Equations in Blogger

Blogger has no plugin system, but it does let you add a script to every page of your blog. Add fxTeX there once, and any LaTeX you write in a post between $…$ or $$…$$ is shown as a properly typeset equation — free, with no licence key.

To add it:

1. Log in to Blogger: https://www.blogger.com
2. Choose Layout from the dropdown menu under More Options:

   

3. In Manage Blogs, select Design:

   

4. On the right, click Add a Gadget:

   

5. Scroll down and select HTML/JavaScript:

   

6. Switch to Edit HTML mode. The Rich Text link in the upper-right corner indicates that you are editing HTML. Paste the following code into Content:
   

   <script src="https://fxtex.codecogs.com/fxtex.min.js"></script>
   <script>fxTeX.autoRender();</script>Copy

7. Select Save and close the gadget editor.

Then write equations straight into your posts, for example $e^{i\pi}+1=0$. Readers can right-click any equation to copy it or open it as a graph — see the right-click menu. To write equations with a toolbar rather than by hand, compose them in the online fxEditor and copy the LaTeX across.