HTML Editor
Edit HTML with a live preview and one-click formatting. It runs entirely on your device — nothing is uploaded.
Example
Edit the markup and watch the live preview update; hit Format to clean it up.
How it works
Type HTML on the left and see it rendered live on the right; click Format to tidy the source with Prettier.
Good to know
The HTML Editor is a split-pane scratchpad for writing markup and seeing it render instantly. You type or paste HTML into the source panel on the left, and the right panel shows the rendered result as you go, so you never have to save a file and refresh a browser tab to check your work. It is aimed at front-end developers, students learning markup, and anyone who needs to quickly mock up or troubleshoot a snippet without spinning up a project.
Reach for it when you want a fast, throwaway environment: testing how a table, form, or list of elements behaves, sanity-checking a chunk of HTML someone sent you, or experimenting with structure before pasting it into a real codebase. Because everything runs locally in the browser, it is also a sensible choice for handling markup from internal or client work that you would rather not paste into a cloud service.
Read the output simply as what a browser would draw from your source. If the preview looks wrong, the markup is usually the cause: an unclosed tag, a stray angle bracket, or mismatched nesting will visibly shift or break the layout, which makes the live view a quick visual debugger. The Format button runs Prettier over your source to re-indent and normalize it, so the structure becomes easy to scan after you have been editing fast.
A practical caveat: this is an editor with a rendered preview, not a validator or a sandboxed runtime. It will happily render malformed or incomplete HTML the way browsers do, silently correcting some mistakes, so a preview that looks fine is not proof the markup is valid or complete. If you need strict checking, pair it with an HTML validator, and remember that external CSS, fonts, or scripts your snippet references will only appear if those resources are reachable.
Frequently asked questions
Is my data uploaded anywhere?
No — everything runs in your browser. Your code never leaves your device, so it's safe for private work and runs offline once loaded.
Is this tool free?
Yes, completely free with no sign-up and no limits.
People also ask
Does the HTML editor render external CSS and JavaScript?
It renders inline styles and markup directly, and it can pull in external CSS, fonts, or scripts only if your snippet links to a reachable URL. Resources behind a login or on your local machine will not load in the preview.
Can I edit a full HTML document or just a fragment?
You can do either. Paste a complete document with its doctype, head, and body, or drop in a single fragment like a div or table; the browser renders whatever markup you provide.
What does the Format button actually do to my code?
It runs Prettier over your source to re-indent it, normalize spacing, and lay out nested elements consistently. It reformats appearance only and does not change what the markup renders.
Will this editor fix or validate broken HTML?
No. It renders markup the way a browser does, which means it may silently tolerate or auto-correct some errors, but it does not flag invalid or unclosed tags. Use a dedicated HTML validator if you need strict error checking.
Can I use the HTML editor offline?
Once the page and its scripts have loaded in your browser, the core editing and preview work without a network connection. Formatting relies on a library loaded with the page, and any external resources your HTML references still need internet access.
How do I save the HTML I write in the editor?
The tool is a live scratchpad, so copy your source out of the editor panel and paste it into a file on your computer to keep it. Closing or reloading the page does not guarantee your content is retained.
Is an online HTML editor safe for confidential or client code?
This editor runs entirely in your browser and does not upload your markup to a server, which reduces exposure compared with tools that process code in the cloud. As with any web tool, confirm the page is the source you trust before pasting sensitive content.
What is the difference between an HTML editor and an HTML formatter?
An editor lets you write and modify markup while showing a live rendered preview, whereas a formatter focuses on reindenting and tidying existing source. This tool combines both, since it includes a one-click format step alongside the live preview.
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