edwards' Packer, Mihai Bazon's UglifyJS, Sergey Kryzhanovsky's CSSO (CSS Optimizer), WebGrease and Clean-css). In addition, you can also install translator-modules, that implement the translation of code on intermediate languages (LESS, Sass, SCSS, CoffeeScript, TypeScript, Mustache (by using Hogan) and Handlebars). Apart from this, in the Bundle Transformer there is a third type of modules - postprocessors. Postprocessors runs after translators and before minifiers. Now available following postprocessors: URL rewriting CSS postprocessor (included in core) and postprocessor-module based on the Andrey Sitnik's Autoprefixer.

This extension will help your web applications successfully pass a most part of the tests in Google PageSpeed.

NuGet Packages





Unofficial modules


Documentation is located on the wiki of this Repo.

Release History

See the changelog.

Old Project Site

Old project site are located on CodePlex.

Who's Using Bundle Transformer

If you use Bundle Transformer in some project, please send me a message so I can include it in this list:



Bundle Transformer was created and is maintained by Andrey Taritsyn.


Bundle Transformer - a modular extension for System.Web.Optimization (also known as the Microsoft ASP.NET Web Optimization Framework).



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