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Plagiarized content promises adverse consequences for students, writers, and website owners.

For students, plagiarism might lead to low grades, automatically failing a course, academic probation, or even expulsion.

For business owners, an instance of plagiarism might be a copyright violation that results in fines and lawsuits. When plagiarism rises to the point of duplicate content (copying entire blog posts and web pages), it can also affect how your site ranks.

Google will have to choose between the two similar versions and remove one from search engine results. This will result in the deindexed version missing out on the opportunities that come with a strong rank on search engine results.

The good news is that there are multiple plagiarism checkers out there, most of which you won’t have to pay a dime for. Whether you’re a teacher, student, writer, or website owner, here are five free plagiarism checkers you can start using today:

1: SmallSEOTools

screenshot of SmallSEOTools
Source: SmallSEOTools

SmallSEOTools is a swiss army knife for website owners and writers. Besides offering a free plagiarism checker, it features various website optimization tools, including a:

  • Spell checker
  • Backlink and keyword analytics tool
  • Text case changer
  • Article rewriting tool

The SmallSEOTools free plagiarism checker will allow you to scan up to 1000 words of content as many times as you like.

You can upload your content from Google Drive, Dropbox, or your local drive. It supports multiple document formats including .rtf, .pdf, .docx, .txt, and .od. Alternatively, you can paste a URL into the site to scan it for plagiarism.

  • Accurate
  • Integration with Dropbox & Google Drive
  • Unlimited searches
  • Shows plagiarized matches
  • Can upload .rtf, .pdf, .docx, .txt, and .odt files
  • Limited to 1,000 words per search
  • Site features ads

Here’s what Avishek Maity had to say about this tool:

I have to go through multiple assignments on a daily basis, ensuring their authenticity is a tough job to accomplish. The detailed reporting option offered by SmallSEOTools Plagiarism Checker eases out the entire process.


screenshot of
Source: is an amazing tool for writers, teachers, students, and website owners. Its free version allows you to scan up to 1,000 words of content for plagiarism at a time, and there are no limits to how many times you can run the scan.

Its paid version, however, has no word limit. Unlike the free version, the premium version is also ad-free. The pro version is divided into three price plans: student ($20/month), institute ($40/month), and enterprise ($80/month).

The tool looks for plagiarism through word choice, matching phrases, and lexical frequencies.

It allows you to upload content in different formats including .txt, .doc, and .docx. You can also upload text directly from Dropbox or scan content straight from a URL.

Its biggest downside is the 1,000-word limit per search. This limit can complicate how easily authors and teachers can scan complete content for plagiarism.

  • Accurate
  • Unlimited number of checks
  • Can upload multiple file formats, including .doc, .pdf, and plain text
  • Allows you to check plagiarism through a URL
  • Free version limits each search to 1,000 words
  • Site features ads

Here’s what Uridah CA had to say about this tool:

This is the best plagiarism checker… helps me a lot in my assignments and daily tasks as a student.

3: DupliChecker

screenshot of DupliChecker
Source: DupliChecker

DupliChecker is targeted at website owners, marketing agencies, and writers. It features a free plagiarism checker that allows unlimited document scans. The tool caps each scan at 1,000 words.

You can paste content directly into the tool, paste a URL, or upload content from your local drive, Google Drive, or Dropbox. It supports multiple file formats, including .rtf, .pdf, .doc, and .txt.

Just like SmallSEOTools, this tool features multiple website content optimization solutions, including a:

  • Grammar checker
  • Spell checker
  • Sentence case changer
  • Accurate
  • Unlimited searches
  • Supports multiple document formats
  • Has additional website content optimization tools
  • Integration with Dropbox & Google Drive
  • Each scan is capped at 1,000 words
  • Site has ads

Here’s what Salvatore Balboni, a reviewer, had to say about the tool:

Duplichecker might not have the fancy additional features that other sites in this domain have, but it always delivers on what it promises. It is especially useful for plagiarism detection.


screenshot of
Source: is a great tool for teachers, students, writers, and website owners who are looking to rid their work of plagiarism. Unlike the tools we’ve mentioned so far, this one allows unlimited scans with an upper limit of 1,500 words per scan. It also features a grammar checker.

The tool lets you paste text or upload your documents directly from your local drive or Dropbox. Besides supporting multiple document formats, the tool allows you to check for plagiarism in 16 different languages.

  • Accurate
  • Supports 16 different languages
  • Has a grammar checker
  • Supports .doc, .pdf, .plain text and other file formats
  • Can download reports
  • Up to 1,500 words per scan
  • Site has ads

5: Plagiarism Checker X

screenshot of Plagiarism Checker X
Source: Plagiarism Checker X

Plagiarism Checker X is ideal for students, teachers, writers, and business owners. Unlike the other plagiarism detectors on this list, it’s a tool that you’ll have to download onto your device.

The software features a side-by-side comparison, content similarity detection, and bulk cross-comparison. This last perk makes it ideal for teachers looking for plagiarism between students’ work.

Plagiarism Checker X supports plagiarism scans in seven languages, including French, German, English, Spanish, Italian, Portuguese, and Dutch. You can also scan for plagiarism using multiple file formats, such as .pdf, .doc, and .rtf. The free version allows up to 30 daily free scans, each one capped at 1,000 words.

The tool also offers two lifetime premium versions: a professional plan at $39.95 and a business plan at $147.95. The business plan includes all professional plan features with the addition of four more users, branding reports, priority support, and spreadsheet support.

You’ll only need to pay a small yearly maintenance fee after this.

Its biggest downside is that it’s only compatible with Windows. Mac users will have to look for alternatives.

  • Accurate
  • It’s a downloadable tool
  • Supports multiple document formats including .pdf, .doc, and .rtf
  • Supports 7 different languages
  • Limited to 30 daily scans of not more than 1,000 words
  • Only compatible with Windows

Here’s what Surajit Maity, a reviewer, had to say about the software:

The software offers comprehensive reports for all your scans… The best part is its bulk search feature that can be used by teachers, researchers, and students for checking multiple documents.

Pick a Tool That Works for You

Plagiarism will always threaten your work, whether you are a writer, business owner, or student. Choose any of the tools above to check your work for plagiarism before publishing or submitting it. Best of all, some of the tools offer multiple solutions that can add even more value to your writing.

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Katrina McKinnon

I'm Katrina McKinnon, the author behind Small Revolution. With two decades of hands-on experience in online work, running eCommerce stores, web agency and job boards, I'm now on a mission to empower you to work from home and achieve work-life balance. My passion lies in crafting insightful, education content. I have taught thousands of students and employees how to write, do SEO, manage eCommerce stores and work as Virtual Assistants. Join our most popular course: SEO Article Masterclass