Canonical URL Checker - Inspect Canonical Link
Quick, Easy & Free Online SEO Tools to Inspect Canonical Tag
Online Canonical Link Checker Tool for Inspection of Canonical Link
Canonical HTML Tag is a communicating way to Search Engine to inform Consolidate Duplicate URLs with Canonicals. Canonical Tag of a web page tells Search engine which is "preferred" or "Original" Link and Prevent duplicate content issues in search engine optimization/SEO.
If the current page URL and Canonical URL are same, it means the current page is preferred & Original webpage for Search Engine Indexing & It should not exclude from Indexing.