How to Do an SEO Audit — Step by Step (Free)

What Is an SEO Audit and Why You Need One

An SEO audit is a comprehensive analysis of your website's current SEO performance — identifying what's working, what's broken, and what opportunities you're missing. Think of it as an annual health check for your site's visibility on Google.

Audits reveal issues that are silently costing you rankings: crawl errors you don't know about, duplicate content diluting your authority, thin pages dragging down your site quality score, and missed technical optimizations.

This guide takes you through the full audit process using primarily free tools.

Step 1: Set Up Your Monitoring Tools

Before starting, ensure these are in place:

• Google Search Console: Verified and collecting data (takes 48-72 hours to start showing data after verification)
• Google Analytics 4: Tracking all traffic
• Screaming Frog: Download the free version (500 URL limit on free)
• Ahrefs Webmaster Tools: Free backlink and technical data for your own site

Step 2: Technical SEO Audit

Crawlability Check

1. Enter your domain in Screaming Frog and start a crawl
2. Check robots.txt isn't blocking important pages (Response Codes tab → filter 0 status code)
3. Review the XML sitemap for errors and missing pages
4. Check for noindex tags on pages that should be indexed (Page Titles tab → noindex filter)

Index Coverage (Google Search Console)

1. Open Search Console → Indexing → Pages
2. Review "Not indexed" pages and understand why (404, noindex, soft 404, canonical, etc.)
3. Investigate any "Discovered but not indexed" pages — these are crawl budget issues

Page Speed Audit

1. Run your homepage and key landing pages through PageSpeed Insights
2. Note Core Web Vitals scores: LCP, INP, CLS
3. Also check Search Console → Experience → Core Web Vitals for sitewide data

Step 3: Content Audit

Identify Your Top and Bottom Performers

In Google Search Console → Performance → Pages:

• High impressions, low CTR: Title/meta description optimization opportunity
• High position 11-20: Content just off page 1 — refresh and build links
• Pages with zero impressions: Not indexed, wrong keywords, or too new

Content Quality Assessment

For your 20 lowest-performing pages, manually assess:

• Is the content thin (under 500 words for complex topics)?
• Is it outdated (contains information from 2+ years ago that's changed)?
• Is it a duplicate or near-duplicate of another page on your site?
• Does it match the search intent of its target keyword?

Keyword Cannibalization Check

In Search Console → Performance, filter by a keyword and see which pages are competing. If multiple pages rank for the same keyword, you have cannibalization to resolve.

Step 4: Backlink Audit

In Ahrefs Webmaster Tools → Backlinks:

• Review referring domains — do you have a healthy diversity?
• Check for spammy referring domains with very low DR scores
• Look for lost backlinks you could reclaim
• Compare your referring domain count vs. your top competitors

Step 5: Prioritize and Create Your Action Plan

After the audit, you'll have a long list of issues. Prioritize by:

1. Impact: How much ranking improvement will fixing this deliver?
2. Effort: How hard is this to fix?
3. Dependencies: Does this need to be fixed before something else can work?

A typical priority order: fix critical technical issues first → improve thin content → optimize meta tags for CTR → build links to target pages.

Frequently Asked Questions