Built by
Axel.
HTML Viewer Cat is a one-person project. I build it because I use it — paste-and-render tools that don't ask for an account, don't upload your code, and don't bury the thing you came for under a marketing site.
I'm a developer working out of Norway. I started HTML Viewer Cat in early 2026 after losing patience with the existing crop of HTML preview tools — most of them either gate the basic feature behind a signup, ship a telemetry SDK that watches what you paste, or wrap the editor in three layers of marketing copy. None of that helps when you're trying to debug a snippet of HTML at 2am.
The site is intentionally small. Four tools — an HTML viewer, a markdown editor, an HTML-to-PDF exporter, and a JSON viewer — each doing one thing in the browser, with a shared split-pane and shared keyboard shortcuts so switching between them is zero-friction. No sprint planning; I add a tool when I catch myself reaching for one and not finding it.
The site has no backend. Drafts are saved to your browser's localStorage. Share links base64-encode your HTML into the URL fragment so the link itself carries the content — nothing touches my server. Analytics is Plausible, cookieless and aggregate. Read more on the why page, or check the changelog to see what's shipped recently.