Ecommerce SEO Guides · Diagnostics · 28

Common Ecommerce SEO Mistakes That Kill Rankings

Most ecommerce stores are quietly making the same handful of SEO mistakes, often without realising it. Each one chips away at rankings and sales. This guide lists the most common ecommerce SEO mistakes that kill rankings, why they hurt and exactly how to fix them, so you can check your own store against it.

Updated: May 2026
Written by: Andrew Odgers, MD
Reading time: 6 min
Quick answer

The most damaging ecommerce SEO mistakes are duplicate descriptions, thin category pages, filters creating duplicate URLs, slow speed, a poor mobile experience and weak internal linking. Most are content or technical errors. The good news is that none is bad luck, so every one of them can be found and fixed.

The checklist

The mistakes
that cost you

Content

Top mistakes

Duplicate and thin content lead the list.

Avoidable

Not bad luck

These are errors rather than misfortune.

Fixable

The good news

Each mistake has a clear, simple fix.

The full list

The mistakes that kill rankings

These are the errors we see again and again when auditing ecommerce stores. None is exotic. All are fixable. Read through them and be honest about which your own store might be making.

Using duplicate product descriptions

The most common and most damaging mistake. Publishing the manufacturer description that dozens of rivals also use leaves your pages with nothing unique, so Google has no reason to rank them. The fix is to rewrite descriptions in your own words, starting with your best sellers, focusing on what a buyer genuinely wants to know.

Leaving category pages thin

Category pages target your most valuable buying terms, yet many stores leave them as a bare grid of products with no copy. That gives search engines little to rank. Add a short block of original, useful intro copy that helps shoppers and uses the target term naturally, so the page earns its place for the terms it should own.

Letting filters spawn duplicate URLs

Faceted filters for size, colour and price can create thousands of near-identical URLs, splitting your ranking strength and wasting crawl budget. Left unchecked, this quietly drags a whole store down. Use canonical tags, noindex rules or controlled parameters so Google focuses on your main category pages rather than every filtered variation of them.

Ignoring page speed

Slow pages cost rankings and sales at the same time. Heavy images, bloated apps and weak hosting are the usual culprits. Since page speed is a ranking factor and shoppers abandon slow stores, leaving it unaddressed is a costly oversight. Measuring and improving speed, starting with images, is one of the highest-impact fixes available.

Deleting old product pages

When a product is discontinued, many stores simply delete the page. That throws away the authority and traffic it had earned. Instead, keep the page live with alternatives suggested. Alternatively redirect it to a relevant category or replacement. Preserving that authority protects rankings you have already worked hard to build.

Neglecting the mobile experience

Google ranks your site on its mobile version, while most shoppers are on phones, yet plenty of stores still treat mobile as an afterthought. A slow, cramped or fiddly mobile experience harms rankings everywhere and loses sales. Treating mobile as the main version, not the secondary one, is now essential rather than optional.

Weak internal linking and structure

A store with buried pages, orphan products and little internal linking makes it hard for Google to crawl the site and for authority to flow to the pages that matter. Build a clean, shallow structure and link generously between related categories and products, so ranking strength reaches your money pages instead of leaking away.

The key truths

Three things about
these mistakes

01 · Content

Content errors top the list

Duplicate and thin content are the most common and most damaging mistakes. Fix these first for the biggest gains.

02 · Avoidable

None is bad luck

Every mistake here is a specific, avoidable error rather than misfortune. They happen by oversight, not by chance.

03 · Fixable

All have clear fixes

The good news is that each mistake has a straightforward fix. Working through them often reveals several quick wins.

The mistakes

The mistakes that
kill rankings

Four groups of errors that quietly hold stores back.

Four areas where stores go wrong
Content
1Duplicate descriptions
2Thin category pages
3Keyword stuffing
4No content strategy
Technical
1Filter duplicates
2Slow pages
3No schema
4Crawl errors
Structure
1Buried pages
2Deleted URLs
3Weak internal links
4Messy URLs
Experience
1Poor mobile
2Clunky checkout
3Intrusive popups
4Hard navigation
Most ranking-killing mistakes fall into four areas: content, technical, structure and experience. The good news is that none of them is bad luck. Each is a specific, avoidable error with a clear fix. Work through your store against this list and you will likely find several easy wins waiting.
The worst offenders

The biggest
mistakes

Duplicate descriptionsManufacturer copy everyone else uses too.
Thin category pagesA bare grid with no real content.
Filter duplicatesThousands of near-identical URLs.
Ignoring mobileWhere Google ranks you first.
Done for you

Making any of these?

Most stores are making at least a few of these mistakes without realising it. Our ecommerce service starts from £350 a month. A free audit will spot every one your store is making and show you how to fix them.

Wrong vs right

Common mistakes vs
the fixes

Do this instead

The fixes

  • Write original product descriptions
  • Add useful category copy
  • Canonicalise filtered URLs
  • Optimise speed and mobile
  • Keep and redirect old pages
Common mistakes

What kills rankings

  • Copied manufacturer descriptions
  • Bare, thin category pages
  • Filters creating duplicates
  • Slow, mobile-hostile pages
  • Deleting pages that ranked
Part of: This is guide 28 in our full ecommerce SEO library, the common mistakes checklist.
SEO Guides for Ecommerce Businesses →

Where to go next

These mistakes are why so many stores struggle, explored more broadly in Why Ecommerce Sites Fail at SEO. If you used to rank and slipped, Why Ecommerce Sites Lose Rankings covers that case. And once you have spotted your mistakes, How to Improve Ecommerce SEO shows you how to put them right.

Every guide here sits inside our SEO Guides for Ecommerce Businesses hub, so you can check the whole store. When you want every mistake found and fixed, our Ecommerce SEO Services page explains how we do it for stores across the UK.

Free, no obligation

Find the mistakes
costing you sales.

We will audit your store and show you every SEO mistake it is making and how to fix them, free. No generic report, no sales pitch. Ecommerce SEO from £350 per month.

Frequently asked

Common ecommerce SEO mistakes

What are the most common ecommerce SEO mistakes?
The most common are duplicate product descriptions, thin category pages, filters creating duplicate URLs, slow page speed, neglecting mobile, deleting old product pages and weak internal linking. Most are content or technical errors. The good news is that every one of them is avoidable and fixable.
What is the biggest ecommerce SEO mistake?
Duplicate content is the most damaging, especially using the manufacturer product description that dozens of other stores also publish. With nothing unique to offer, your pages have no reason to rank. Rewriting that content in your own words is usually the single most valuable fix.
Why is deleting old product pages a mistake?
Because a page that ranked has earned authority, so deleting it throws that away along with any traffic it brought. For discontinued products, it is far better to keep the page, suggest alternatives or redirect it to a relevant page, so the authority is preserved rather than lost.
How do I avoid ecommerce SEO mistakes?
Work through your store against the common mistakes: check for duplicate content, thin pages, filter duplicates, speed and mobile issues, deleted pages and weak linking. Fixing these one by one removes the things most likely to be holding your rankings back. An audit makes them easy to spot.