Validate your web.config for invalid configuration using the only web.config validator available. Did we forget to tell you that it is completely free?Web.config Validator
Using the .NET stack trace formatter, you can pretty-print any stack trace and either copy and paste it or download a screenshot for your blog post.Stack Trace Formatter
Test your XDT transformation files against the original Web.config file. The only online tool that shows you the diff directly in your browser.Web.config Transformation Tester
Spotting why config in appsettings.json files doesn't work can be hard. Use our free validator to check both the syntax and content of your config files.Appsettings.json Validator
Convert a multiline text to a verbatim C# string online. Remove tedious work making a text look good in your IDE with this free tool.Multiline String Converter
Validate and format any JSON file using this free tool. JSON is formatted client-side to avoid sharing your JSON with anyone.JSON Formatter
If you need help writing environment specific appsettings.json files, our Appsettings.json Transformation Tester is a good start.Appsettings.json Transformation Tester
Convert any image file to a Base64 encoded string in the browser. Copy and paste the generated string to HTML or CSS using this simple service.Base64 Image Encoder
A free tool to create an MD5 hash from any string. Copy and paste the hash to your own code or use one of our samples to generate MD5 strings in your code.MD5 Encoder
Use the free GUID generator to produce one or more GUIDs. With example code in C#, you will get ready-to-copy and paste code for your tests or similar.GUID Generator
The most advanced XML formatter and validator. Free pretty-print of any XML file with a range of options to control spaces, tabs, and more.XML Formatter
Quickly format C# code online. With support for configuring the number of spaces, removing empty lines, tabs vs spaces, we've got you covered.C# Formatter
A free viewer for World Wide Web Consortium (W3C) Extended Log File Format files. Upload log files from IIS and more to get an overview of log data.W3C Extended Log File Format Viewer
Writing cron expressions/descriptors that parse can be a nightmare. Use our free generator and evaluator to repeat tasks every day, hour, minute, etc.Cron Expression Parser
Sometimes you just need a bit of online help solving recurring tasks. We constantly find ourselves googling terms like "validate web.config" or "format stack trace". While most features are built into modern IDEs like Visual Studio and Code, having online tools solve small dedicated problems is a life-saver. With elmah.io's growing list of free online tools, we want to help you by providing a range of tools solving problems specifically for .NET/C# developers.
If you have an idea for a new tool, don't hesitate to reach out. We are always looking for tools to build that will help our users.