I built a free editor for HTML slide decks from Claude — edit them like PowerPoint, right in your browser, no sign-up, data stays in your browser

Lately a lot of my presentations come out of Claude/ChatGPT as a single HTML file. They look great and open anywhere, but the moment you need to fix a typo or move a box before a meeting, you're stuck re-prompting the AI or digging through dev tools.

So I built Greenroom: drop in an HTML deck, click any text to edit it, drag and resize elements (with snapping guides), edit chart data, reorder slides, change the deck's colors, present fullscreen, export PDF. Hit save and you get back the same single HTML file, still working everywhere.

No signup, no upload, the file never leaves your browser (check the network tab if you don't believe me).

Try it: edit-html.com There's a built-in demo deck if you don't have one handy.

It's early I'd genuinely love to know what breaks when you throw your own decks at it.