Reading a heading outline

An outline is a table of contents for the draft in front of you. It is not a crawl of the live web and it is not a ranking score.

Paste HTML headings, markdown-style hashes, or labeled lines such as H2: Sampling into the heading checker. The tree lists each heading in order from H1 to H6. If the paste is larger than 300 KB, the page asks you to trim it so the tab stays responsive.

Several H1 headings are reported as a structure note. Readers—and some templates—treat H1 as the page title. Two of them can make it unclear which line is the name of the document. HTML5 allows more than one H1 in some layouts; that does not make the outline easier to scan. Decide on purpose, not because a tool invented a penalty.

Skipped levels (H1 then H4) are worth a look for the same reason: a person jumping by headings may miss the step you meant to keep. The checker lists what you pasted. It does not rewrite the article.