HTML Parser
Paste HTML and explore the DOM tree, test CSS selectors, and see matched elements highlighted live.
Paste HTML and explore the DOM tree, test CSS selectors, and see matched elements highlighted live.
This free HTML Parser from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the HTML Parser
- Paste your input - JSON, regex pattern, JWT, URL etc.
- Pick any flags or options the tool supports.
- Click the action button (Format, Test, Decode).
- Copy the result or download it as a file.
What you can do with the HTML Parser
- Format and validate API responses while debugging.
- Test regex patterns against real input before deploying.
- Decode JWTs to inspect claims and expiry.
- Generate UUIDs for migrations, tests and seeders.
Why use KX Toolkit's HTML Parser
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
Bookmark the most-used tools - your browser bookmark bar is faster than retyping the URL every time.
Related Developer Tools
If you find this tool useful, explore the full Developer Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
How does this differ from inspecting elements in DevTools?
DevTools shows the live DOM of a rendered page including JavaScript-applied changes. The parser tool ingests static HTML you paste in and shows the parsed tree before any script runs. It is useful when reviewing snippets, scraping output, or debugging server-rendered markup without spinning up a browser context. CSS selectors work the same way as querySelectorAll in either tool.
Why do my unbalanced tags get rearranged?
The HTML parsing algorithm is forgiving - it auto-closes mismatched tags and reparents elements according to content-model rules. A stray div inside a table will be lifted out before the table because tables have a strict structure. The output reflects what a browser would actually build, not the literal source. Fix the source if you need the structure preserved.
Can I test CSS selectors against the parsed tree?
Yes. Type a selector and the tool highlights every match, just like document.querySelectorAll. Complex selectors with :has, :is, and :where work in browsers that support them. This is faster than running console queries on the live page and a great way to validate selectors for testing libraries like Playwright before committing them.
Does it execute embedded JavaScript or apply CSS?
No. The parser is purely structural - it builds the DOM tree from the markup but never runs scripts or computes styles. To see the post-script DOM, render the page in a real browser. To compute styles, use DevTools or a tool that wraps a headless browser. The parser is the right level for static analysis tasks.
What can I do once I have the tree?
Walk the tree to count elements, find missing alt attributes, extract text, validate heading hierarchy, or generate selectors for elements you want to test. The structured view makes it obvious when a div soup hides accessibility issues - rows of div without semantic tags jump out instantly compared to scrolling through raw HTML.
Is it safe to paste HTML containing scripts or third-party widgets?
Yes because the tool does not execute anything. Pasting embedded ad code or analytics snippets is harmless from an XSS standpoint. The risk is only confidentiality if the markup contains private data and the tool is server-rendered. Pick a parser that operates entirely in the browser when in doubt about sensitive content.
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