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seo-content-analyzer

On-page SEO content analysis evaluates whether a piece of content is structured to rank well — title length, meta description length, heading hierarchy (H1 > H2 > H3), word count, readability (Flesch / Flesch-Kincaid), keyword density, internal-link count, image alt-text presence. The ZTools SEO Content Analyzer parses HTML or pasted text, scores against established SEO best practices, and flags improvements. Useful as a pre-publish checklist. Doesn't replace tools like Yoast or Surfer for deep optimization — focuses on the universal basics.

Use cases​

Pre-publish content audit​

Before clicking publish, run the article. Title too long? H1 missing? Word count too low for the topic? Fix before going live.

Audit existing content for re-optimization​

Old blog posts. Run analyzer; identify which need refreshing (low word count, missing structure, etc.).

Quick check during writing​

Mid-draft, paste current text. See readability score, suggested length, missing structural elements.

Compare your content vs top-ranking competitors​

Audit both; compare word counts, structure, depth.

How it works​

  1. Paste content (HTML or plain text) — Tool parses to extract structure (headings, paragraphs, lists, links, images).
  2. Run audit — Title length, meta description length, H1 count (should be 1), word count, readability score, keyword density (configurable target keyword).
  3. Display report — Each criterion with pass / warning / fail. Suggestions per failed item.

Examples​

Input: 500-word article, no H1

Output: Word count: warning (typical articles target 1000-1500). H1: fail (missing). Readability: pass (Flesch 65, easy enough).

Input: 2000-word article with proper structure

Output: Word count: pass. Heading hierarchy: pass. Readability: pass. Keyword density: 1.2% — pass.

Frequently asked questions​

What word count is "right"?

Topic-dependent. Quick how-tos: 500-800 words. Definitive guides: 1500-3000+. Top-ranking content for competitive keywords averages 1500+ words.

Keyword density?

Princeton GEO study shows keyword stuffing actively hurts AI visibility (-10%). Aim for 0.5-1.5% — natural use, not stuffed.

Readability score?

Flesch 60-70 (easily understood by 8th-9th graders) is the sweet spot for general audiences. Technical content can score lower.

Privacy?

All in browser.

Tips​

  • Aim for one H1 per page (the main title), then H2s for sections.
  • For target keywords, include in title, first paragraph, at least one H2 — but don't stuff.
  • Check readability — if Flesch < 30, rewrite for clarity.
  • Always include an image alt text — accessibility + SEO double win.

Try it now​

The full seo-content-analyzer runs in your browser at https://ztools.zaions.com/seo-content-analyzer — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-06 · Author: Ahsan Mahmood · Edit this page on GitHub