Website SEO comprehensive health check engine

Website SEO Audit

Paste the complete HTML to proceed Comprehensive SEO health check. analysis <head> with <body> Structure, covering Meta tag, Heading level, image ALT, link quality, Accessibility, structured data and HTML quality, provides four major aspects of scoring and complete improvement suggestions.

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Supports full HTML, only <body> or only <head> content.

SEO Health Score Dashboard

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Meta Score

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Content Score

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Accessibility Score

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Structure Score

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Frequently Asked Questions

Website SEO Audit (Website SEO Comprehensive Health Check) is a systematic web SEO quality assessment process. Check with only <head> Different from the Meta Checker of tags, SEO Audit will conduct in-depth analysis <body> Structure, including Heading level correctness, image ALT attributes, link quality, web page accessibility (Accessibility), structured data (Schema.org) completeness and HTML file quality, ultimately produces four major quantified scores and specific improvement suggestions.

Heading (H1 ~ H6) is an important signal for search engines to understand the hierarchical structure of web page content. The correct Heading level (such as H1 → H2 → H3, without skipping levels) can help search engines determine the primary and secondary relationship of content. Where H1 is the most important title of the page, each page should have only one H1 and should contain the main keyword. Skipping levels (such as jumping directly from H1 to H3) or missing an H1 can have a negative impact on SEO.

Yes, image ALT attributes are an important part of SEO. It has three major functions: (1) It helps search engines understand the content of images and has the opportunity to be ranked in image searches; (2) When the image cannot be loaded, it displays alternative text descriptions; (3) It provides voice reading content for visually impaired users to improve the accessibility of web pages. Recommended for each <img> Use descriptive ALTs, but avoid keyword stuffing.

Google officials have made it clear that web accessibility is not a direct ranking signal. However, good Accessibility practices such as aria-label, form tags, Lang attributes, Iframe Title, etc.) can significantly improve user experience (UX), and UX indicators (such as dwell time, bounce rate, interaction rate) indirectly affect SEO performance. In addition, adhering to accessibility standards is also an important part of responsive web design.

Structured data (Schema.org) itself is not a direct ranking factor, but it allows web pages to present rich snippets (Rich Snippets) in search results, such as FAQ expandable questions and answers, Breadcrumb breadcrumb navigation, Article article cards, Product product prices and star reviews, etc. These visual enhancements can significantly increase the click-through rate (CTR) of search results and indirectly promote SEO results. Google explicitly recommends using the JSON-LD format for implementing structured data.

when using target="_blank" When opening an external link, you should add rel="noopener" or rel="noreferrer". This is not only a security consideration (preventing newly opened pages from passing window.opener access the original page) and is consistent with Google's best practice recommendations. Although this has no direct impact on rankings, it is related to website security and user trust.

HTML lang attributes (such as <html lang="zh-TW">) tells search engines what language the web page content is in. This is critical for SEO on multilingual sites, helping search engines serve your content to users in the correct language. In addition, the Lang attribute is also a basic requirement for web accessibility. The screen reader will switch the correct speech reading engine based on the lang attribute.

SEO knowledge encyclopedia

In-depth understanding of the technical connotation and best practices of comprehensive website SEO health inspection

The Complete Guide to Website SEO Health Check

Website SEO Audit (SEO Audit) is a systematic inspection process to ensure that the website maintains optimal performance in search engines. A complete SEO Audit should cover the following aspects:

Technical SEO: Check basic settings such as HTML structure, Doctype, Viewport, Charset, Robots, Canonical, etc.
Meta tag: Verify the integrity and quality of Title, Description, Open Graph, and Twitter Card
Content structure: Analyze Heading level, image ALT, internal/external link quality
Accessibility: Ensure web page accessibility, including Lang attributes, ARIA tags, form tags, etc.
structured data: Confirm whether the Schema.org markup correctly contains FAQ, Article, Breadcrumb, Organization, etc. types

It is recommended to perform a complete SEO Audit at least once a quarter and immediately after a major website redesign (such as redesign, adding a large number of pages, adjusting the URL structure) to ensure that SEO authority is not affected.

Heading best practices

Heading tags (H1~H6) are the skeleton of web content. Correct use is crucial to SEO and user experience:

One H1 per page: H1 is the main title of the page and should echo the Title tag to avoid duplication.
No step skipping: Heading levels should increase sequentially (H1 → H2 → H3) to avoid H1 jumping directly to H3
Contains keywords: Incorporate target keywords naturally into the Heading, but don’t stuff it
Keep the hierarchy simple: Avoid excessively deep Heading levels (exceeding H4 usually indicates that the content structure needs to be restructured)
Don't skip H1: Pages without H1 will make it difficult for search engines to determine the topic of the page.

The Complete Guide to Image SEO

Image SEO is an easily overlooked but potentially huge part of your overall SEO strategy. Optimizing images not only improves the user experience, but also brings traffic to your website from image searches:

ALT attribute: Each image should have descriptive ALT text to help search engines understand the content of the image.
Lazy Loading: use loading="lazy" Delay loading of non-first-screen images to improve page loading speed
File name: Use a descriptive file name (such as "seo-audit-guide.jpg" instead of "IMG_001.jpg")
File size: Compressed images stay under 100KB, using WebP format for the best quality/size ratio
Responsive images: use srcset Provide appropriately sized images for different devices

The relationship between Accessibility and SEO

Although Web Accessibility is not a direct SEO ranking factor, it has many overlapping practice areas with SEO:

HTMLLang attribute: Helps search engines and screen readers correctly interpret the language of web pages
Image ALT Text: Serving both SEO and visually impaired users
Heading structure: Good hierarchy improves both SEO and screen reader navigation
form tag: correct <label> Improve form usability and accessibility
button text: All interactive elements should have identifiable text, avoid using just icons
Iframe Title: Embedded content should provide a title attribute to describe the purpose of the embedded content.

Think of Accessibility as an extension of SEO, not only to serve more users, but also to build clearer and more structured web content - which is what search engines prefer.

The importance of structured data

Structured Data uses the Schema.org vocabulary to tell search engines the specific meaning of web page content in a unified format:

FAQ Schema: Let frequently asked questions appear as expandable cards in search results, greatly improving visibility.
Article Schema: Give your articles better visibility in Google News and Discover
Breadcrumb Schema: Show breadcrumbs in search results
Organization Schema: Provide company information, logo, and social media links
Product Schema: Display product price, inventory, rating stars, etc.
WebSite Schema: Make the site name and site search appear in search results

When implementing structured data, it is recommended to use the JSON-LD format (recommended by Google) and pass Google Rich Results Test Verify format correctness.

Link quality and SEO

Links are one of the three pillars of SEO. When checking link quality, please note:

internal link: Establish the relevance and weight transfer of website content through internal links to ensure that important pages have enough internal links to point to.
external link: Linking to high-authority external sites can enhance the credibility of your content, but should be used rel="noopener" ensure safety
Nofollow: Use of sponsored links, user-generated content, etc. rel="nofollow" or rel="ugc", to avoid passing weight to uncontrollable links
link text: Use descriptive anchor text (Anchor Text) to avoid meaningless text such as "click here" and "more"