Markdown Editor Online is a free and versatile Chrome add-on that allows users to easily edit and compile Markdown files. With its built-in markdown editor, users can modify the code of any MD file and view the final document in the app. The app provides a user-friendly interface with the code editor on the left side and the compiled document on the side or bottom section, depending on the window size.

One of the standout features of Markdown Editor Online is its ability to compile the code on-the-fly as users type in the editor. This allows for a seamless editing experience and instant feedback on the changes made. Additionally, the app offers a few options in the top toolbar to customize the editing environment according to user preferences.

Another useful feature of Markdown Editor Online is the ability to save the final markdown code or generate a PDF of the completed work. Users can simply click on the "Print" button to access the print UI and convert their markdown document into a PDF file.

It is worth mentioning that Markdown Editor Online is based on the open-source JavaScript libraries CodeMirror and markdown-it, ensuring reliability and compatibility with various markdown syntaxes.

Overall, Markdown Editor Online is a lightweight and adaptable tool for Chrome users who work with Markdown files. Its intuitive interface and convenient features make it a valuable addition to any developer or writer's toolkit.