How can I test my markdown without committing first?

Hi, we use and love the integrated markdown features of gitlab. We’ve gone so far as writing all of our support documentation in markdown, committing it with git and providing public URLs from gitlab to any interested parties. Bye, bye, MS Word.

We find it very helpful to keep a decent markdown previewer going as we write. There’s a nice plugin for Eclipse called GFM Viewer. It calls github with our markdown and displays it in a semi-live preview. Not all Markdown is created equal though–the markup from Github is different than gitlab. We would really like to switch that API URL to one provided by our gitlab instance for two reasons. One, the markup in the preview is exactly what it would look like after checked in, and two, all of our company secrets wouldn’t be leaked out to github.

Any ideas?