Run SEO Audit
Free SEO, GEO & AEO Checker

Run SEO Audit and Improve your Website's Ranking.

Run instant visual reports on Core Web Vitals, PageSpeed performance, schema data models, mobile usability, and search engine crawler guidelines.

For example:

100% Free Audit • Instant Analysis • Privacy-First & No Tracking

Verify and optimize all critical checkpoints.

Run SEO audits the website's configuration using Google's search metrics and standard engineering best practices.

Core Web Vitals

Analyze cumulative layout shifts, initial content painting, and script execution delays that drag down Google ranking.

AI Crawler Indexing

Verify if LLMs like ChatGPT, Gemini, and Claude can fetch and index your content models with structured JSON-LD schemas.

Security & Clean Markup

Check SSL/HTTPS setup, robots.txt, sitemaps, headers, and semantic header structure.

Optimizing Visibility: Complete Website SEO Audit Guide

Resources • Technical Documentation • Advanced Engineering

1. Deciphering the Modern Technical SEO Site Audit

In the competitive landscape of search algorithms and LLM crawlers, carrying out a comprehensive website seo audit is one of the most critical steps to guarantee search discoverability. As search algorithms evolve to incorporate Core Web Vitals, semantic schema structures, and AI crawler protocols, reliance on legacy systems will fall short. Run SEO is designed to address these gaps as a leading free seo checker, website seo checker, and seo checker online, allowing web creators, developers, and marketers to evaluate their codebases instantly. By conducting a thorough seo check of website properties regularly, you can pinpoint indexation issues, performance bottlenecks, and mobile usability hurdles before they affect your search ranking or user click-through rates.

A true technical seo audit evaluates the underlying code of a site rather than just counting keyword occurrences. It starts at the infrastructure level, verifying that your server returns proper HTTP status codes (e.g. 200 OK for successful pages, 301 Moved Permanently for redirected resources, and 404 Not Found for missing documents). Redirection loops or broken links waste search crawler resources and degrade your user experience, directly leading to drop-offs.

2. Understanding the Crawling Budget: Sitemaps & Robots.txt

Search engines do not have infinite resources; they allocate a specific "crawl budget" to every domain. To optimize this budget, you must maintain a clean technical seo checklist. Your robots.txt file serves as the instruction manual, directing bots like Googlebot, Bingbot, and AI scrapers on which directories are off-limits. Meanwhile, your sitemap.xml functions as the catalog of your website's primary landing pages.

Ensuring that your sitemap is correctly declared inside your robots.txt file allows search spiders to find and crawl new pages instantly. Furthermore, you must verify that pages listed in your sitemap are not blocked by robots.txt rules, as this contradiction can confuse indexation pipelines.

3. The Rise of AI Clouds: Optimizing for ChatGPT, Claude, & Gemini

The search landscape has expanded beyond traditional query-and-link systems. Today, millions of users ask questions directly to large language models (LLMs) via Perplexity, ChatGPT Search, and Gemini. These AI clouds fetch real-time web content using specialized user-agents. To verify your visibility, modern seo check online tools must analyze whether AI user-agents (such as OpenAI's GPTBot, OAI-SearchBot, and Anthropic's Claude-Web) are permitted to crawl your content.

Blocking these bots prevents your brand from being cited as a source in AI-generated answers. Additionally, feeding AI engines structured data models like JSON-LD makes it easier for them to summarize and present your business facts correctly.

4. Core Web Vitals: Speed as a Direct Ranking Signal

Google's search essentials place significant emphasis on mobile accessibility, security, and rendering performance. An seo check online can highlight when your mobile tap targets are too small or when you lack an active SSL certificate. Utilizing a free seo check gives you instant clarity on these ranking components. Our platform stands out from typical seo audit services and static seo audit service providers by focusing heavily on modern web standards. Unlike traditional audits that only verify basic meta description text, Run SEO acts as a deep technical seo audit evaluator. It checks sitemap locations, robots.txt crawl configurations, and whether your layout avoids major layout shifts (CLS).

To improve your Core Web Vitals, you must minimize render-blocking scripts, split large CSS files, compress and resize images to WebP/AVIF formats, and define explicit height and width parameters on layout blocks to eliminate Cumulative Layout Shift (CLS). A fast page load is no longer just a UX metric—it is a critical ranking factor.

5. Semantic HTML & Canonicalization Integrity

A clean on page seo checklist must verify that your page uses semantic HTML5 tags. Search engines use tags like <header>, <nav>, <main>, and <footer> to understand the layout of your page. Furthermore, your heading hierarchy must be structured logically, starting with a single <h1> that details the page's main topic, followed sequentially by <h2> and <h3> sub-headers without skipping levels.

Additionally, you must implement canonical links (<link rel="canonical" href="...">) to signal to search engines the authoritative URL of a page. This prevents duplicate content penalties if your site is accessible via multiple query paths, HTTP/HTTPS variants, or subdomains.

6. Continuous Integration & SEO Audits

Optimizing a site is not a one-off event. Search ranking requires constant iteration. Combining our seo checklist with a custom seo audit checklist allows developers to track items from start to finish. Ensure you execute a free seo audit after every code deployment to catch regressions in page load speeds or metadata structures. Using an seo checker online is the fastest way to confirm that your site remains visible, secure, and ready for the future of search.

For e-commerce platforms and local services, maintaining specialized lists—such as a shopify seo checklist or a local seo checklist—ensures that address formats, reviews, product prices, and stock availability are mapped cleanly for local search packs and shopping carousels.

7. Generative Engine Optimization (GEO) & Answer Engine Optimization (AEO)

With the integration of AI search summaries, traditional indexing is no longer the final step. Generative Engine Optimization (GEO) and Answer Engine Optimization (AEO) are critical strategies designed to ensure LLMs select your content to build their conversational responses. Unlike traditional rankings which rely on link citations, generative engines parse pages to answer queries directly.

To optimize for GEO and AEO, structure your information in direct conversational formats, use highly semantic schemas, write clean summaries, and back your claims with unique statistics and citations. This makes your page highly "citable" when engines like Perplexity, ChatGPT Search, or Google Gemini synthesize search results.

Frequently Asked Questions

Answers to common questions about SEO audits & checkups

What is an SEO audit and why is it important?

An SEO audit is a comprehensive evaluation of a website's search engine health, crawl accessibility, and user experience signals. It is important because it identifies technical errors, indexing blockers, and slow page speeds that prevent your pages from ranking higher in Google Search and AI clouds.

How do you perform a complete SEO audit?

To perform a complete SEO audit, you should check your site's technical structure (SSL security, redirections, robots.txt settings), analyze on-page factors (title tags, meta descriptions, image dimensions, headings), measure site performance metrics (Core Web Vitals, initial paint speed), and assess search visibility (JSON-LD schema markup, OpenAI GPTBot crawl permissions). Run SEO simplifies this by running a free website checker online in 4 seconds.

How to conduct a technical SEO site audit?

Conducting a technical SEO site audit involves analyzing the hidden backend code of your pages. Focus on checking sitemap declarations, verifying clean semantic HTML5 tag layouts (avoiding heading hierarchy jumps), ensuring tap targets are mobile-friendly (>= 44px), and checking that search crawlers are not blocked by erroneous robots.txt rules.

How to make an SEO audit report?

You can create an SEO audit report by compiling Lighthouse scores, security verifications, and prioritized action guidelines. In Run SEO, you can enter any website URL, run a checkup, and hit the Export Report button. This renders a print-optimized document ready to be saved as a clean PDF or printed for clients.

How much does an SEO audit cost?

A professional manual SEO audit service can cost anywhere from $500 to over $5,000 depending on site complexity. However, Run SEO provides an instant, comprehensive technical site audit and interactive checklist 100% free of charge with copyable solutions for common bugs.

What is an SEO checklist and how to prepare a template?

An SEO checklist is a structured playbook that outlines all search optimization checks from beginning to end. You can prepare an SEO checklist template by cataloging rules from Google Search Essentials. Our interactive SEO checklist acts as a live, browser-saved checklist template (persisted via LocalStorage) so you can track sitemaps, OpenGraph tags, and AI engine rules step-by-step.

What is the difference between a free SEO checker and Google Lighthouse?

While Google Lighthouse is a fantastic tool for general web performance, accessibility, and best practices, a dedicated website SEO checker like Run SEO extends these metrics. We analyze specific search engine requirements such as sitemap integrity, canonical headers, robots.txt bot rules (like ChatGPT's GPTBot), heading hierarchies, semantic HTML validation, and schema structures. Our tool bridges the gap between raw web engineering and modern SEO ranking metrics.

Why does my technical SEO audit report show Core Web Vitals issues?

Core Web Vitals measure user experience signals: Largest Contentful Paint (LCP) for loading speed, Interaction to Next Paint (INP) for responsiveness, and Cumulative Layout Shift (CLS) for visual stability. If your audit shows errors, it is usually due to heavy unused JavaScript, render-blocking CSS, unoptimized images lacking explicit dimensions, or layout shifts caused by dynamic content injection. Resolving these is crucial because Google uses Core Web Vitals as direct ranking signals.

How do I optimize my website for AI search engines like Perplexity, ChatGPT Search, and Gemini?

AI search engines crawl the web to summarize and cite answers. To optimize for AI visibility:

  1. Ensure indexing access: Do not block user-agents like GPTBot, OAI-SearchBot, Claude-Web, or Google-Extended in your robots.txt file.
  2. Implement JSON-LD Schema: Provide rich schemas (Product, Article, FAQPage) so LLMs can easily parse your content.
  3. Write semantic HTML: Use clear heading structures (h1, h2, h3) and clean body text structures to make data extraction efficient.
What is the purpose of robots.txt and sitemap.xml files?

A robots.txt file acts as a gatekeeper that tells search crawlers which paths they are allowed to visit on your server. A sitemap.xml file is an index of all important pages that you want search engines to crawl and index. Together, they optimize your "crawl budget"—the number of pages a search bot crawls on your site during a visit. Declaring your sitemap inside your robots.txt file helps engines find your content instantly.

How often should I run a free technical website SEO checkup?

You should run a free SEO check after every major code deployment, layout change, or content update. Regressions in page speed, broken redirects, accidental sitemap exclusions, or misconfigured header tags can happen during updates. Regular checks ensure your SEO guidelines are met continuously and prevent ranking drops.

What is the difference between SEO, GEO, and AEO?

SEO (Search Engine Optimization) focuses on ranking web pages in traditional search engine results. GEO (Generative Engine Optimization) optimizes content to be retrieved, cited, and recommended by AI engines like Perplexity, ChatGPT Search, and Gemini. AEO (Answer Engine Optimization) specifically optimizes web content to answer direct, conversational user questions, especially for voice queries and virtual assistants.

What are the most effective tactics for GEO and AEO?

The most effective tactics include:

  1. Conversational Q&A formats: Structure information in clear, direct questions followed by short, punchy answers under 80 words.
  2. High semantic density: Use conceptual synonyms and focus on topic relevance to align with LLM vector embeddings rather than keyword stuffing.
  3. JSON-LD structured schemas: Implement schemas like FAQPage or Product to provide machine-readable metadata.
  4. Citations & authoritative sources: Cite unique statistics, surveys, and expert credentials to become a reliable reference point for generative answers.

Need a step-by-step checklist?

Follow our comprehensive Google-compliant SEO checklist page to review sitemaps, semantic layout, viewport targets, and redirects in order.

View SEO Checklist