Render KaTeX in newsletters

Using Ghost
1

Hello,

I’m using KaTeX formulas in my blog posts, but they aren’t rendered properly when sent via email, as this requires JavaScript execution. The formulas just appear as plain text, like \(\sqrt{N}\).

Do you have a solution for rendering these kinds of formulas in email newsletters?

I’ve already checked the forum, and the only topic mentioning this issue didn’t receive a response: LaTex or KaTeX in Newsletter.
I also understand that converting all formulas to images is an option, but this isn’t ideal when there are many formulas.

Thanks in advance for your help!

2

Welcome to the forum @jstts :waving_hand:

Would it work to send the email with a screenshot image of the KaTeX and a link to the post?

Then swap this out for the JS on the post.

You could use the new content visibility feature quite cutely here.

  1. Add your KaTeX via a HTML card, and set visibility to be off for email
  2. Add a screenshot of the KaTeX in a call to action card, with a link to the post. Set visibility off for the web

CleanShot 2025-04-10 at 12.28.27@2x
CleanShot 2025-04-10 at 12.28.27@2x2154×720 105 KB

3

Hi @jonhickman, thanks for your answer!

I’m not sure I fully understand your suggestion. What would be the purpose of having a screenshot of the KaTeX that redirects the user to the blog article on click? If the solution is sending a short email to redirect the user to the blog article, why bother doing a clickable screenshot of a KaTeX formula?

Also I would be interested in a solution that allows to display the full article in the email, including the LaTeX formulas. I’ve already tried to send newsletters with a call to action only but it’s losing a lot of traction.

4

You won’t get your KaTeX in the email, as you’ve said.

An image is a good way of representing it, but doesn’t help people to actually read or copy the content.

Giving them an image and a path back to the post is a good middle ground I would have thought (sorry if that’s not the case)

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