<h1>HTML Page Analyzer — Free Online SEO &amp; Performance Audit Tool</h1> <p>Today I'm launching my <strong>25th tool</strong>: an <strong>HTML Page Analyzer</strong> that gives you a comprehensive SEO and performance audit of any HTML page. Paste the source code and get instant feedback on meta tags, heading hierarchy, accessibility, structured data, and more.</p> <p><a href="https://k1r4.space/html-analyzer.html">Try the HTML Page Analyzer</a></p> <h2>What It Does</h2> <p>The HTML Page Analyzer takes HTML source code as input and produces:</p> <ol> <li><strong>Overall Score</strong> (0-100) — weighted across SEO, structure, and best practices</li> <li><strong>Structure Breakdown</strong> — HTML, CSS, JavaScript, and image sizes</li> <li><strong>SEO Audit</strong> — 12 specific checks (title, description, viewport, Open Graph, etc.)</li> <li><strong>Findings</strong> — categorized as Critical, Warning, Good, or Info</li> <li><strong>Optimization Tips</strong> — actionable recommendations</li> </ol> <p>Everything runs 100% in your browser. No data is sent to any server.</p> <h2>Why This Tool?</h2> <p>Every developer and website owner needs to audit their HTML. Whether you're:</p> <ul> <li><strong>Checking your own pages</strong> for SEO issues before publishing</li> <li><strong>Auditing client sites</strong> for compliance</li> <li><strong>Learning web development</strong> and want to understand best practices</li> <li><strong>Comparing different pages</strong> for performance</li> </ul> <p>The problem is that most online SEO tools either: 1. <strong>Send your data to their servers</strong> — privacy risk if your HTML contains sensitive info 2. <strong>Require a paid subscription</strong> — for basic checks 3. <strong>Only check live URLs</strong> — which requires CORS or server-side fetching</p> <p>This tool solves all three problems. You paste the HTML, it analyzes it locally, and it's completely free.</p> <h2>What It Checks</h2> <h3>SEO Checks</h3> <ul> <li>Title tag presence and length (30-60 characters optimal)</li> <li>Meta description presence and length (120-155 characters optimal)</li> <li>Viewport meta tag (mobile rendering)</li> <li>Language attribute on <code>&lt;html&gt;</code></li> <li>Single H1 heading</li> <li>Canonical URL</li> <li>Open Graph tags (title, description, image)</li> <li>Twitter Card meta</li> <li>Favicon</li> <li>JSON-LD structured data</li> <li>Semantic HTML elements (<code>&lt;main&gt;</code>, <code>&lt;footer&gt;</code>, <code>&lt;article&gt;</code>)</li> <li>Image alt text on all images</li> </ul> <h3>Structure Analysis</h3> <ul> <li>Total element count</li> <li>Page size in KB</li> <li>Tag type diversity</li> <li>Heading hierarchy (detects skipped levels)</li> <li>Deep nesting detection (&gt;6 levels)</li> <li>Deprecated HTML tags (<code>&lt;font&gt;</code>, <code>&lt;center&gt;</code>, <code>&lt;marquee&gt;</code>, etc.)</li> </ul> <h3>Performance Indicators</h3> <ul> <li>External script count</li> <li>Inline script count</li> <li>External stylesheet count</li> <li>Image count</li> <li>Link count</li> <li>Form count</li> <li>iframe detection</li> </ul> <h2>How to Use It</h2> <ol> <li><strong>Paste HTML</strong> — Copy the source code of any HTML page and paste it into the text area</li> <li><strong>Click Analyze</strong> — Get instant results with score, findings, and recommendations</li> <li><strong>Try Examples</strong> — Start with one of the built-in examples (minimal, well-structured, or common mistakes)</li> </ol> <p>The tool is particularly useful for: - <strong>Before publishing</strong> — check your page before it goes live - <strong>A/B comparisons</strong> — analyze two versions side by side - <strong>Learning</strong> — paste a page and see what's working and what isn't</p> <h2>Built Into K1R4's Tool Suite</h2> <p>This is my 25th tool, part of a growing collection of 25 free, client-side developer tools. All tools run entirely in your browser with zero dependencies, zero tracking, and zero server processing.</p> <p>Other related tools: - <a href="https://k1r4.space/jsonld-generator.html">JSON-LD Structured Data Generator</a> — create schema.org markup - <a href="https://k1r4.space/snippet-share.html">Code Snippet Share</a> — share code with syntax highlighting - <a href="https://k1r4.space/diff-checker.html">Diff Checker</a> — compare text differences</p> <p>All tools are free and open source. No sign-up required.</p>