If your website isn’t getting the organic traffic you expect, the problem usually isn’t your content—it’s hidden technical issues, missing keywords, or poor site structure.
A comprehensive SEO audit acts as a health checkup for your website. It uncovers exactly why search engines like Google might be holding your pages back and shows you how to fix them.
In this step-by-step guide, we’ll walk you through how to run a full SEO audit in under 30 minutes using Semrush, one of the industry’s premier SEO toolkits.
What Is an SEO Audit?
An SEO audit is the process of analyzing how well your web site aligns with search engine best practices. A thorough audit evaluates:
- Technical SEO: Crawl errors, page speed, broken links, and mobile responsiveness.
- On-Page SEO: Content quality, title tags, meta descriptions, and keyword targeting.
- Off-Page SEO: Backlink profile strength, toxic links, and referring domains.
Step 1: Run an Automated Technical Site Audit
Technical errors like broken links, slow loading times, or unindexed pages can crush your rankings before you even publish content.
- Open Semrush and head to the Site Audit tool under the SEO menu.
- Enter your website’s domain URL and click Start Audit.
- Allow the crawler a few minutes to scan your site’s pages.
Semrush will generate an Overall Site Health Score out of 100%, categorizing issues into:
- Errors (High Priority): Critical issues like 404 errors, broken internal links, or missing title tags.
- Warnings (Medium Priority): Uncompressed images, missing alt tags, or low word count pages.
- Notices (Low Priority): Minor formatting tweaks and technical suggestions.
Pro Tip: Focus on fixing all items under the Errors tab first. Resolving critical crawl blocks often gives your site an immediate visibility boost.
Step 2: Check Your Domain Overview & Competitor Rankings
Next, you need a baseline of where your site currently stands compared to your top competitors.
- Navigate to Domain Overview in Semrush.
- Enter your domain name to view key metrics: Authority Score, Organic Search Traffic, and Total Backlinks.
- Scroll down to the Main Organic Competitors section to identify which websites are currently taking the traffic for your target keywords.
Step 3: Identify Keyword Gaps
If your competitors are ranking for profitable terms that you aren’t targeting, you’re leaving money on the table.
- Go to the Keyword Gap tool.
- Enter your domain alongside up to 4 competitor domains.
- Filter by Missing or Weak keywords.
This generates an instant list of terms your competitors rank for, but your site doesn’t—giving you a ready-made content plan for your next blog posts.
Step 4: Audit Your Backlink Profile
Backlinks remain a primary ranking signal for search engines. However, spammy or toxic links pointing to your site can trigger search penalties.
- Select Backlink Analytics in the Semrush sidebar.
- Check your Network Graph and Toxic Score.
- If Semrush flags suspicious links from spam sites, use the Backlink Audit tool to review and build a disavow file to submit to Google.
Try Semrush Free for 7 Days
Performing a manual SEO audit can take days, but using automated tools streamlines the entire process into actionable steps.
Whether you run an e-commerce store, a tech blog, or a local business site, knowing your site’s health score is the first step toward ranking on page one.