On-Page SEO Checker
Free, no signup. A concise five-item on-page memo first, with the full raw-HTML detector output available in Advanced.
General preserves the base report. A named profile adds its required-signal checks; unavailable schema guidance and pack weights stay visibly not evaluated.
Checks run from our server; we fetch the URL you enter and don't keep the results. 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.
Sample report
Illustrative example — deterministic raw-HTML findings, not a live site claim
For a 200 page with no title, one H1, a self-canonical, a missing meta description, and an image without alt text, the report would summarize:
2 errors · 1 warning · supporting passes and not-evaluated checks
How to use it
- Enter a public, crawlable page URL and choose Run report.
- Start on Simple: top 5 for the highest-priority memo.
- Open Advanced: all checks to see every supported detector, including passes and not-evaluated states.
- Verify important fixes in the rendered page and Search Console where appropriate.
+ saves the current site or page. Use ☆ beside any saved site, page, or list to favorite it. Recent check history appears below.
Create a named list
Target filled from your local choices.
Site passport Local context for this saved site
Local data
Saved targets, named lists, and recent check summaries remain only in this browser.
Changed page? Compare a selected Wayback capture with the current page.
Rate this tool
What the results mean
- Errors (red) are clear implementation defects or strong blockers supported by the response.
- Warnings (orange) are likely issues that need context before changing the page.
- Needs review (yellow) marks evidence that cannot support a pass or error verdict yet.
- Information (blue) records useful evidence without calling it a defect.
- Pass means that specific observable rule passed, not that the whole page is optimized.
- Not evaluated means no verdict was possible and never counts as a pass.
How it works
The server retrieves the public response because browser cross-origin rules prevent direct inspection. The page context normalizes the final URL, status, headers, and raw HTML, then a deterministic detector registry runs supported technical and on-page checks. The Simple memo prioritizes the same results; it does not use a separate opaque score.
Features
- Five-item prioritized memo plus complete detector output.
- Checks across metadata, headings, canonicals, directives, links, images, and supported markup.
- Hreflang cluster validation follows up to 500 declared URLs with at most six concurrent fetches.
- Evidence-based pass, warning, error, information, and not-evaluated states.
- Escaped output and no fabricated verdicts when evidence is unavailable.
Limitations
This checker does not render JavaScript, run Lighthouse, measure Core Web Vitals, assess accessibility, score writing quality, inspect backlinks, or predict rankings. Hreflang detail shown on the page and in coverage samples is bounded even when validation reaches the 500-URL ceiling. A fetch can also differ from Googlebot because it originates from this site's server infrastructure. Confirm rendered and index-level behavior with purpose-built tools.
Frequently asked questions
What does an on-page SEO checker analyze?
This checker analyzes signals available in the server-returned HTML and response metadata, including titles, descriptions, headings, canonicals, robots directives, links, images, and supported structured-data patterns.
Is a passing report a guarantee that the page will rank?
No. The report identifies observable implementation issues. Rankings also depend on relevance, content quality, competition, authority, internal linking, and signals this raw-HTML tool cannot measure.
Why does the report say not evaluated?
Not evaluated means the checker lacks the evidence or rendering capability needed for a responsible verdict. It is different from a pass and keeps unavailable checks from inflating the result.
Does the checker render JavaScript?
No. It analyzes the raw HTML response. Use a rendered-page tool when a JavaScript application changes metadata, headings, content, or links after load.
Which findings should I fix first?
Start with errors that can prevent crawling, indexing, or a useful search result, then address warnings that affect page meaning. The Simple tab prioritizes five findings using the same detector results shown in Advanced.
Feature requests for On Page Seo 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.
You won't be emailed about that request anymore.
Loading…
➕ Request a feature
New requests are reviewed before they appear here.
ツールについて
優先順位付きの上位5件メモと、見出し、リンク、画像、favicon、ソーシャルメタデータを対象にした高度なraw HTMLチェックを提供します。
公開URLまたは貼り付けたHTMLを確認し、観測したシグナル、検出事項、次に検証すべき項目を一つのレポートにまとめます。
機能
- 上位5件の優先順位メモ
- 見出し・リンク・画像のraw HTML検査
- faviconとソーシャルメタデータの確認
- 検出事項と次の検証手順の整理
仕組み
HTMLのheadと本文からtitle、description、canonical、robots、hreflang、見出し、リンク、画像、favicon、Open Graph、Xカードを抽出します。各チェックを正規化し、重大度と優先順位を付け、上位5件のメモと詳細な根拠を表示します。
制限事項
- 解析は入力されたHTMLまたは取得応答に限られ、Googleのインデックス、ランキング、実際のSERP表示、JavaScript実行後の状態を保証しません。
- スコアや優先順位は観測シグナルの整理であり、順位、トラフィック、成果、ページ全体のアクセシビリティ適合を保証しません。
よくある質問
このチェックはGoogleの実際の判定ですか？
いいえ。取得または貼り付けたHTMLから観測できるシグナルを整理します。Googleの選択やインデックス状態はSearch Consoleなど別の証拠で確認してください。
JavaScriptで追加された内容も解析しますか？
raw HTMLの確認では実行後のDOMを扱いません。必要ならレンダリング後のHTMLを貼り付けて比較してください。
上位5件を直せば順位は上がりますか？
保証されません。優先順位は調査の出発点です。検索意図、品質、競合、実装コスト、実データを合わせて判断してください。