A list of key features:

1. Billions of web pages

This tool has the ability to check plagiarism by matching your content against billions of webpages on the Internet. Once you upload your content, it will automatically run it against every existing content on the web within seconds, making it the most sophisticated yet fastest plagiarism scanner you'll ever come across in your lifetime.

2. Automatic rewriting feature

It has an option for automatically rewriting the content you run on it in just one click. If your content contains plagiarized work, all you have to do is click on the rewrite option and you'll be taken to our auto-paraphrasing tool, where your content will be updated immediately. This is a built-in feature available right inside the tool for absolutely free.

3. Multiple document formats

Our similarity checker allows you to upload different formats of documents including .doc, .docx, .txt, .tex, .rtf, .odt, and .pdf. This means it does not matter what format your content takes, as long as it is digital, our tool will do the rest of the work.

4. URL integration

With this free online plagiarism test tool, not only are you able to upload different formats of documents, you can also check plagiarism via a website URL. Simply enter the webpage URL and click the "Check Plagiarism" button and you're good to go.

5. Reporting option

Our anti-plagiarism engine comes with a reporting option which allows you to download a report of the plagiarism search you run. This means you now have some sort of evidence to send across to the relevant parties and a record to keep. Awesome!

6. Sharing option

How about an option for sharing the plagiarism report generated? Would you like that right INSIDE the tool, too? Well, we got you covered!

7. Multiple languages

This feature allows you to check plagiarism on documents in other languages other than English. So whether your content is written in русский, 日本語, italiano, français, Português, Español, Deutsche, 中文, our tool can speak your language.

8. Cloud compatibility

Live in the cloud? Our originality checker is able to check content from the cloud, including Google Drive and Dropbox. Simply choose where your content lives in the cloud and pick the particular piece of document you want to run, and our copyright checker will do the rest.

9. Local storage

If your content is rather local, living in a file within your computer, then you can upload it directly from the local storage.

10. Percentage gauges

Once you've uploaded your content and clicked to check for plagiarism, our duplication checker will show you, in percentages, the levels of both plagiarized and unique content in the document. For example, it'll let you know that 82% of the content is unique while 18% is plagiarized.

11. A list-based, sentence-wise result

The tool does not stop at showing you the percentage levels of plagiarized and unique content. It also shows you, in a list format for easy detection, both plagiarized (if any) and unique areas of the content piece, sentence-by-sentence. Plagiarized sentences are shown in red while the unique ones are shown in green for your convenience.

12. Highlighted document view

With just one click, you can also see the result in a document view, where the whole content is displayed in one document and the plagiarized materials are highlighted in red.

13. Ability to view matched results

Right within the tool, you can view the external content that matches the red sentences in your document. Plus, the URL of the external webpage is added for a quick and easy examination of the content.

14. One-click comparison feature

After the results are in, you can click on the "Compare" button on any red (plagiarized) line to go to Google and compare that particular content with similar ones already published on the web. Great for finding where the plagiarized content is coming from.

15. Exclude Specific URL

If you don't want to detect plagiarism for a specific URL? Simply Insert that URL in the Exclude URL box and that'll be done for you automatically, Copied (plagiarized) content from that URL won't be countered as plagiarism.

16. Plagiarism Checker API

If you want to develop a real-time multitasking plagiarism detection system, incorporated into your website, then we have your back. The Plagiarism Checker API offers you a great API integration solution. This completely eliminates the need to check each and every article for every student individually and saves you hours upon hours of work and headache. You can check plagiarism for multiple essays, thesis or assignments of your students in just one click. This also works great for big websites who accept dozens of articles from contributors frequently.

17. Plagiarism Checker WordPress Plugin

The Small SEO Tools Plagiarism Checker also has its version of WordPress plugin for checking plagiarism. With it, you don't need to waste precious time copying and pasting the whole content of your post. Simply install the plugin, and whenever you are working on a new post or page content, click on the “Check Plagiarism” button and the plugin will automatically start checking the full content, sentence-by-sentence. You can also compare plagiarized content within the plugin by clicking on sentences. With this plugin, you don't have to worry about your content being stolen or the search engines penalizing your site for content duplication.