HTMLViewer is a free, browser-only tool that renders your HTML instantly as you type, paste, drop, or open it. The preview updates automatically, with no uploads, publishing steps, or account required. Everything runs locally, so your code is never transmitted or stored—ideal for client work, email templates, or unreleased pages. You can format messy markup, load a sample, and export your result. When you're ready to go live, Tiiny Host publishes it to a shareable URL in seconds.