Heading Structure Checker

Free, no signup. See the heading outline readers and crawlers receive, spot skipped levels and empty headings, then preview a practical table of contents.

Built by Patrick Stox

A calibrated check: multiple H1s and title/H1 differences are not automatic SEO errors. This separates those normal patterns from genuine outline problems.

HTML

Checks run from our server; we fetch the URL you enter and don't keep the results. Pasted HTML stays in your browser; URL mode sends only the URL to retrieve its HTML. Anonymous run-level outcome counters may be used for aggregate research; URLs, domains, IPs, and identifiers are never included, and no statistic is released below 100 runs.

Feedback

Sample report

Illustrative example — generated from the HTML shown here

<h1>Technical SEO audit</h1>
<h3>What should I fix first?</h3>
<p>Fix pages that cannot be crawled or indexed before polishing metadata.</p>
<h2></h2>

3 headings found

Warning: H1 jumps to H3; the H2 level is skipped.
Error: one empty heading creates an unlabeled section.
Answer-ready candidate: “What should I fix first?” has a direct following paragraph.
TOC preview: only labeled headings appear; headings without an ID have no durable fragment link.

How to use it

Choose Paste HTML for a local or rendered fragment, or Fetch a URL for a public page's server response.
Run the check and read the outline before the issue list. Confirm that the hierarchy matches the ideas on the page.
Use the table-of-contents preview to spot vague labels and headings without durable fragment IDs.
Review question headings with their following paragraphs; a question is only answer-ready when the next paragraph answers it directly.

What the results mean

Pass means the observed raw-HTML pattern is structurally sound.
Information supplies context, such as multiple H1s, without calling it an error.
Warning identifies a likely usability issue worth reviewing, including skipped levels.
Error identifies a clear defect such as an empty heading.
Needs review means the response did not contain enough evidence for that check.

How it works

The checker parses the supplied HTML in your browser, extracts semantic h1 through h6 elements in document order, and builds a nested outline from their levels. The same detector registry evaluates missing, empty, repeated, and skipped-level patterns. It does not infer headings from bold or large text.

Features

Paste and URL-fetch modes.
Nested heading outline and practical table-of-contents preview.
Calibrated findings that avoid labeling every multiple-H1 pattern an error.
Question-heading candidates paired with the next paragraph.

Limitations

URL mode reads raw HTML, not the rendered DOM, so JavaScript-added headings are absent. The preview assesses structure, not whether the copy is accurate, useful, or aligned to search intent. It also cannot determine visual styling or screen-reader behavior beyond the supplied markup. Use Render Gap when headings may be injected by JavaScript →

Frequently asked questions

Is more than one H1 always bad for SEO?

No. Multiple H1 elements are valid in modern HTML and are not automatically an SEO problem. A clear primary page heading is still useful for readers, so the checker reports multiple H1s as context rather than treating them as an error.

Do heading levels have to increase one at a time?

A skipped level such as H2 to H4 usually signals a confusing document outline. It is not a direct ranking penalty, but correcting the hierarchy improves navigation and accessibility.

Why are JavaScript-injected headings missing?

URL mode analyzes the raw HTML response and does not render JavaScript. Paste the rendered HTML from your browser if a client-side application adds headings after load.

Does changing a heading tag improve rankings?

Not by itself. Heading structure helps communicate organization and meaning, but useful content and search intent matter more than changing an H3 to an H2 in isolation.

Next stepContent Gap Analyzer — look up the exact spec and expected values.

Feature requests for Heading Structure Checker

Upvote what you want most. New ideas can be submitted from the floating Feedback menu; requests appear here once approved, and the most-wanted rise to the top.

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➕ Request a feature

New requests are reviewed before they appear here.

Tentang alat

skipped tingkat seperti sebagai H2 untuk H4 biasanya sinyal confusing dokumen outline. Ini tidak langsung peringkat penalty, tetapi correcting hierarchy improves navigasi dan accessibility.

Tempel HTML

Tidak. Multiple H1 elements adalah valid di modern HTML dan tidak secara otomatis SEO masalah. jelas utama halaman heading adalah masih berguna untuk readers, so pemeriksa laporan multiple H1s sebagai konteks daripada daripada treating mereka sebagai kesalahan.

Fitur

Pilih Tempel HTML untuk lokal atau dirender fragment, atau Ambil URL untuk publik halaman's respons server. Jalankan periksa dan baca outline sebelum masalah daftar. Konfirmasi yang hierarchy cocok ide pada halaman. Gunakan tabel-dari-contents preview untuk spot vague memberi label dan headings tanpa durable fragment IDs. Tinjau pertanyaan headings dengan mereka following paragraphs; pertanyaan adalah hanya jawaban-ready ketika berikutnya paragraph menjawab ini secara langsung.
Heading Structure Pemeriksa
Tempel dan URL-ambil modes. Nested heading outline dan practical tabel-dari-contents preview. Calibrated temuan yang avoid labeling setiap multiple-H1 Pola kesalahan. Pertanyaan-heading candidates paired dengan berikutnya paragraph.
URL mode membaca mentah HTML, tidak dirender DOM, so JavaScript-added headings tidak ada. preview assesses structure, tidak apakah salin adalah accurate, berguna, atau selaras untuk pencarian maksud. Ini juga tidak dapat determine visual styling atau screen-reader perilaku di luar yang diberikan markup. Gunakan Render Gap ketika headings mungkin menjadi injected oleh JavaScript →
URL mode analyzes mentah HTML respons dan tidak render JavaScript. Tempel dirender HTML dari Anda browser jika klien-side aplikasi menambahkan headings setelah muat.

Cara kerja

Home › Alat › Heading Structure Pemeriksa heading levels memiliki untuk increase satu di waktu? Memeriksa HTML

Batasan

Tempel HTML atau ambil publik URL untuk visualize heading-nya outline, identifikasi skips dan kosong headings, dan preview tabel dari contents.
Melakukan berubah heading tag improve peringkat?
Periksa headings
Heading outline

Pertanyaan umum

Adalah lebih banyak daripada satu H1 always bad untuk SEO?

Lulus berarti teramati mentah-HTML Pola adalah structurally sound. Information supplies konteks, seperti sebagai multiple H1s, tanpa calling ini kesalahan. Peringatan mengidentifikasi kemungkinan usability masalah worth meninjau, termasuk skipped levels. Kesalahan mengidentifikasi jelas cacat seperti sebagai kosong heading. Needs tinjau berarti respons tidak contain cukup bukti untuk yang periksa.

Tabel dari contents preview

Gratis, tanpa pendaftaran. Melihat heading outline readers dan perayap terima, spot skipped levels dan kosong headings, lalu preview practical tabel dari contents.

Mengapa adalah JavaScript-injected headings hilang?

pemeriksa parses yang diberikan HTML di Anda browser, mengekstrak semantik h1 melalui h6 elements di dokumen urutan, dan membangun nested outline dari mereka levels. sama detector registry evaluates hilang, kosong, repeated, dan skipped-tingkat pola. Ini tidak infer headings dari bold atau large teks.

Pertanyaan headings → jawaban-ready candidates pertanyaan heading adalah hanya candidate; following paragraph seharusnya jawaban ini secara langsung dan independently.

calibrated periksa: multiple H1s dan judul/H1 differences tidak automatic SEO kesalahan. Ini memisahkan itu normal pola dari genuine outline masalah.