If you've ever pasted a Markdown doc full of LaTeX equations and Mermaid diagrams into a converter and gotten back a mess — broken formulas, missing charts, raw code where a diagram should be — you've hit the dirty secret of most "Markdown to anything" tools: they handle text fine and quietly give up on the hard parts.

I kept running into this, so I built a converter that treats math and diagrams as first-class citizens instead of afterthoughts. Here's why it's harder than it looks, and what it takes to get right.

Text is easy. Math and diagrams are not.

Converting Markdown headings, lists, and bold text to Word or PDF is close to a solved problem. The trouble starts with LaTeX equations and Mermaid.js diagrams. These aren't text — they're tiny languages that have to be parsed and rendered, not just copied. Most converters either strip them, dump the raw source, or paste in a blurry screenshot. None of those is acceptable if your document is actually about the math.

What "doing it right" actually means

For equations, it means rendering real LaTeX and carrying it through to the output faithfully — including the export to Word, where math has to become native, editable equations, not images. For Mermaid, it means actually running the diagram engine and embedding a clean rendered chart. The pipeline is fiddly: a tiny detail like over-aggressively "cleaning" a LaTeX command can silently break spacing or drop a symbol, and you won't notice until a user's formula looks wrong.

Why it's worth the trouble

Because the people who write Markdown heavy with math and diagrams — researchers, engineers, technical writers, students — are exactly the people every generic converter fails. Serving the hard case well is a moat. It's the difference between "yet another converter" and the one a specific audience tells their colleagues about.

The broader lesson: when a whole category does the easy 80% and punts on the 20% that's actually hard, that 20% is your opening. If you live in Markdown and need math and diagrams to survive the trip to Word, PDF, or HTML, this is the tool I built for it: markdownconverter.pro.

Anyone else deliberately chasing the "hard 20%" the rest of a category ignores? Curious what moats that has opened for you.