Duplicate content happens more often than people think. An online store copies the same description to five colour variants. A writer reuses paragraphs from an old article. A franchise uses one template for twenty city pages with only the city name changed. Search engines then struggle to decide which page to show, and often show none of them well.
What is duplicate content
Duplicate content means large blocks of text that are identical or very similar across pages, either on your own site or across different websites. Google does not usually penalise honest duplication, but it filters duplicates, which means only one version may rank.
How our checker works
The Duplicate Content Checker compares two pieces of content. Each one can be pasted text or a page URL. It shows:
- A similarity percentage based on shared five word phrases
- A verdict such as mostly unique, some overlap or high duplication
- Identical sentences found in both texts
How to use it
- Open the Duplicate Content Checker.
- Paste the first text or enter a URL.
- Paste the second text or enter another URL.
- Click Compare.
Common duplicate content situations
- Product variants: write one strong main description and add unique details per variant, or use a canonical tag.
- City pages: add real local information such as addresses, team members, local projects and customer stories.
- Republished articles: use a canonical tag pointing to the original or rewrite substantially.
- Copied manufacturer text: rewrite in your own words and add your own photos and experience.
How to fix duplicate content
- Rewrite the duplicated sections with fresh information.
- Merge very similar pages into one stronger page and redirect the others.
- Use canonical tags when duplicates must exist for technical reasons. Check them with the Canonical URL Checker.
- Noindex thin utility pages that do not need to rank.
Check against the wider web
This tool compares two specific texts. To see whether your content already exists elsewhere online, use the Plagiarism Checker, which searches the web for your sentences.
A real example
A solar installer created twenty city pages, from Lahore to Hyderabad, all with the same text and only the city name swapped. The checker showed 95 percent similarity between any two pages. None of them ranked. We rewrote each page with real installations in that city, local electricity tariffs, the nearest office and customer photos. Similarity dropped below 20 percent and several city pages started ranking for local solar searches.
A good similarity target
As a rough guide, keep important pages below about 20 percent similarity to each other. Some overlap in navigation text, disclaimers or short boilerplate is normal and harmless. The goal is that each page offers something the others do not.
Duplicate content inside online stores
Stores often create duplicates through filters and sorting, such as the same category sorted by price or colour. These URLs show the same products with different parameters. Use canonical tags pointing to the main category, and avoid linking to filtered URLs from your menus. Check suspicious pairs with this tool to see how similar they really are.
Check before you republish
If you want to republish your article on Medium, LinkedIn or a partner blog, compare the versions first. Either change the republished version enough or ask the partner to add a canonical link to your original, so your website keeps the ranking credit.
Frequently asked questions
Will duplicate content get my site penalised
Usually not, unless it is clearly copied to manipulate rankings. The main problem is that duplicates compete and fail to rank.
What similarity percentage is safe
Below about 20 percent is generally fine for different pages. Shared navigation and boilerplate are normal.
Can I compare a page with a competitor
Yes. It is a quick way to see if someone copied your content.
Compare your content now with the free Duplicate Content Checker.