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HTML Viewer

Open an HTML file or paste your code to see a live, rendered preview alongside the source. Switch between desktop, tablet and mobile widths, edit on the fly, then copy or download — all privately in your browser.

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What is the HTML Viewer?

The HTML Viewer is a free online tool that lets you open any HTML file — or paste raw HTML code — and instantly see how it renders in a real browser. It shows a live, fully-rendered preview next to the editable source code, so you can inspect a page's structure, styling and behaviour without setting up a local server or installing an editor. Because everything runs inside your browser, your files never leave your device.

Live Preview, Source Code & Split View

Switch between three layouts at any time. Preview mode shows only the rendered page, Code mode shows only the editable source, and Split mode shows both side by side. Edits you make to the source update the preview instantly, turning the viewer into a lightweight scratchpad for tweaking markup, testing a CSS change, or checking how an email template or snippet looks before you ship it.

Responsive Device Widths & Fullscreen

Preview your page at desktop, tablet or mobile widths with a single click to check responsive behaviour and breakpoints. The dedicated fullscreen mode hides everything else so you can focus on the rendered output, which is ideal for demoing a layout, reviewing a landing page, or inspecting a complex component on a smaller screen.

Copy, Download, Open & Print

When you are happy with the result you can copy the HTML to your clipboard, download it as a .html file, open the rendered page in a new browser tab, or send it straight to your printer. These export options make the viewer useful for sharing a quick mockup, saving a cleaned-up snippet, or producing a print-ready version of a document.

Privacy: Everything Stays on Your Device

Unlike online services that upload your files to a remote server, this HTML Viewer renders everything locally using a sandboxed preview frame. Your markup is never transmitted, stored or logged anywhere, which makes it safe to preview confidential templates, internal documents and work-in-progress pages. Close the tab and the content is gone.

Who Uses the HTML Viewer?

  • Developers — quickly preview a snippet, email template, or exported page without spinning up a dev server.
  • Designers — check how markup renders at different screen widths before handing off.
  • Students — learn HTML and CSS by editing code and watching the result update live.
  • Writers & marketers — preview HTML newsletters, landing pages and embeds before publishing.
  • Support teams — open a customer-supplied HTML file safely to see what it contains.
Free HTML Viewer Online - Preview HTML Files | ToolSnak

Got Questions? We have you covered

No. The HTML Viewer works entirely in your browser. Your file is read locally and rendered in a sandboxed frame, so it is never uploaded, stored or sent anywhere. This makes it safe for confidential and internal files.

Yes. The preview renders inline and embedded CSS and runs JavaScript inside a sandboxed frame, so you see the page much as a normal browser would display it. External resources referenced by absolute URLs will load if your network allows it.

Absolutely. In Code or Split view the source is fully editable, and the preview updates as you type. It's a fast way to tweak markup, test a style change, or fix a small issue without any setup.

You can open .html and .htm files, or simply paste raw HTML using the Paste Code tab. The viewer also handles HTML fragments and full documents alike.

Yes. You can copy the HTML to your clipboard, download it as a .html file, open the rendered page in a new tab, or print it directly from the toolbar.

Yes. The viewer is fully responsive and works in any modern browser on phones, tablets and desktops. You can also preview your page at different device widths to check responsive layouts.