All SEO Guides
Dive deep into each of our SEO checks to understand what they mean, why they are important, and how to improve your website's performance. Click on any check for a detailed guide.
Meta & Content
Meta Title
Checks for the presence, length, and content of the meta title tag.
Meta Description
Evaluates the meta description for its presence, length, and relevance.
H1 Heading
Verifies the presence and uniqueness of the H1 heading tag.
H2 Headings
Checks for the presence and structure of H2 heading tags.
Image ALT Attributes
Ensures all images have descriptive ALT attributes for accessibility and SEO.
Most Common Keywords
Analyzes the page content to identify the most frequently used keywords.
Keywords Usage
Checks if the main keywords are present in the title, description, and headings.
Keywords Cloud
Visualizes the most frequent keywords on the page in a tag cloud.
Word Count
Counts the total number of words on the page.
Technical SEO
Robots.txt
Validates the presence and accessibility of the robots.txt file.
Sitemap
Confirms the presence of a sitemap in robots.txt.
Image Sitemap
Checks for the presence of an image sitemap to improve image indexing.
Noindex Tag
Checks for noindex meta tags or headers that might block search engines.
Broken Links
Scans the page for any broken internal or external links.
WWW Resolve
Ensures the domain consistently resolves to one version (WWW or non-WWW).
Canonical URL
Verifies the implementation of canonical tags to prevent duplicate content.
Deprecated HTML Tags
Scans for outdated HTML tags that are no longer supported.
Favicon
Checks if a favicon is present and correctly configured.
SEO Friendly URL
Checks if the URL is user-friendly and optimized for search engines.
Charset Declaration
Checks for a declared character set (e.g., UTF-8).
Flash Test
Detects the use of Adobe Flash, which is obsolete and unsupported.
Nested Tables
Checks for nested tables, which should not be used for layout.
Frameset Test
Checks for the use of framesets, which are outdated and bad for SEO.
Doctype Test
Verifies that the page has a modern HTML doctype declaration.
Accessibility
Semantic HTML Structure
Checks for proper use of semantic tags like <main>, <nav>, etc.
Heading Structure
Ensures headings (<h1>-<h6>) are logically ordered and not skipping levels.
Form Labels
Ensures all form inputs have associated labels for accessibility.
Keyboard Navigation
Checks if all interactive elements are reachable via the Tab key.
Color Contrast
Checks for sufficient contrast between text and background colors.
Descriptive Link Text
Checks that link text is descriptive and not generic like "click here".
ARIA Usage
Checks for potentially problematic use of ARIA roles and attributes.
Document Language
Checks that the document has a language attribute defined (e.g., <html lang="en">).
Accessible Tables
Checks if data tables use headers (<th>) and captions.
Multimedia Accessibility
Checks for the presence of captions or transcripts for <video> and <audio> elements.
Focus Visibility
Checks that focus styles have not been improperly removed.
Skip Links
Checks for the presence of a "Skip to main content" link for keyboard users.
Page Zoom and Scaling
Checks if the page is readable and functional when zoomed to 200%.
Accessible CAPTCHA
Checks for the use of CAPTCHAs, which can be an accessibility barrier.
Performance & Optimization
Responsive Images
Checks if images use responsive techniques like srcset.
Image Aspect Ratio
Checks if images have width and height attributes to prevent layout shift.
JavaScript Errors
Checks for JavaScript errors in the browser console. (Note: In-dev check)
HTML Page Size
Measures the total size of the HTML document.
HTML Compression
Checks if GZIP or Brotli compression is enabled.
Inline CSS
Detects the use of inline CSS, which can affect performance.
Modern Image Formats
Checks if images are served in modern formats like WebP for better compression and quality.
Time To First Byte (TTFB)
Measures the server's response time to the first byte.
First Contentful Paint (FCP)
Measures the time until the first content is painted on the screen.
Largest Contentful Paint (LCP)
Measures the time until the largest content element is painted.
Cumulative Layout Shift (CLS)
Measures visual stability to ensure a smooth user experience.
Page Objects
Counts the number of page resources (CSS, JS, images).
CDN Usage
Checks if the site appears to be using a Content Delivery Network.
Image Metadata
Checks if images contain excessive EXIF metadata.
JavaScript Minification
Checks if JavaScript files are minified to reduce their size.
CSS Minification
Checks if CSS files are minified to reduce their size.
Render-Blocking Resources
Identifies scripts and stylesheets that can block page rendering.
Mobile/UX
Security, Privacy & Authority
SSL Certificate Test
Verifies the validity and configuration of the SSL certificate.
HTTPS Encryption
Checks if the site is secured with a valid SSL certificate.
HTTPS Redirect
Ensures that HTTP traffic is automatically redirected to HTTPS.
Mixed Content
Checks for insecure (HTTP) resources on a secure (HTTPS) page.
HTTP/2 Test
Checks if the server supports the modern HTTP/2 protocol for better performance.
HSTS Test
Checks for the presence of the Strict-Transport-Security header.
Server Signature
Checks for exposed server version headers which can be a security risk.
Directory Browsing
Checks if directory listing is disabled on the server.
Email Privacy
Detects plain text email addresses on the page.
Unsafe Cross-Origin Links
Checks for target="_blank" links without rel="noopener".
Social Media Tags
Checks for Open Graph and Twitter Card meta tags for social sharing.
Analytics Test
Checks for the presence of common analytics tracking scripts.
Privacy Policy & Terms Links
Checks for links to privacy policy, terms of service, and other legal pages.
Advanced SEO
Structured Data
Detects Schema.org JSON-LD structured data.
Custom 404 Page
Checks if the website has a custom 404 error page.
Nofollow Tag Test
Checks for the presence of a nofollow meta tag.
Disallow Directive Test
Checks for disallowed paths in the robots.txt file.
Meta Refresh Test
Checks for meta refresh tags which can be confusing for users and search engines.
SPF Records Test
Checks if the domain has an SPF record to prevent email spoofing.
Ads.txt Validation
Checks for the presence of an ads.txt file for advertising transparency.
Heatmap & Session Replay Analytics
Checks for the presence of heatmap and session replay tools like Clarity or Hotjar.