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Publishing another page feels like progress. There is a new URL, something to put on the content calendar, and another deliverable somebody can point at. Checking whether the site already answers the same question is a less exciting job.
It is also a useful way to avoid creating work you will eventually have to undo.
Duplicate content and overlapping pages can leave a site with several versions of an answer and no clear decision about which one a visitor should use. Start by working out why those pages exist.
Similar subjects can deserve separate pages
An SEO audit service, an audit checklist and a technical guide can all belong on the same website. One helps somebody hire a service. Another helps them work through a task. Another explains a particular problem in depth.
Sharing the words “SEO audit” doesn’t automatically make those pages competitors you must merge. Look at the purpose, the search queries and the result the visitor needs. The problem is more likely to be several pages trying to perform the same job with slightly different wording.
When that happens, compare what each page contributes. One might have better examples, another a clearer explanation, another useful links that you don’t want to lose. Decide whether combining them would give somebody a better destination. Preserve the useful material instead of deleting a page because a tool put it in a duplicate-content report.
Also distinguish repeated passages from wholly redundant pages. A standard delivery policy appearing on multiple product pages does not make the products identical. Technical SEO becomes much less useful when it starts treating every repetition as a catastrophe.
Some duplicates come from the software
Tracking parameters, sorting options and alternative URL paths can expose substantially the same content at several addresses. The site may need those addresses for practical reasons, even though you would prefer one version to represent the content in search.
A canonical annotation gives Google a preferred URL for duplicate or very similar pages. Google describes it as a strong signal, and recommends keeping internal links and other canonical signals consistent. It may still select a different canonical. Google’s canonical guidance explains the methods and their limits.
That is a specific job. Pointing every awkward page at the homepage is not an alternative to deciding what the page should do. The preferred page needs to make sense as the representative of that content.
A normal address and a version with campaign-tracking parameters can lead to exactly the same page. That gives you a clear reason to choose a canonical URL. Decide which version you want search engines to use, then keep your links consistent with it.
Retiring a page is a different decision
If a redundant page is no longer needed and another page properly replaces it, a permanent redirect may be appropriate. A visitor using the old address then reaches the replacement. If the alternative page needs to remain available, canonicalisation may fit better.
Removing a page from search is another separate decision. An indexing directive and a canonical preference don’t do the same thing, so choose according to the outcome you need. This is where asking what should happen to a real visitor is often more clarifying than opening another settings panel.
Before making a change, write down the old URL, the intended destination and what useful content you are preserving. Afterwards, follow the old links and inspect the result. A technically configured redirect that lands on an irrelevant page has not completed the editorial work.
Make the next article earn its address
Before adding the next item to the publishing calendar, search your own site. Read what is already there. You might need a new page, a substantial update, a better title or a useful link from an existing article.
All of those are real work. Only one creates a new URL, and that doesn’t automatically make it the best choice.
You can buy The Big Book of SEO on Ephemera for the fuller guide to duplicates, redirects and site structure. Before writing the next page, though, check whether the answer is already on your website and needs a better home.