Rel canonical checker tool to automatically validate canonical link tags
What is the canonical link checker for
Analyze how rel canonical links influence the indexability of HTML documents
Detect host and protocol changes and canonical links pointing to external URLs
Identify malformed, inacurate, duplicate or missing rel canonical definitions
Debug complex indexation issues that might be the result of long term canonical
How to check rel canonical on website
Control over the rel canonical links on your website is important for indexing and to avoid duplicate content
Our rel canonical validator checks for common errors, missing canonical links and reports the indexability of your documents based on noindex directives and canonicals to other URLs. Correcting canonical mistakes contribute to a better crawling often resulting in a more up to date search index.
Rel canonical tester features
Automated discovery
Rel canonical links are automatically detected by the canonical tool during a crawl, when found in the HTML head and the HTTP header.
Indexability of documents
The indexability of each document is determined by the canonical tag checker trough looking at the canonical target and the meta robots directive, if present.
Exploration of the link graph
Canonical links can easily be explored in our incoming and outgoing link reports for every single URL.
Analyze PageRank tied up in canonicals
Review how much of your internal authority is bound to canonical pages and visualize the impact via PageRank flow.
Check for common rel canonical errors
Incorrect canonical links
Detect malformed or empty canonical links or links that are placed outside the HTML head, by performing a rel canonical check.
Duplicate canonical tags
Find URLs that have more than one canonical element set, and find out if they are conflicting.
Unnecessary documents
Discover documents that can potentially be replaced with a redirect, because the canonical is either a protocol or host change, using our canonical URL checker.
Unreachable documents
Perform a risk check for documents that might get isolated and stop ranking, based on having only long-term canonical links.