Plagiarism Detector

Check the originality of your content before publication and detect plagiarism. The tool analyzes the similarity of your text to content available on the Internet and identifies potential sources of borrowings.

What does the Plagiarism Checker & Detector tool do?

Plagiarism Checker & Detector is a practical plagiarism detector for SEO and content marketing. You paste your text for analysis. The tool selects representative sentence samples. It then checks them in Google search results. Afterward, it analyzes the content of the found pages and calculates the similarity percentage based on sentence matches.

The results are presented in a clear layout. You receive a list of sources with a similarity percentage. You'll also see a most frequent matches section, which shows samples with the highest number of hits. The text preview highlights exactly matched and highly similar fragments. This makes it easier to assess the risk of duplicate content and keyword cannibalization.

• Analysis of sentence samples in Google search results.
• Verification of content directly on websites.
• List of sources with similarity percentage.
• Most frequent matches section with number of hits.
• Text preview with highlighted matched fragments.
• Export results to a CSV file for reporting and archiving.

How does the Plagiarism Checker & Detector tool help SEO specialists and website owners?

The tool allows you to quickly assess if content is unique. It supports quality control before publication. It facilitates cooperation with editorial teams and clients. It reduces the risk of traffic drops caused by duplicate content. It's real support for content auditing and on-page optimization.

The benefits are measurable. You get a similarity percentage for each source. You see the number of pages found. You know which fragments are problematic. You can make decisions about corrections, rewriting, or expanding the article more quickly.

• Better control over content originality.
• Faster detection of duplicated fragments.
• Time savings during audits and content updates.
• Support for assessing texts from copywriters.
• Clear data for SEO reports in CSV file format.

Typical uses for the Plagiarism Checker & Detector tool

• Detecting plagiarism in blog articles and guides.
• Verifying category and product descriptions in e-commerce.
• Quality control of text on landing pages.
• Checking academic papers and educational materials.
• Content audits after website migration.
• Evaluating paraphrasing and translations for similarity.

Comparison of Plagiarism Checker & Detector with other tools

Functionality	DiagnoSEO	Other tools
Checking sentence samples in Google search results	✅	❌
Similarity analysis directly on websites	✅	✅
List of sources with similarity percentage	✅	✅
Most frequent matches section with number of hits	✅	❌
Text preview with highlighted exact and similar matches	✅	❌
Export results to CSV	✅	❌

Tips and best practices

• Check your content before publishing and after each major update.
• Analyze not only the similarity percentage but also specific fragments.
• Expand your text with unique examples and your own data.
• Avoid copying the article structure from the source site.
• After making corrections, perform another analysis.

Common mistakes

• Publishing content without prior similarity verification.
• Mechanical paraphrasing without changing structure and substantive value.
• Duplicating product descriptions in multiple variants.
• Lack of control over duplicated fragments after site migration.
• Ignoring similar content in guide and definition sections.

How to use the Plagiarism Checker & Detector tool

1. Paste your text into the Text to check field.
2. Click the Check now button.
3. Wait for the analysis of search results and page content.
4. Check the "Sources" table and "similarity percentage".
5. Click on the selected source to see matched fragments.
6. Download the CSV file if you need a report.

Case study

The team prepared a guide article for publication. The content seemed unique. After analysis, the tool identified several sources with a high level of similarity. Specific sentences were highlighted in the preview. The editor used the DiagnoSEO tool to paraphrase the text and added their own examples. After rechecking, the similarity percentage dropped to 0%. The article was published without the risk of duplicate content.

FAQ

• Does the tool analyze the entire text?

  The analysis is based on sentence samples. Then, search results and page content are checked for matches.

• Where do the indicated sources come from?

  Sources come from Google search results for the analyzed sentence samples.

• What does the similarity percentage mean?

  The percentage shows what portion of the analyzed sentences was found in the content of a given page.

• Does the tool detect highly similar fragments?

  Yes. The text preview distinguishes exact and highly similar matches, making it easier to assess duplication risk.

• Can I use the results in an SEO report?

  Yes. Results can be downloaded in CSV format and used in documentation or client reports.