Definition
A canonical tag (rel='canonical') is a line of HTML that tells search engines which URL is the preferred version of a page when similar or duplicate versions exist. Google treats it as a strong hint when choosing which URL to index and show in results.
Why it matters for law firms
Law firm sites often create duplicates without realising it, through tracking parameters, www and non-www versions, trailing slashes or printer-friendly pages. Without correct canonicals, ranking signals can be split across versions.
Example
An employment law firm runs Google Ads to its wrongful termination page with tracking parameters. Every page self-references its clean URL as canonical, so only the clean version is indexed.
How to improve it
- Add a self-referencing canonical to every indexable page.
- Point duplicates and parameter URLs to the clean version.
- Make sure canonical URLs return a 200 status and are not redirected.
- Keep canonicals consistent with your sitemap and internal links.
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Technical SEO for Law FirmsRelated terms
Aditya Chauhan
Head of SEO, PageOne Lawyers
Last updated September 26, 2026