Ahrefs Site Audit Guide: Cloud-Based Technical SEO Walkthrough

Maintaining a technically sound website requires ongoing monitoring to catch broken pathways, indexing blocks, metadata duplication, and schema errors before they undermine organic rankings. While desktop crawlers rely on local hardware and manual crawl execution, cloud-based auditing platforms offer scheduled, automated scanning that tracks technical health continuously.

The Ahrefs Site Audit tool is one of the most widely used cloud crawlers in digital marketing. It automatically scans domains for over 170 pre-defined technical and on-page SEO issues, correlates crawl data with organic keywords and backlink metrics, and provides an actionable Health Score. This guide walks through project setup, crawl configuration, diagnostic reports, advanced URL analysis, and workflow optimization using Ahrefs Site Audit.

Why Use Ahrefs Site Audit?

Unlike standalone crawlers that analyze code in isolation, Ahrefs integrates technical crawl logs directly with its backlink index and organic keyword database. This integration delivers distinct advantages:

• Cloud-Based Operation: Crawls run entirely on remote Ahrefs cloud infrastructure, meaning large enterprise scans never drain local RAM, CPU, or network bandwidth.
• Automated Recurring Audits: Set daily, weekly, or monthly crawl schedules to detect regressions, broken links, or canonical mistakes immediately after new code deployments.
• Automated Internal Link Opportunities: Suggests contextual internal linking pathways based on keywords your pages already rank for in organic search.
• Credit Exclusions for Utility URLs: Redirects (3xx), broken endpoints (4xx/5xx), static resources (CSS, JS, images), and external links linked from your pages do not consume paid crawl credits.

Understanding the Ahrefs Health Score

Every completed audit displays a high-level Health Score between 0 and 100 on the project overview dashboard:

The Health Score represents the percentage of crawled internal URLs that are completely free from technical Errors:

Health Score = (Internal URLs Without Errors / Total Internal URLs) * 100

Ahrefs categorizes detected issues into three distinct severity tiers:

Step 1: Project Setup and Verification

To begin auditing a domain, create a dedicated project within Ahrefs:

1. Log into your account and click + New Project.
2. Choose your setup method: import existing verified domains directly from Google Search Console (recommended for automatic verification) or enter the domain URL manually.
3. If entering manually, verify site ownership via DNS TXT record, HTML file upload, or an HTML meta tag on the homepage. Verifying ownership unlocks full URL viewing in Ahrefs Webmaster Tools (AWT) and permits higher crawl rate thresholds.

Step 2: Configuring Crawl Settings

Fine-tune crawl directives under Crawl settings before starting your audit:

1. Scope and Seed URLs

• Crawl Scope: Choose whether to crawl the entire domain, a specific subfolder (e.g., /blog/), or a specific subdomain.
• Crawl Sources: Select where the crawler discovers URLs. Check both Website links (standard hyperlink traversal) and Sitemaps. Including XML sitemaps ensures the crawler uncovers orphan pages that lack internal links.

2. Robots.txt and Speed Throttling

• Robots.txt Directives: By default, Ahrefs respects robots.txt instructions for AhrefsSiteAudit and general User-agent: * rules. You can adjust this setting if you want the audit to inspect staging environments or disavowed subfolders.
• Crawl Speed: Set the maximum requests per second. For high-powered servers, select 5 to 10 requests per second. For smaller shared hosting environments, set a lower threshold (1 to 2 requests per second) to prevent server overload.

3. JavaScript Rendering and User-Agent

• Execute JavaScript: Toggle this option ON if your site relies on client-side frameworks (such as React, Vue, or Angular) to render navigation links, images, or metadata.
• User-Agent: Set the crawler user-agent to AhrefsSiteAudit Mobile to mirror Google's mobile-first indexing behavior.

Step 3: Reviewing the Core Diagnostic Reports

Once a crawl finishes, navigate through the primary thematic reports available in the left-hand navigation sidebar:

1. Internal Pages and Indexability

The Indexability report displays how search engines process your URL structure. It highlights:

• Pages marked with unintended noindex robots tags.
• Canonical inconsistencies, such as non-self-referencing canonicals, missing canonical tags, or canonical targets pointing to 404 pages.
• Duplicate content clusters identified through algorithmic content similarity analysis.

2. Links and Redirects

The Links and Redirects reports isolate crawl path inefficiencies:

• Broken Inlinks (4xx/5xx): Locates internal links pointing to dead destinations, listing the exact source page and anchor text for quick remediation.
• Redirect Chains & Loops: Flags multi-hop redirects (e.g., URL 1 → URL 2 → URL 3) and endless redirect loops that exhaust crawl budgets.
• Orphan Pages: Identifies URLs found only in your XML sitemap that receive zero internal links from anywhere on your live website.

3. Performance and Core Web Vitals

Integrate your Google PageSpeed Insights API key under project settings to view real-world Core Web Vitals data directly in Ahrefs:

• Reviews Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and Interaction to Next Paint (INP) across your desktop and mobile pages.
• Flags heavy assets, uncompressed imagery, and slow server response times (TTFB).

4. Localization (Hreflang)

For international, multi-lingual domains, the Localization report visualizes language tags in an interactive Hreflang Link Graph:

• Identifies missing return tags (reciprocal confirmation errors).
• Flags invalid ISO language or country codes.
• Detects hreflang URLs pointing to redirecting, non-canonical, or 404 endpoints.

Step 4: Leveraging Automated Internal Link Opportunities

One of Ahrefs Site Audit's most practical features is the Internal link opportunities report. It automates topic clustering without requiring manual keyword mapping:

1. Click Internal link opportunities in the left sidebar.
2. Ahrefs cross-references your organic keyword rankings with words mentioned across your other published articles.
3. The report outputs a clear 3-part recommendation:
   • Source Page: The existing page that mentions a relevant concept in its text.
   • Keyword Mention: The exact phrase in the body copy that could serve as descriptive anchor text.
   • Target Page: The commercial landing page or pillar post that ranks organically for that keyword and would benefit from the internal link.
4. Filter suggestions by target keyword search volume or URL rating to focus on high-priority pages first.

Step 5: Deep-Dive Analysis with Page Explorer and Link Explorer

When predefined issue reports are not enough, use Page Explorer and Link Explorer to slice and filter data using custom rules:

• Page Explorer: Filter your full URL inventory using combinations of over 250 data points (e.g., "Word count < 400" AND "Organic Traffic > 50" AND "HTTP Status = 200" to find thin pages that rank).
• Link Explorer: Inspect internal link distribution at scale. Filter for internal links with generic anchor text like "click here", or isolate all follow links pointing to non-canonical destinations.

Step 6: Segmenting Crawl Data for Targeted Audits

On large websites, viewing sitewide metrics together can obscure specific departmental issues. Use the Segments feature to partition your audit data:

1. Click the Segment button at the top of the Site Audit screen.
2. Create rules based on URL patterns, such as:
   • Blog Section: URL contains /blog/
   • E-Commerce Store: URL contains /shop/ or /products/
   • Regional Subfolders: URL contains /es/ or /ae/
3. Save the segment. You can switch between segments instantly to view isolated Health Scores, error lists, and crawl trends for each site section.

Step 7: Deploying Fixes and Verifying Changes

After your development or content team deploys technical fixes, confirm resolution without waiting for the next scheduled full audit:

1. Navigate to your project dashboard and click + New crawl.
2. Choose Re-crawl project to run a fresh sitewide pass, or select Custom crawl to scan only the URLs flagged with errors in the previous run.
3. Once processing finishes, open the Project history tab to compare crawl logs side-by-side. Confirm that red Error counts decrease and the overall Health Score improves.

Ahrefs Site Audit Technical Checklist

Use the checklist below to verify that your regular audit workflow covers all critical areas:

Maintain Automated Website Health

Ahrefs Site Audit makes technical website monitoring an automated, manageable process. By configuring regular cloud crawls, prioritizing red Errors that directly affect your Health Score, acting on automated internal linking recommendations, and segmenting large catalogs into distinct folders, you keep your site architecture clean, crawl-efficient, and positioned for sustainable organic growth.