Markdown Here is a browser extension designed for users who prefer composing emails in Markdown format, allowing them to convert plain text into visually appealing HTML before sending. This tool is ideal for programmers and mathematicians, as it supports syntax highlighting and TeX formula rendering. Compatible with popular email clients like Gmail and Thunderbird, it simplifies the email creation process, enabling users to focus on content instead of formatting intricacies.

The extension operates seamlessly within the email client's rich editor. Users can easily toggle between Markdown and rendered HTML with a simple right-click. Markdown Here also integrates well with other platforms such as Google Groups, Evernote, and WordPress. As an open-source project, it prioritizes user privacy by ensuring that data modifications occur locally within the browser without external data requests.