Plagiarism Checker

The Plagiarism Checker is a powerful Apify actor designed to detect plagiarism in texts. Using advanced algorithms, it scans provided texts or files against a vast database of online sources and provides a detailed report indicating potential plagiarism.

Why Use the Plagiarism Checker?

This tool offers a fast and reliable solution for verifying content authenticity. It saves you time by automating the process of checking for copied content.

• Accuracy: Compares text against billions of web pages and academic papers.
• Flexibility: Supports both plain text and various file formats.
• Large Text Support: Automatically splits texts longer than 1,000 words into 1,000-word chunks for analysis. This ensures that even very large documents can be processed smoothly.
• Easy Integration: Can be easily run on the Apify platform, and the results can be exported in different formats (JSON, CSV, Excel).

Features

• Scans for plagiarism by text or file upload.
• Supported file formats: .txt, .md, .html, .pdf, .docx.
• Provides a detailed report with matched sources, similarity scores, and highlighted text.
• Automatically splits large texts into parts and analyzes each one.
• Includes proxy support and a retry mechanism for more reliable results.
• Stores the results in a structured format in the Apify dataset.

Use Cases

• Academic Integrity: For educational institutions to detect plagiarism in assignments, theses, and research papers.
• Content Creation: For writers, bloggers, and publishers to ensure their content is original before publishing.
• SEO Optimization: For SEO specialists to avoid duplicate content penalties from search engines.
• General Purpose: For anyone who wants to check a text for plagiarism.

Usage

1. Run this actor in the Apify console.
2. Provide the necessary inputs:
   • textContent: Enter the text you want to scan for plagiarism (or upload a file below).
   • fileUpload: Upload a file for plagiarism checking (.txt, .md, .html, .pdf, .docx). If you upload a file, the text field above is ignored.
   • proxyConfiguration: It is recommended to use a proxy for faster and more reliable results.

Example Input

{
  "textContent": "Barack H. Obama is the 44th President of the United States. His story is the American story — values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others.",
  "proxyConfiguration": {
    "useApifyProxy": true,
    "apifyProxyGroups": []
  }
}

Output

The collected data is saved to the Apify dataset. The output data includes the following fields:

• results.document_score: Overall plagiarism score for the document (as a percentage).
• results.results.phrase: The original phrase from your text that was checked.
• results.results.results.link: The URL of the source where a match was found.
• results.results.results.title: The title of the source page.
• results.results.results.scores.score: The similarity score for the matched sentence.
• results.results.results.scores.sentence: The specific sentence from the source that matches your text.

Example Output

{
    "results": {
        "document_score": 100,
        "sources": 0,
        "results": [
            {
                "phrase": "Barack H. Obama is the 44th President of the United States.",
                "results": [
                    {
                        "link": "https://obamawhitehouse.archives.gov/administration/president-obama",
                        "title": "President Barack Obama | whitehouse.gov",
                        "scores": [
                            {
                                "score": 0.8999999999999999,
                                "sentence": "Jump to main content Jump to navigation President Barack Obama Barack Obama is the 44th President of the United States."
                            },
                            {
                                "score": 1,
                                "sentence": "Download Low-res (296 KB) Download Hi-res (1256 KB) Barack H. Obama is the 44th President of the United States."
                            }
                        ],
                        "timestamps": {
                            "date_modified": "2015-10-30",
                            "date_published": "2014-12-07"
                        }
                    },
                    {
                        "link": "https://barackobama.com/about/?source=footer-nav",
                        "title": "About the office - The Office of Barack and Michelle Obama",
                        "scores": [
                            {
                                "score": 1,
                                "sentence": "Skip to main content About the office Download Low-res (296 KB) Download Hi-res (1256 KB) About President Barack Obama Barack H. Obama is the 44th President of the United States."
                            },
                            {
                                "score": 0.75,
                                "sentence": "On November 4, 2008, Barack Obama was elected the 44th President of the United States, winning more votes than any candidate in history."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.wasatchspeakers.com/presidentbarackobama",
                        "title": "President Barack Obama | Wasatch Speaker Series | Salt Lake City ...",
                        "scores": [
                            {
                                "score": 1,
                                "sentence": "Virtual event Live via Zoom Virtual event Live via Zoom Barack H. Obama is the 44th President of the United States."
                            },
                            {
                                "score": 0.75,
                                "sentence": "? On November 4, 2008, Barack Obama was elected the 44th President of the United States, winning more votes than any candidate in history.?"
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.nobelprize.org/prizes/peace/2009/obama/speedread/",
                        "title": "Barack H. Obama – Speed read - NobelPrize.org",
                        "scores": [
                            {
                                "score": 1,
                                "sentence": "Obama’s own response was: “I will accept this prize as a call to action.” Barack H. Obama is the 44th President of the United States."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://libguides.aum.edu/c.php?g=1251288&p=9162008",
                        "title": "O-R - Bestsellers & Beyond: Browsing Collection",
                        "scores": [
                            {
                                "score": 0.7149282067595649,
                                "sentence": "Featured Authors: Barack and Michelle Obama Barack H. Obama is the 44th President of the United States."
                            },
                            {
                                "score": 0.85,
                                "sentence": "Barack H. Obama On November 4, 2008, Barack Obama was elected the 44th President of the United States, winning more votes than any candidate in history."
                            }
                        ],
                        "timestamps": {
                            "date_modified": "2025-05-05",
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.uspresidency.com/p/barack-obama.html",
                        "title": "Barack Obama - POTUS",
                        "scores": [
                            {
                                "score": 0.8152098448330138,
                                "sentence": "Barack Obama Barack H. Obama 44th? U.S. President?"
                            },
                            {
                                "score": 1,
                                "sentence": "Barack H. Obama is the 44th President of the United States."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.veteransforchrist.net/page15.html",
                        "title": "President Obama at Eastfield College - Veterans for Christ",
                        "scores": [
                            {
                                "score": 1,
                                "sentence": "Barack H. Obama is the 44th President of the United States."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.nobelprize.org/page/15/?np-year=2009",
                        "title": "The Nobel Prize Award Ceremony 2009 - Opening Address",
                        "scores": [
                            {
                                "score": 1,
                                "sentence": "On all publications in full or in major parts the above underlined copyright notice must be… Barack H. Obama – Facts Facts Barack H. Obama – Biographical Biographical Barack H. Obama is the 44th President of the United States."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://news.columbia.edu/news/president-barack-obama-speak-barnard-college-commencement",
                        "title": "President Barack Obama to Speak at Barnard College ...",
                        "scores": [
                            {
                                "score": 1.0000000000000002,
                                "sentence": "Barack H. Obama is the 44th President of the United States."
                            },
                            {
                                "score": 1.0000000000000002,
                                "sentence": "Barack H. Obama is the 44th President of the United States."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.usgbc.org/articles/former-president-united-states-barack-obama-keynote-2019-greenbuild-international-conferenc",
                        "title": "Former President of the United States Barack Obama to Keynote the ...",
                        "scores": [
                            {
                                "score": 1.0000000000000002,
                                "sentence": "Barack H. Obama is the 44th President of the United States."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://trumpwhitehouse.archives.gov/about-the-white-house/presidents/barack-obama/",
                        "title": "Barack Obama – The White House",
                        "scores": [
                            {
                                "score": 0.865178102423503,
                                "sentence": "Barack Obama served as the 44th President of the United States."
                            },
                            {
                                "score": 0.865178102423503,
                                "sentence": "Barack Obama served as the 44th President of the United States."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://southern.libguides.com/presidency/obama",
                        "title": "U.S. Presidents & Presidency: Obama",
                        "scores": [
                            {
                                "score": 0.7234901793199575,
                                "sentence": "Barack Obama: White House Barack Obama served as the 44th President of the United States."
                            },
                            {
                                "score": 0.75,
                                "sentence": "Barack Obama Barack Hussein Obama II served as the 44th president of the United States from 2009 - 2017."
                            },
                            {
                                "score": 0.75,
                                "sentence": "Internet Resources Barack Obama: White House Barack Obama served as the 44th President of the United States."
                            },
                            {
                                "score": 0.8999999999999999,
                                "sentence": "Barack Obama: History Barack Obama, the 44th president of the United States and the first African American president, was elected over Senator John McCain of Arizona on November 4, 2008."
                            },
                            {
                                "score": 0.8999999999999999,
                                "sentence": "Barack Obama: History Barack Obama, the 44th president of the United States and the first African American president, was elected over Senator John McCain of Arizona on November 4, 2008."
                            }
                        ],
                        "timestamps": {
                            "date_modified": "2025-05-12",
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://westportlibrary.libguides.com/barackobama",
                        "title": "Barack Obama: About - The Westport Library Resource Guides",
                        "scores": [
                            {
                                "score": 0.8470937391314671,
                                "sentence": "Barack Obama served as the 44th President of the United States."
                            },
                            {
                                "score": 0.8999999999999999,
                                "sentence": "Barack Obama (Biography) ? Barack Obama (US Congress) Barack Obama (US Congress) The Obama Years, Through the Lens of Photographer Pete Souza (The Atlantic) The Obama Years, Through the Lens of Photographer Pete Souza (The Atlantic) Biography of Barack Obama, 44th President of the United States (Thought Co.) Biography of Barack Obama, 44th President of the United States (Thought Co.) From our Collection From our Collection Click Here to Learn More About the"
                            }
                        ],
                        "timestamps": {
                            "date_modified": "2024-10-23",
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://assets.goennounce.com/user/0/000/183/862/183862/2016-10-15/e8c2c069888a3273f8651483f4e13e34e487f3bf.docx",
                        "title": "[DOC] e8c2c069888a3273f8651483f4e...",
                        "scores": [
                            {
                                "score": 1.0000000000000002,
                                "sentence": "Barack Obama is the 44th President of the United States."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    }
                ]
            },
            {
                "phrase": "His story is the American story - values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others.",
                "results": [
                    {
                        "link": "https://trumpwhitehouse.archives.gov/about-the-white-house/presidents/barack-obama/",
                        "title": "Barack Obama – The White House",
                        "scores": [
                            {
                                "score": 0.9999999999999996,
                                "sentence": "His story is the American story - values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            },
                            {
                                "score": 0.9999999999999996,
                                "sentence": "His story is the American story - values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://obamawhitehouse.archives.gov/administration/president-obama",
                        "title": "President Barack Obama | whitehouse.gov",
                        "scores": [
                            {
                                "score": 0.9999999999999996,
                                "sentence": "His story is the American story -- values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            },
                            {
                                "score": 0.9999999999999996,
                                "sentence": "His story is the American story — values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            }
                        ],
                        "timestamps": {
                            "date_modified": "2015-10-30",
                            "date_published": "2014-12-07"
                        }
                    },
                    {
                        "link": "https://southern.libguides.com/presidency/obama",
                        "title": "U.S. Presidents & Presidency: Obama",
                        "scores": [
                            {
                                "score": 1.0000000000000002,
                                "sentence": "His story is the American story — values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            },
                            {
                                "score": 1.0000000000000002,
                                "sentence": "His story is the American story — values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            }
                        ],
                        "timestamps": {
                            "date_modified": "2025-05-12",
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.nobelprize.org/prizes/peace/2009/obama/speedread/",
                        "title": "Barack H. Obama – Speed read - NobelPrize.org",
                        "scores": [
                            {
                                "score": 0.7092972666062737,
                                "sentence": "His story is the American story – values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others ... Disclaimer: Every effort has been made by the publisher to credit organisations and individuals with regard to the supply of photographs."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.uspresidency.com/p/barack-obama.html",
                        "title": "Barack Obama - POTUS",
                        "scores": [
                            {
                                "score": 1,
                                "sentence": "His story is the American story — values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.veteransforchrist.net/page15.html",
                        "title": "President Obama at Eastfield College - Veterans for Christ",
                        "scores": [
                            {
                                "score": 1.0000000000000002,
                                "sentence": "His story is the American story — values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://westportlibrary.libguides.com/barackobama",
                        "title": "Barack Obama: About - The Westport Library Resource Guides",
                        "scores": [
                            {
                                "score": 0.9999999999999996,
                                "sentence": "His story is the American story — values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            }
                        ],
                        "timestamps": {
                            "date_modified": "2024-10-23",
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.nobelprize.org/page/15/?np-year=2009",
                        "title": "The Nobel Prize Award Ceremony 2009 - Opening Address",
                        "scores": [
                            {
                                "score": 0.9999999999999996,
                                "sentence": "His story is the American story – values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://assets.goennounce.com/user/0/000/183/862/183862/2016-10-15/e8c2c069888a3273f8651483f4e13e34e487f3bf.docx",
                        "title": "[DOC] e8c2c069888a3273f8651483f4e...",
                        "scores": [
                            {
                                "score": 0.793525437054516,
                                "sentence": "... strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            },
                            {
                                "score": 0.7272222222222221,
                                "sentence": "His story is the American story -- values from the heartland, a middle-class upbringing in a strong."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://news.columbia.edu/news/president-barack-obama-speak-barnard-college-commencement",
                        "title": "President Barack Obama to Speak at Barnard College ...",
                        "scores": [
                            {
                                "score": 0.7091037579240462,
                                "sentence": "... His story is the American story—values from the heartland, a middle-class upbringing in a strong family, hard work and education as the."
                            },
                            {
                                "score": 0.7051041486886854,
                                "sentence": "... as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others."
                            },
                            {
                                "score": 0.7024999999999999,
                                "sentence": "His story is the American story—values from the heartland, a middle-class upbringing."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    },
                    {
                        "link": "https://www.barnesandnoble.com/w/obama-christopher-handy/1110369036",
                        "title": "OBAMA by Christopher Handy | eBook | Barnes & Noble®",
                        "scores": [
                            {
                                "score": 0.7213457143327899,
                                "sentence": "... His story is the American story, values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting."
                            }
                        ],
                        "timestamps": {
                            "date_modified": null,
                            "date_published": null
                        }
                    }
                ]
            }
        ]
    }
}

This example output shows the statistical data resulting from the analysis of the submitted text. The output is a list containing a similar object for each piece of text analyzed.

Notes

• The collected data is stored in Apify's default data store.