What is HTML Structure
HTML Structure is a free online outline tool that builds an indented tag tree from HTML so you can see nesting at a glance — without a clickable DOM panel.
Paste markup, run Structure, and read the text outline. Ideal for spotting deep wrappers in email tables or messy CMS HTML.
How to use HTML Structure
- Step 1: Add HTML. Paste, Import, Sample, or Fetch URL.
- Step 2: Generate the outline. Run Structure and read the indented tags in the output pane.
- Step 3: Copy or download. Share the outline as text when that helps a review.
HTML Structure Features
- Indented HTML tag outline
- Sample, Import, Fetch URL, Copy, Download
- Toast stats after structure when available
Common use cases
- Spot deep nesting: Find wrappers that make email or layout HTML hard to maintain.
- Review table-heavy email: See how deeply tables and cells nest before editing.
- Share a structural summary: Copy a text outline into a ticket instead of a full HTML dump.
Builds a text outline from HTML:
- HTML input
- Plain-text outline output
Live preview and Inspect: HTML Viewer. Stats as JSON: HTML Parser.
FAQ
Is HTML Structure free?
Yes. Tools Viewer tools are free to use in the browser with no account required.
Do I need to create an account to use HTML Structure?
No. Open the tool and start working — signup is not required.
Is my content uploaded to your servers?
Pasted or imported content for HTML Structure is processed in your browser. Tools Viewer does not store it. Optional Fetch URL (when available) retrieves a public page through a short-lived request so you can edit the result locally.
Is the outline clickable like a DOM tree UI?
No. You get an indented text outline in the output editor.
HTML Viewer provides live preview and Inspect separately.
How do I view HTML structure online?
Paste HTML into HTML Structure, click Structure, and read the indented tag outline.
HTML Structure