Install the app and run it. This will register the availability of the app’s QuickLook extensions, Previewer and Thumbnailer. You can now quit the app: just click OK:
Using QuickLook in Finder — select a Markdown file (
.markdown, for example) and press space — will pop up a rendered image of file:
You can disable or re-enable Previewer and Thumbnailer in System Preferences > Extensions:
For some background information on how Catalina delivers QuickLook previews, please see this blog post.
Version 1.2.0 adds a Preferences panel, which allows you to adjust some of the key elements of the preview:
Changing these settings will affect previews immediately, but may not affect thumbnail until you open a folder that has not been previously opened in the current login session.
You can use the in-app UI to submit feedback or contact me. Just click in the Send Feedback button in the main window, or select Report a Bug… from the Help menu:
If it appears that either Previewer or Thumbnailer are not working after you have run the host app, please log out of your Mac and then log back in. A future release will offer to do this for you.
Some applications which can edit Markdown files may register a non-standard, proprietary Uniform Type Identifier (UTI) for Markdown files. PreviewMarkdown may not be aware of these UTIs and therefore may not be able to preview and thumbnail these files on your system. If you encounter this issue — typically, previews of markdown files will show the raw formatting text — please run utitool to see your system’s registered Markdown file UTI. This UTI will automatically be included in any message you send using PreviewMarkdown’s feedback facility.
If you have found PreviewMarkdown to be useful, please consider writing a positive review on the Mac App Store, or simply give it a rating.
In addition to its own code, PreviewMarkdown makes use of code from the following sources:
string index out of rangein SwiftyMarkdown).
You can view PreviewMarkdown’s source code at GitHub.