What is HTML Viewer?
This utility acts as a structural inspector that parses raw HyperText Markup Language and converts it into an interactive, collapsible Document Object Model (DOM) tree. Rather than struggling to read dense, unformatted code strings, developers can use this interface to visualize the exact hierarchy of their tags, attributes, and text nodes.
As you paste your source code, the engine instantly maps out every element, from the root node down to deeply nested children. It color-codes tags (like <div> or <span>) and attributes (like class or href) while providing interactive toggles to expand or collapse specific branches. Additionally, it offers a direct execution feature that converts your code into a Blob URL, allowing you to launch and view the fully rendered webpage in a new tab.
Why use our free HTML Viewer?
Navigating large blocks of markup without syntax highlighting or structural folding is highly error-prone. Analyzing your code through a dedicated tree explorer provides distinct technical advantages:
- Isolate Unclosed Tags: By collapsing parent branches (like tables or complex flexbox containers), you can immediately spot structural imbalances, unclosed elements, or orphaned tags that would break your layout.
- Understand Scraped Data: When extracting raw data from APIs or web scraping, dropping the dense string into the viewer instantly reveals the underlying DOM structure, making it easier to target specific classes or IDs.
- Safe Local Execution: All parsing happens entirely inside your browser's memory. You can visually inspect proprietary templates or execute the code in a new tab without any data touching external servers.
How to use the HTML Viewer
- 1 Input your code: Paste your raw, minified, or disorganized source string directly into the primary editor on the left.
- 2 Explore the tree: Look at the right-hand panel to see the generated DOM structure. Click the small arrows next to parent elements to collapse or expand their children.
- 3 Toggle everything: Use the "Collapse All" or "Expand All" buttons to instantly manage the visibility of deeply nested documents.
- 4 Launch a preview: Click the "Run" button to open a new browser tab that renders the visual webpage exactly as it would appear in production.
Frequently Asked Questions
No, you can inspect your code locally without any strict restrictions. The parsing engine relies on your device's memory to generate the DOM tree, so extremely massive files may take a few seconds to map out depending on your hardware.
The right-hand panel visualizes the structural nodes (tags and text) rather than rendering visual assets. If you want to see how images, colors, and layouts actually look, click the "Run" button to execute the code visually in a new tab.
No, it operates as a strict parser, meaning it displays exactly what you paste. If there is a severe syntax error that prevents DOM generation, an error banner will notify you so you can manually correct the markup.
Yes. The tree will display `<style>` and `<script>` blocks just like any other node, allowing you to fold them away to focus on the core layout. When you use the "Run" feature, those scripts and styles will execute natively in the new tab.
You can simply paste the entire document into the editor. The parser is built using a template wrapper that accurately maps root-level tags, meta elements, and document declarations without stripping them out or breaking the hierarchy.