An experimental hackety hack to export HTML from LaTeX on Overleaf, using make4ht:
Math is exported as MathML and will be rendered using MathJax;
EPS and PDF graphics are converted to PNG;
JPG and PNG graphics are used as-is;
TikZ drawings are exported as SVG.
This is provided 'as is' and is not officially supported by Overleaf.
In this sample set-up, the HTML export will only be triggered if the project is set to compile with pdfLaTeX. It'll take longer than usual to compile your project; so probably a good idea to only add the latexmkrc file that triggers the HTML export when you're quite down with writing.
You can download the generated files using the steps described here.
make4ht does not work well with authblk, fontspec and possibly other packages. This is an experimental hackety hack!
A very experimental hackety hack to export ePubs from LaTeX on Overleaf, using tex4ebook. After creating a new project from this template and when compilaton has completed, download the generated .epub file using the steps described here. This is provided 'as is' and is not officially supported by Overleaf.
In this sample set-up, the .epub export will only be triggered if the project is set to compile with pdfLaTeX and will likely fail with many packages; this is a very basic example and this is a hackety-hack.
See the tex4ebook Github repository for documentation and discussion; though bear in mind that . Overleaf does not necessary have the most up-to-date tex4ebook release.