What is an on-page SEO audit?

An on-page SEO audit evaluates all the HTML elements of a single page that search engines use to understand and rank its content: title tag, meta description, heading structure, image alt text, internal and external links, word count, keyword usage, page speed signals (via HTML indicators), and technical tags like canonical, robots meta, and structured data. It does not include off-page factors like backlinks.

What is a good SEO score?

The analyzer uses a 0–100 scale. 80+ indicates strong on-page SEO with few or no critical issues. 60–79 is acceptable but has meaningful improvement opportunities. 40–59 has several issues that are likely affecting rankings. Below 40 has critical SEO problems that should be fixed before the page can be expected to rank. Note that SEO score is one factor among many — a page with a high score can still rank poorly if it lacks backlinks or targets an extremely competitive keyword.

How do I get my page's HTML source?

In any browser: right-click on the page → View Page Source (or Ctrl+U / Cmd+Option+U). Select all (Ctrl+A), copy (Ctrl+C), and paste into the analyzer. For pages behind login walls or JavaScript-heavy SPAs where View Page Source doesn't show rendered content, use the browser's Developer Tools → Elements panel, right-click the tag → Copy → Copy outerHTML.

Does this analyzer check page speed?

The analyzer checks HTML-level signals that correlate with page speed: image presence of width/height attributes (prevents layout shift), render-blocking resource count (scripts in without defer/async), and inline CSS volume. It does not measure actual load time — for that you need Lighthouse (built into Chrome DevTools) or PageSpeed Insights.

What is keyword density and what's a good target?

Keyword density is the percentage of words on a page that match a target keyword. The analyzer calculates density for the top 5 most-frequent non-stopword terms. A density of 1–3% for your primary keyword is generally healthy. Below 0.5% may indicate the page doesn't emphasize the keyword enough; above 4–5% risks keyword stuffing penalties. Modern SEO focuses more on natural semantic relevance than precise density targets.

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Is This Page Optimized Well Enough to Rank?

Is this page optimized well enough to rank? Get a full SEO audit in seconds.

What This Does

Most SEO problems are on-page problems that can be identified and fixed without any external tools, backlink data, or paid subscriptions. Missing meta descriptions, title tags over 60 characters, H1 tags that don't match the intended keyword, images without alt text, broken heading hierarchy, duplicate content signals, and thin word count are all issues that show up in the HTML and can be audited in seconds. The SEO Analyzer performs a complete on-page audit against the most important ranking signals: title tag (length, keyword presence, uniqueness), meta description (length, call to action, keyword usage), heading structure (H1 existence, H1/H2/H3 hierarchy, keyword alignment), image optimization (alt text coverage, file name patterns), link profile (internal vs external ratio, broken anchor text, nofollow usage), content signals (word count, keyword density, reading level proxy, content-to-HTML ratio), and technical signals (canonical tag, robots meta, viewport tag, structured data presence). For each element, the analyzer produces a pass/warn/fail status with a specific, actionable fix — not just a score, but the exact text that needs to change and why. The overall SEO score (0–100) is broken down by category so you can see where the page is strong and where to focus improvement effort. All analysis runs against the HTML you paste — there are no network requests, no crawling delays, and no rate limits.

Assumptions

·Title tag ideal length: 30–60 characters
·Meta description ideal length: 145–160 characters
·Minimum recommended word count for ranking: 300 words (thin content threshold)
·Image alt text: all non-decorative images should have descriptive alt text
·All analysis is performed on pasted HTML — no network requests are made

When Should You Use This?

→Auditing a new page before publishing to catch basic on-page SEO issues
→Checking a client's or competitor's page source for SEO issues and opportunities
→Validating that a CMS-generated page has the expected title, meta, and heading structure
→Quickly identifying why a page might be underperforming in search rankings
→Running a lightweight audit when you don't have access to a paid SEO tool
→Training a team on on-page SEO best practices by walking through real examples

Example Scenario

Sofia is a freelance SEO consultant auditing a new client's landing page before launch. She copies the page's HTML source and pastes it into the analyzer. Score: 61/100. Issues found: title tag is 78 characters (should be ≤60), meta description is 112 characters (should be 145–160), no H2 or H3 tags (heading structure is flat), 8 of 12 images have no alt text, content-to-HTML ratio is 18% (low — suggests heavy template markup), and no canonical tag. The report gives her a prioritized fix list. She sends the client a PDF of the report with the specific changes needed — saved 2 hours of manual checking.

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100% private. HTML is analyzed locally in your browser — no content is transmitted to any server.

Paste full HTML source (Ctrl+U in browser to get it)

SEO Analyzer — Complete On-Page SEO Audit

Paste any page's full HTML source and get a complete on-page SEO audit in seconds. The analyzer checks 15+ ranking signals across 5 categories: Title tag (length, keyword presence), Meta description (length, quality), Headings (H1 existence, structure, hierarchy), Content (word count, text-to-HTML ratio), Images (alt text coverage), Links (internal/external ratio, nofollow), and Technical (canonical tag, viewport, robots meta, structured data). Each check returns a pass/warn/fail status with a specific, actionable fix. The keyword analysis shows top 8 terms with density scores.

FAQs

How do I get a page's HTML source?

In any browser: right-click → View Page Source (or Ctrl+U). Select all, copy, and paste here. For JavaScript-rendered pages, use DevTools → Elements → right-click <html> → Copy outerHTML.

What's the most important SEO check?

Title tag and H1 tag — these are the strongest on-page signals for what a page is about. A missing or poorly written H1 is one of the most common SEO mistakes.

What keyword density is ideal?

1–3% for your primary keyword. Below 0.5% may indicate under-emphasis; above 4–5% risks keyword stuffing penalties. Modern SEO values semantic relevance over precise density targets.

Does this check page speed?

HTML-level signals only (defer/async scripts, image dimensions). For actual load time measurement, use Lighthouse (Chrome DevTools → Lighthouse tab).