Canonical URL Checker

A canonical URL tells search engines which version of a page is the primary one. This tool checks a list of URLs for common canonical-tag issues: missing protocol, plain HTTP instead of HTTPS, and query strings that may need review. It does not verify whether a live page actually serves a canonical tag.when similar content is reachable through multiple URLs. The most common mistake is serving pages over both HTTP and HTTPS — the same content at two addresses, which splits ranking signals.

This tool checks the URLs you paste and flags any that use http:// instead of https://, so you can fix them before they cause duplicate-content confusion. URLs already using HTTPS pass the check.

It is a quick formatting audit for the canonical issue that matters most; it does not crawl your site or verify how your server responds.

The tool reads the URLs you paste — one per line — and checks each for its scheme. URLs starting with http:// are flagged as needing HTTPS; URLs using https:// are reported as OK.

The check is a simple local scan of the text you enter. No request is made to any server, and nothing is retained after you close the tab.

The output lists each URL with its status, so you can fix the flagged ones.

A canonical URL is declared with a canonical link element in a page's head — or via HTTP headers — to tell search engines which URL is the preferred version. When the same content is reachable at multiple addresses, the canonical signal consolidates the ranking signals to one URL.

The most common canonical problem is protocol duplication: serving a site over both HTTP and HTTPS creates two URLs for every page, splitting signals and risking mixed-content issues. The standard fix is a permanent redirect from HTTP to HTTPS plus consistent canonical declarations pointing at the HTTPS versions.

Canonicals are a hint to search engines, not a command — they are respected by the major engines in the vast majority of cases, but genuinely identical content on separate domains still benefits from redirects and consolidated hosting.