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On-Page SEO

Canonical Tag Checker

Check for the presence of the Canonical Tag on your page.

Canonical Tag Checker

About this tool

Verify that your webpage has a properly configured canonical tag to prevent duplicate content issues. The canonical tag tells search engines which version of a page is the primary one.

Noindex Tag Test

Check if a 'Noindex' tag is present on your webpage.

URL checkOpen Hreflang Checker

Identify alternative language tags on your pages.

URL checkOpen Title Tag Checker

Optimize your HTML Title Tags for SEO.

URL checkOpen
No signup, no catch

What the free tools actually do

Seven of them run in the browser and ask for nothing. The eighth asks for a domain and an email, because it has to send you a report.

  • best AI visibility trackerDaily
    ChatGPT
    Gemini
    Perplexity
    Claude

    A real check, right now. Four models asked your question, with the answers they gave back.

  • Prompt ideas
    what is AEO2.4k
    best AEO tools1.1k
    AEO vs SEO860

    Prompt research, free. A sample of the ideas the paid research page ranks.

  • A crawler that only reads. It fetches your pages the way an AI crawler would and never writes.

  • Generators
    llms.txtGenerate
    FAQ schemaGenerate
    Article schemaGenerate

    Copy-paste output. llms.txt and schema markup you can paste straight into the page.

  • 30sto a visibility report on your domain

    Use it in the pitch. Screenshot it, export it. White-label and weekly is the paid plan.

Everything you're wondering

Or ask us anything at hello@zerorank.ai

What is a canonical tag?

A canonical tag (rel="canonical") is an HTML element that tells search engines which URL is the preferred version of a page. It consolidates ranking signals and prevents duplicate content penalties.

How do I fix duplicate content with canonical tags?

Add a <link rel="canonical" href="https://preferred-url"> tag in the <head> of each duplicate page, pointing to the URL you want indexed. This tells search engines to credit all ranking signals to that preferred version.