What is SEO Audit?
A systematic review of a website's technical and on-page SEO health.
Written by DidYouSEO Team·Updated April 2026
Definition
An SEO audit is a comprehensive review of a website to identify issues that may prevent it from ranking in search engines. A full audit covers on-page signals (title tags, meta descriptions, headings, content), technical signals (page speed, mobile-friendliness, canonical URLs, robots.txt), structured data (schema markup), and off-page signals (backlinks). The output is typically a prioritized list of issues to fix.
Why it matters for SEO
Search engines like Google use hundreds of signals to decide which pages to rank. An SEO audit surfaces the specific issues on your site that are suppressing rankings - missing title tags, broken canonical tags, slow page speed, missing schema markup, and more. Without an audit, you are guessing which issues to fix. With one, you have a prioritized action list.
How to check seo audit
DidYouSEO runs 30+ on-page and technical SEO checks on any URL in under 30 seconds. It covers title tags, meta descriptions, H1/H2 structure, canonical URLs, Open Graph tags, schema markup, robots.txt directives, page speed signals, and more. Results are categorized as Critical, Warning, or Good.
Check it on your site - free
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Related terms
AI Search Visibility
Whether AI assistants like ChatGPT, Gemini, and Perplexity mention or recommend your brand.
Schema Markup
Structured data added to HTML that helps search engines and AI understand what a page is about.
Core Web Vitals
Google's three user experience metrics: LCP, INP, and CLS.
Canonical URL
An HTML tag that tells search engines which version of a page is the definitive original.