What is Canonical URL?

Canonical URL — Thuật ngữ

An HTML element specifying the preferred version of a page when duplicate or similar content exists at multiple URLs.

Chi tiết kỹ thuật

XML canonical urls follow the sitemaps.org protocol, listing URLs with optional lastmod, changefreq, and priority attributes. A single sitemap is limited to 50,000 URLs or 50 MB; larger sites use a sitemap index file that references multiple sitemaps. Google largely ignores changefreq and priority, relying instead on its own crawl scheduling. Sitemap submission through Google Search Console or a robots.txt Sitemap: directive ensures discovery of pages that might not be found through link crawling.

Ví dụ

```xml
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://peasytools.com/tools/pdf-merge/</loc>
    <lastmod>2026-03-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
</urlset>
```

Định dạng liên quan

.html

Công cụ liên quan

S SERP Preview O OG Tag Debugger H Heading Analyzer K Keyword Density Analyzer R Readability Score X XML Sitemap Generator S Schema.org Generator L Link Extractor C Canonical Tag Checker M Mã Hóa/Giải Mã URL R Robots.txt Analyzer S Structured Data Validator W Word Count & SEO Grade M Meta Length Checker U URL Slug Generator K Keyword Density Analyzer

Thuật ngữ liên quan

URL Encoding SERP Hreflang Schema Markup JSON-LD Rich Snippet Crawl Budget Robots.txt Sitemap XML Meta Description Title Tag Alt Text Backlink Internal Linking Anchor Text Core Web Vitals LCP CLS IndexNow Noindex 301 Redirect Keyword Density Open Graph Breadcrumb E-E-A-T YMYL Core Update Helpful Content Topical Authority Entity SEO Knowledge Panel Featured Snippet People Also Ask Local Pack Rendering Budget Edge SEO Log File Analysis INP Page Experience TTFB Domain Authority Long-Tail Keyword Nofollow Duplicate Content Pagination SEO Knowledge Graph Orphan Page Search Intent Passage Ranking