Simple clippings app

[25ThirtySix]

HI! I do all my writing in Markdown (CommonMark and GitHub Markdown). Most of the apps I use don't support non-standard formatting but do support the HTML equivalents.

So, I am looking for an app that can take selected text (from the Clipboard) and add HTML syntax around the selected text. And then allow the marked-up text to be pasted back (from the Clipboard).

For example:

<mark>Selected text</mark> for highlighted text

<u>Selected text</u> for underlined text

<center>
Block of selected text
</center> for centered text

Something accessible from the toolbar that keeps the number of keystroke to the absolute minimum would be nice.

Regards
Peter