Is my HTML uploaded anywhere?

No. The editor, preview, formatting and export all run locally in your browser. Your code never leaves your device, so it stays completely private and works offline.

Do scripts run in the preview?

No. The preview is rendered in an iframe with the sandbox attribute and the HTML is sanitized first, so any tags or inline event handlers are stripped before display. The preview shows layout and styling safely without executing code.

What does the Format button do?

It runs Prettier's HTML formatter on your code, fixing indentation, normalizing tag nesting, and producing clean, consistent markup with a single click.

What is the email starter template for?

It inserts a table-based, inline-styled responsive email skeleton — the layout pattern that renders consistently across email clients like Gmail, Outlook and Apple Mail, including a bulletproof call-to-action button you can edit.

Yes. Use Copy to put the HTML on your clipboard, or Download .html to save it as a file you can open or upload anywhere.

HTML Editor

WEB

Write and edit HTML in your browser with syntax highlighting and an instant, sandboxed live preview — free and offline-friendly.

What it does

Carbide's HTML Editor is a free, in-browser code editor for writing and previewing HTML the moment you type. The left pane gives you a real code editor with syntax highlighting and line numbers; the right pane renders a live preview inside a sandboxed iframe, so your markup updates instantly without ever running scripts. One click reformats messy markup with Prettier so your indentation and tag nesting are clean and consistent. Need an email layout? Drop in the table-based, inline-styled responsive starter template that renders reliably across Gmail, Outlook and Apple Mail. When you're done, copy the HTML or download it as a ready-to-use .html file. Everything happens entirely on your device — your code is never uploaded to a server, which makes it private, fast, and usable even when you're offline. Whether you're prototyping a page, drafting a newsletter, or just learning HTML, it's a clean, no-setup workspace that works on phone and desktop alike.

How to use the HTML Editor

Type or paste your HTML into the source pane
Watch the sandboxed preview update live
Click Format to clean up the markup
Insert the email starter template if you need one
Copy the HTML or download it as an .html file

Frequently asked questions

Is my HTML uploaded anywhere?: No. The editor, preview, formatting and export all run locally in your browser. Your code never leaves your device, so it stays completely private and works offline.
Do scripts run in the preview?: No. The preview is rendered in an iframe with the sandbox attribute and the HTML is sanitized first, so any <script> tags or inline event handlers are stripped before display. The preview shows layout and styling safely without executing code.
What does the Format button do?: It runs Prettier's HTML formatter on your code, fixing indentation, normalizing tag nesting, and producing clean, consistent markup with a single click.
What is the email starter template for?: It inserts a table-based, inline-styled responsive email skeleton — the layout pattern that renders consistently across email clients like Gmail, Outlook and Apple Mail, including a bulletproof call-to-action button you can edit.
Can I save my work?: Yes. Use Copy to put the HTML on your clipboard, or Download .html to save it as a file you can open or upload anywhere.

Take Carbide everywhere

All 121 tools, offline, on iOS & Android — free.