Checking for plagiarism and comparing texts is essential before submitting your thesis. In this article, we explore the most accurate plagiarism checking software available today.

1. Plagiarism Checker X

Plagiarism Checker X assists users in checking for duplicate content, is user-friendly, and suitable for various user groups such as students and journalists. With this tool, you can compare content between two documents or quickly check for duplicate spelling errors online. The free version limits many features, and if you need more, the Professional version will help you handle heavier workloads.
Download Plagiarism Checker X from this link: https://plagiarismcheckerx.com/
2. Plagiarism Detector

Plagiarism Detector is a robust tool for checking plagiarism, capable of scanning and searching for plagiarized content on the Internet effectively. Additionally, users can utilize Plagiarism Detector offline by comparing duplicate content in text files stored on their computers. After scanning and checking for duplicate content, the application will provide a report to users, and you can export the report file in various formats such as PDF, HTML... for convenient tracking and management.
- Download Plagiarism Detector from here: https://plagiarism-detector.com/c/en/index.php
3. Dupli Checker

Dupli Checker is an online plagiarism checking tool that requires no software installation on your computer to use. Simply open your browser, visit the Dupli Checker website, and start using it. Dupli Checker allows users to search for text content to see if it matches any previously published content on the Internet and provides the percentage of similarity for comparison. Additionally, users can export a report file in PDF format for easy offline comparison and editing of documents.
- Visit the website here: https://www.duplichecker.com/
4. Quetext

Quetext is straightforward and user-friendly, helping users quickly check for plagiarism. Quetext is an online plagiarism checking tool that you can simply access via the website. Quetext provides powerful plagiarism checking features and displays webpages with content matching the provided content.
- Access Quetext here: https://www.quetext.com/plagiarism-checker
5. SmallSEOTools

SmallSEOTools is a website that offers services for SEO professionals, such as plagiarism checking. With SmallSEOTools, you can search for and find duplicate passages of text from previously published content on websites. The process of checking plagiarism on SmallSEOTools is straightforward: simply copy the content, click 'Check Plagiarism', and wait for the results.
- Access SmallSEOTools here: https://smallseotools.com/plagiarism-checker/
6. Kiemtradaovan

Kiemtradaovan earns points for its user-friendly Vietnamese interface. The operation principle of Kiemtradaovan is that when users input the content to be checked for plagiarism and click Check Plagiarism, the website divides the content into smaller paragraphs and scans for duplicate results on Google. Then, users will see the status 'Already Exists' on the right side of the screen, indicating that the content has been previously published, and you can click on the paragraph to view the source page containing that content.
- Visit the website here: http://kiemtradaovan.com/kiem-tra-dao-van
7. Grammarly

When mentioning Grammarly, many people know about its powerful spell-checking service, but they may not know that Grammarly also provides a fairly good and fast plagiarism checking service. With a database of millions of websites, this service can search and filter accurate and detailed results. In addition to plagiarism checking, Grammarly also checks the grammar structure and spelling errors of the provided text, helping you to edit quickly. However, Grammarly still has a major drawback: it does not fully and accurately check Vietnamese plagiarism content.
- Access Grammarly's plagiarism checking service here: https://www.grammarly.com/plagiarism-checker
8. Check plagiarism

Check plagiarism is a highly useful online tool that helps you check plagiarism for free and accurately. The results of the search are divided into small sections with the status Plagiarized, meaning the text has been previously published, and Unique, indicating that the text has not been published before. Additionally, you can search for the original content webpage for tracking.
- Access Check plagiarism here: https://www.check-plagiarism.com/
9. Plagiarism Checker

Plagiarism Checker has a user-friendly interface in Vietnamese and operations. The advantage of Plagiarism Checker is its support for checking Vietnamese content accurately and comprehensively. Additionally, this online tool helps users analyze text passages and provides accurate reports on text length, word count, syllables, and keyword density. Users can download the report in PDF format after checking to compare and cross-reference on different devices.
- Visit the website here: https://www.plagiarismchecker.co/vi
10. Prepostseo

Prepostseo has a fairly simple English interface and is completely free. Additionally, the ability to check plagiarism on Prepostseo is quite accurate and fast. Users can search for duplicate content posted on which website and which specific article for easy tracking.
- Visit the website here: https://www.prepostseo.com/plagiarism-checker
With the aid of various software suggestions and plagiarism-checking tools mentioned in the article, concerns regarding plagiarism and copyright on the Internet can be significantly alleviated. Wishing you all success!