Plagiarism Checkers: Best Tools and How They Work


Recent Posts

What is a Plagiarism Checker?

Plagiarism checker is a tool or a online service detecting a text being used by someone else or not basically. It compares your text with database of documents from online sources and if it spot a match or find pattern in your writing, it label that text as plagiarized.

In the recent years, rise of Ai (Artificial Intelligence) writers created a new challenge, it used to be fairly easy to spot a content with plagiarism but Ai writers like ChatGPT or Gemini became super intelligent and for the plagiarism detectors having problem to spot those patterns after those developments in tech.

Plagiarism Checkers: Best Tools and How They Work

So we gonna discuss Plagiarism on SEO specifically when it comes to scientific plagiarism that`s another topic.

So for SEO space Ai writers changed everything starting from content creation to content marketing reason why generating content took couple of second but it brings a question to my mind. Content being generated with Ai is really helpful? clearly not so much, cause Ai writers good at understanding the task and generating response but yet contextual logic is still missing in Ai writers.

Ai writers uses LLM (Large Language Models) and those models trained with data found online, so generating a new idea or creating something from a scratch or find a pattern between subjects people are still good compare to operating Ai`s today.

According to our research (Page Labs) we found out couple of things how Search Engines Detects Ai written content.

Here are couple of patterns Ai writers consistently repeats

Same Word structure

Same Contextual Structure

Using time and place descriptions with same sentence structure (third person singular)

Pronouns mostly starts on beginning of a sentence.

Lack of actual information (skipping a key information constantly and keep try to explain but not)

Do Plagiarism Checkers Actually Works?

Short answer is definitely YES!

Plagiarism checkers look at your text and compare it with a big database of sources (mostly web UGC content) to find copied content. But how well they work can depend on how big their database (crawled pages) is and how smart their software (detection algorithm) is. So, while they’re usually good at catching plagiarism, how accurate they are can changes.

How Plagiarism Checkers Works?

Plagiarism checkers catch the plagiarized text with these steps:

  1. Text Analysis: Breaking down the text into smaller chunks or phrases like Google does for search Algorithm (Like did you mean feature you saw on your searches)
  2. Database Comparison: Comparing these chunks against a big database of existing documents (Scanning Web), academic papers, websites, and other sources and lately UGC (User Generated Content) since we talking about SEO effects.
  3. Algorithm Matching: Using algorithms to identify similar phrases, sentences, or paragraphs or word structures or the actual key information.

    You probably asking this: Every question have one answer? that is correct but describing that or giving answer to that question is always unique and different from each other. Imagine two persons describing a scenery imagine how they start from which object or piece or how they make an argument will be completely different right? It goes for Search engines also the same, if the search engines spots a pattern or same way to give an key information it spots and devalues your content.

  4. Reporting: Finding those patterns and getting a percentage of text in question (Like %67 characters detected with same pattern)

What is the Best Plagiarism Checker?

What makes Spin Cloud different from other Plagiarism Checker Services?

Its connected with

Page Detector (Proprietary Engine)



OpenAi (ChatGPT starting from 3.0 to latest GPT-4o) 

Writer Ai

All together to give you an actual average for best detection possible.
Plagiarism Checkers: Best Tools and How They WorkAlso Spin Cloud equipped with Ai Spinning Service Integrated which means if the service detects Ai patterns it also capable to eliminate and re-write the text for you.Access Spin Cloud Plagiarism Checker from here

Plagiarism Checker Features Free/Paid User-Friendly Best For Score
Spin Cloud Deep search capabilities, Connected to Proprietary Page Detector and four others, Detailed reports Paid – Free Trial ⭐⭐⭐⭐⭐ Best overall, especially for comprehensive checks 95%
Turnitin Comprehensive database, Detailed reports Paid ⭐⭐⭐⭐ Academic settings 90%
Grammarly Plagiarism check, Grammar and spell check Paid – Free Trial ⭐⭐⭐⭐⭐ Writing assistance 88%
Copyscape Web content checking Paid ⭐⭐⭐⭐ Web content verification 85%
Quetext Deep search capabilities, User-friendly Paid ⭐⭐⭐⭐ In-depth content analysis 87%
Unicheck Detailed reports, Integration with educational platforms (Specially good for Scientific Plagiarism Checks) Paid ⭐⭐⭐⭐ Educational platforms 86%
GPTZero Advanced AI detection Paid – Free Trial ⭐⭐⭐⭐ AI-generated content 83%
Gemini Comprehensive checks Paid ⭐⭐⭐⭐ Versatile usage 84%
OpenAi AI-based detection Paid ⭐⭐⭐⭐⭐ Cutting-edge technology 89%
Writer Writing and plagiarism check Paid ⭐⭐⭐⭐⭐ Comprehensive writing tools 87%

What are the Best Free Plagiarism Checkers?

Several free plagiarism checkers are available, though they may have limitations in terms of database size and depth of search. Some popular free options includes:

  1. Spin Cloud comes first with up to 3000 character daily comprehensive check plus Ai Article Spinner service integrated.
  2. Second is GPTZero limited 5000 character
  3. Third is Grammarly also have a good Ai engine and able to correct grammar mistakes.


How to Beat or Cheat a Plagiarism Checker

While unethical (Considered as Black Hat SEO) and not recommended for SEO, some methods people might attempt such as these ones:

  • Paraphrasing: When you rewrite something using your own words to avoid directly copying this method also being heavily used by content writers to speed up their writing process it`s acceptable when using Ai for editing purposes but generating answers with Ai mostly ends up in wrong direction.
  • Using Synonyms: Swapping words for others that mean almost the same to slightly change the text, this also makes Ai detection algorithms or Plagiarism Checkers hard to detect but again if the word structure is the same changing synonyms or using similar meaning words won`t help much. But if you change
  • Rearranging Sentences: Changing the order of sentences or paragraphs is the best way to cheat Plagiarism Checkers to be exact cause word structure additional to Demonstrative Adjectives also changes the structure of the word.
  • Using Multiple Sources: Mixing information from different places to avoid copying large sections of text. This method used to work but recently Ai`s using larger LLM`s so databases are quite similar to each other like Nvidia`s latest Generative Ai Database uses pre-trained LLM`s and much more so it`s not just the text became easy to detect, images and videos also even CAD designs can detectable easily.But again algorithms after 2024 became so advanced it`s kinda getting impossible to avoid detection.


What are the Bulk Plagiarism Checkers?

Services Bulk Features
Turnitin Academic plagiarism detection
Grammarly Business Business writing improvement
Copyscape Premium Online content protection
Plagscan Thorough plagiarism detection
Small SEO Tools Plagiarism Checker Online content verification
Quetext Simple plagiarism detection
DupliChecker Free text checks
Unicheck Educational plagiarism detection
Plagiarism Checker X Comprehensive checks
PaperRater Grammar and plagiarism checking
Spin Cloud Plagiarism Checks & Content Spinning Tool

Plagiarism Checkers: Best Tools and How They Work

Can plagiarism checkers detect self-plagiarism?

Yes!, they can find if you’ve used your own work again without saying so 🙂

Do plagiarism checkers store or share my content?

No, good ones don’t keep your writing after checking it cause they using the Web Sources anyhow also in case of your content is Human Written

Is using a plagiarism checker legal?

Yes, it’s okay and smart to use one to check your work for copying. In fact for many jobs Plagiarism Checks are mandatory.

Can plagiarism checkers detect paraphrasing?

Yes, they can see if you’ve rewritten something in your own words.

Why should I use a plagiarism checker?

It makes sure your writing is original and not copied, which is important for school and avoiding problems with using others’ work and most importantly for SEO became vital! Especially Google Ai Overviews Update will change many things for SEO space.



Eren Atagiloglu

Eren Atagiloglu

As the Chief Content Officer at Page Ads, I oversee our content strategy and execution. I love telling stories and using data to boost our brand's visibility and engagement. My goal is to drive business growth and strengthen our market presence with innovative content.

Leave a Reply

Your email address will not be published. Required fields are marked *

Sign up for our Newsletter

Click edit button to change this text. Lorem ipsum dolor sit amet, consectetur adipiscing elit

Do you want to know how to increase your traffic and get
Subscribe and download free ebook now!
Thank You!
Download E-Book