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SEO Meta tag inspector

Paste the web page HTML or <head> Content, instantly analyze SEO elements such as Title, Meta Description, Open Graph, Twitter Card, JSON-LD, etc., and obtain SEO scores and professional improvement suggestions.

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Frequently Asked Questions

Meta Description (Meta Description) is the website description displayed by search engines in search results. Although not a direct ranking factor, a good Description can significantly increase click-through rate (CTR). The recommended length is between 120 and 158 characters, contains your target keywords and has a natural call to action (CTA). For pages without Description, search engines may automatically extract irrelevant content from the page as a summary.
Canonical (canonical URL) tells search engines which URL is "genuine". Canonical prevents duplicate content issues when the same page is accessible through multiple URLs, ensuring SEO weight is concentrated on a single URL. Lack of Canonical can lead to scattered search engine scores, affecting rankings.
Open Graph (OG) is a Meta tag protocol developed by Facebook, which controls the title, description, image and preview style of web pages when shared on social media. The complete OG tag allows the website to present rich card-style previews on Facebook, LINE, Slack and other platforms, significantly improving the click-through rate of social sharing.
JSON-LD is a structured data format that allows search engines to understand web page content more deeply. Through JSON-LD tags, websites may obtain rich snippets (Rich Snippets), such as star reviews, FAQs, breadcrumbs, etc., that are specially displayed in search results. Google explicitly recommends using JSON-LD as an implementation for structured data.
Meta Keywords are no longer used as a ranking factor by mainstream search engines such as Google and Bing in modern SEO. Google announced in 2009 that it would no longer use the Keywords Meta tag. It is recommended to focus on optimizing the quality of Title and Description.
The recommended Title length is 30 to 60 characters (about 15 to 30 Chinese characters). A Title that is too short cannot fully convey the content of the page, and a Title that is too long may be truncated in search results. The ideal Title should contain the main keywords, brand name, and place the most important information at the beginning.
Twitter Card is a Twitter/X-specific Meta tag protocol that controls the preview style of a website on the Twitter timeline. While Twitter also supports OG tags as a fallback, using dedicated twitter:card, twitter:title, twitter:description, and twitter:image ensures optimal display on Twitter.

SEO knowledge encyclopedia

In-depth understanding of the technical connotation and best practices of SEO Meta tags

Title tag best practices

Title tag (<title>) is the most important element in search results and the cornerstone of SEO. Each page must have a unique Title, which is the primary basis for search engines to determine the theme of the page.

Recommended practices:

  • length control: 30~60 characters (about 15~30 Chinese characters) to avoid being truncated by search results
  • Keyword prefix: Put the most important keywords at the beginning of Title
  • brand ending: Add the brand name at the end of the Title (such as "| ToolHub")
  • unique: Each page should have its own Title to avoid duplication
  • true description: Title must accurately reflect the content of the page to avoid misleading users

Meta Description Best Practices

Although Meta Description is not a direct factor in Google's ranking algorithm, it has a significant impact on the click-through rate (CTR) of search results. An engaging description can make your search results stand out from your competitors.

  • Length recommendations: 120~158 characters to ensure full display in search results
  • Contains keywords: Naturally incorporate target keywords into the description, and search engines will display them in bold
  • call to action: Add CTA (such as "Learn More", "Try Now") to increase click intention
  • unique: Each page should have a unique Description to avoid using the same description for all pages
  • avoid whitespace: When Description is missing, the search engine will retrieve the page content by itself, and the effect is usually poor.

Canonical uses

Canonical URLs are a core tool for solving duplicate content problems. When the same page is accessible through multiple URLs (such as HTTP/HTTPS, www/non-www, trailing slash, tracking parameters, etc.), the Canonical tag tells search engines which URL is "canonical."

Implementation method: in <head> Join in <link rel="canonical" href="https://example.com/正確網址/" />. The classification, filtering, and sorting pages of e-commerce websites especially require Canonical to prevent weight dispersion.

What is Open Graph?

Open Graph (OG) is a Meta tag protocol launched by Facebook in 2010 and has now become an industry standard for community sharing. With the OG tag, you have complete control over the preview appearance of your web page on Facebook, LINE, LinkedIn, Slack, and more.

Required OG tags:

  • og:title — Social sharing title (recommended 40 to 60 characters)
  • og:description — Social sharing description
  • og:image — Share image (recommended 1200×630px, less than 5MB)
  • og:url — Page standard URL
  • og:type — Page type (website, article, etc.)

Getting Started with JSON-LD Structured Data

JSON-LD (JavaScript Object Notation for Linked Data) is the structured data implementation recommended by Google. By adding JSON-LD to your web pages, you can help search engines better understand the page content and display rich snippets in search results.

Common Schema types:

  • Organization — Organization/company information (name, logo, social link)
  • WebSite — Website information (search box, website name)
  • BreadcrumbList — Breadcrumbs (display path in search results)
  • FAQPage — Frequently Asked Questions (expanded Q&A)
  • Article — Article (title, author, publication date)
  • Product — Products (price, inventory, reviews)

Viewport and Robots setting points

The Viewport Meta tag is the basis for mobile friendliness. Use <meta name="viewport" content="width=device-width, initial-scale=1"> Make sure the page scales correctly on mobile phones. Viewport has become a required tag since the implementation of Google's Mobile-First Indexing.

The Robots Meta tag controls the crawling and indexing behavior of search engines:index, follow(Allows indexing and following links),noindex(indexing prohibited),nofollow(No following links allowed). Confirm that important pages are not blocked by noindex and avoid irrelevant pages (such as the admin backend) from being indexed.

SEO Meta Tag Checker Instructions

Free online SEO Meta tag checker tool. Paste HTML to analyze Title, Meta Description, Open Graph, Twitter Card, JSON-LD and other SEO elements, and provide SEO scores and improvement suggestions.

Recommended operating procedures

  1. Confirm the input format, units and necessary fields first to avoid incorrect data being transmitted all the way to the results.
  2. Adjust tool options and read instant tips to cross-check with representative boundary values.
  3. Double-check the results before copying or downloading; for use in formal processes, complete validation in the target environment.

Quality and privacy

This tool executes natively in the browser and does not rely on backend processing. The results will be affected by input quality, browser support and related technical specifications. Please keep the original version and backup of important data.

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