Filters help shoppers but can create thousands of duplicate URLs. Here is how to keep the useful ones and control the rest.
The problem
Every combination of size, colour, price and brand can create a new URL. Search engines waste crawl time on them, and authority is split across near-duplicates.
Decide which filters deserve pages
If people search for a filtered set, such as 'black linen dresses', it may deserve an indexable category page with its own copy.
Control the rest
Use canonical tags, robots rules or parameter handling so low-value combinations are not indexed or crawled excessively.
Link the winners
Link to valuable filtered categories from navigation and related categories so they gain authority.
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