Codepen

Codepen HTML editor is another online HTML editor which is widely used by programmers for writing and edit HTML. Like most of the HTML editors online, Codepen can be used for HTML, CSS, and JS editing. Codepen comes with a lot of features.

As mentioned before, Codepen supports HTML, CSS, and JS which is why [you can upload files like an image, pdf, CSS, JS, or even a short movie file. Codepen provides automatic pre-processing and file uploading features that can easily be deployed to the website.

One of the standout features of this online HTML editor is you can see the output of your code on multiple devices and computers.

Not only this, but you can share code and real-time output with students and group chat using Professor mode in Codepen.