Greenroom. — edit HTML presentations in your browser, like PowerPoint
drag in an html deck · it never leaves your browser
drop deck here
or click to browse
no deck handy? open the demo deck →
drag in an html deck · it never leaves your browser
no deck handy? open the demo deck →
about
More and more slide decks are single HTML files — built by hand, exported by tools, or generated by AI assistants like ChatGPT and Claude. They look great and open in any browser, but there has never been a way to edit one without digging through code. Greenroom is that missing editor: open an HTML deck and change it the way you would in PowerPoint, then save the same single file, still working everywhere.
.html presentation on this page (or try the demo deck)Yes — free, no account, no signup. Open the page and start editing.
No. Your deck is opened, edited, and saved entirely in your browser. Nothing is transmitted to a server — you can verify this in your browser's network tab.
Yes — that's exactly what Greenroom is built for. AI assistants often produce decks as single HTML files; open one here and fix text, numbers, or layout without re-prompting. See our guide to editing AI-made decks.
Static HTML presentations (including AI-generated ones) edit fully. Decks that render themselves with a JavaScript framework at runtime get a more limited "basic mode" — the editor tells you rather than risking your file.
Yes — the pdf button opens a print-ready view scaled to A4, one slide per page. See the PDF guide.
Yes — ▶ present opens a full-screen slideshow with keyboard navigation. More in the presenting guide.
More: how to edit an HTML presentation · HTML presentations, explained · PowerPoint vs HTML decks