Over the years, I’ve received several requests to extend Fiddler to support viewing PDF files directly within the debugger. PDF is a complicated binary format and it doesn’t work well with any of Fiddler’s default Inspectors, which are best suited to inspect web pages, images, and data formats like XML and JSON.

Fortunately, Fiddler’s powerful extension model permits developers to easily extend the tool to handle any data format, and I recently discovered that Telerik’s RadControls for WinForms library includes a PDF-rendering component. The library enabled me to build a PDF document viewing Inspector in just 80 lines of code, and it doesn’t require the user have any third-party PDF-viewer applications installed.

The new PDFView Inspector for Fiddler ( download here ) enables you to view PDF files directly within Fiddler’s Inspectors tab, whether you’re viewing a simple document:


…or a richly-formatted eBook:


The RadPdfViewer control supports all the features users expect, so you can search and print the document, copy/paste from it, zoom in/out, et cetera, all without requiring a single line of code on my part. If you’re interested, you can watch a quick-start video about the control here .

I hope you’ll find PDFView useful. If you have any questions about this new Inspector or the Telerik RadControls, please let me know!


-Eric Lawrence

About the Author

Eric Lawrence

(@ericlaw) has built websites and web client software since the mid-1990s. After over a decade of working on the web for Microsoft, Eric joined Telerik in October 2012 to enhance the Fiddler Web Debugger on a full-time basis. With his recent move to Austin, Texas, Eric has now lived in the American South, North, West, and East.

Related Posts


Comments are disabled in preview mode.