About the SEO Content Analyzer
The SEO Content Analyzer runs a target keyword against the pasted article and grades it across four categories: keyword usage (placement in title, H1, first 100 words, H2s, meta description; density 1–2%), content structure (single H1, descriptive H2/H3 hierarchy, paragraph length), readability (Flesch grade level, sentence-length variance), and content depth (word count vs intent, topical coverage, semantic-variation breadth). Each check returns pass / warning / fail with the specific edit needed.
It is built for content marketers pre-publish QA-ing a blog post, SEO consultants auditing a client’s underperforming page, in-house teams enforcing editorial guidelines at scale, agency writers without dedicated SEO oversight, and anyone tired of vague “optimize for the keyword” advice that does not tell them where the keyword needs to appear.
All analysis runs locally in your browser. Target keyword, full article text, and the four-category scoring are never transmitted off your device. The page makes no network call after first load. Pre-publish content — especially competitive content like product launches and lead-gen guides — is exactly the kind of input that does not belong on a third-party SEO tool that logs every query.
On-page SEO is necessary, not sufficient. A perfect 95-point on-page score will not outrank a domain with 10× the backlink authority on a transactional query. Length, depth, and structure get you into the top 10; off-page signals, technical SEO (Core Web Vitals, crawl budget, schema), and demonstrated user satisfaction (dwell time, return visits) decide the top 3. Use this score as a quality floor, not a ranking guarantee.
Semantically related terms that should appear in your content for topical depth.
Paste competitor content to see what topics they cover that you don’t.
How to Use the SEO Content Analyzer
Enter the keyword you want to rank for and paste your content into the text area. The analyzer scores your content across four critical SEO dimensions and provides specific, actionable recommendations. Use heading markers (# for H1, ## for H2, ### for H3) to help the structure analysis detect your headings correctly.
What Is On-Page SEO?
On-page SEO refers to the optimization of content and HTML elements on individual web pages. Unlike off-page SEO (backlinks, domain authority), on-page factors are entirely within your control. The most impactful elements include keyword placement, heading structure, content length, readability, and topical coverage depth.
Keyword Density: The Modern Approach
The old approach of stuffing keywords into every paragraph is outdated and penalized. Modern SEO aims for a natural keyword density of 1–2%, which means your target keyword appears roughly once per 100–200 words. More important than exact density is natural placement: in the first 100 words, in headings, and in variations throughout the content.
Why Content Structure Matters for SEO
Search engines use headings to understand content hierarchy and topic organization. Proper H2/H3 usage helps Google identify subtopics within your page, improving your chances of ranking for related queries. Well-structured content also reduces bounce rate by making it easier for readers to scan and find what they need.
Readability and Search Rankings
Google has confirmed that readability is an indirect ranking factor. Content written at a 7th–9th grade reading level tends to perform best in search results because it reaches the widest audience. Long sentences, complex vocabulary, and wall-of-text paragraphs increase bounce rate, which signals to Google that users aren’t finding what they need.
Looking for related tools? Try our Headline Analyzer to score your titles for clicks and engagement, or explore all Writing & Content tools.
Frequently Asked Questions
What is the ideal keyword density?
1 to 2 percent. Below 0.5 percent signals weak topic relevance; above 2.5 percent risks appearing spammy and can trigger over-optimization penalties. The target keyword should appear naturally in the title, H1, first 100 words, at least one H2, and the meta description.
Where should the target keyword appear on a page?
At minimum in the SEO title, H1, URL slug, first paragraph, at least one H2 heading, meta description, and image alt text on the hero image. Semantic variations and synonyms should appear throughout the body to establish topical depth.
How long should content be for SEO?
Length depends on search intent. Quick-answer queries rank with 600 to 900 words, comparison and how-to content typically needs 1,500 to 2,500 words, and pillar guides often exceed 3,000 words. Match the length of the top three ranking pages for the target keyword.
What is the difference between on-page and off-page SEO?
On-page SEO covers elements inside the page, such as content, headings, keyword placement, internal links, meta tags, and readability. Off-page SEO covers external signals like backlinks, domain authority, and brand mentions. On-page factors are entirely within the publisher's control.
Why does heading structure matter for SEO?
A clear H1 to H2 to H3 hierarchy helps Google understand the logical structure of the content and increases eligibility for rich results like featured snippets. Pages with a single H1 and multiple descriptive H2s outperform wall-of-text pages in both ranking and dwell time.
