Best Plagiarism Checkers

Best Paid Plagiarism Checkers

Turnitin

Turnitin is the gold standard for plagiarism detection in academic settings. It compares student submissions against a proprietary database of student papers, scholarly content, and internet sources. Institutions rely on Turnitin to uphold academic integrity, with features like similarity scoring, feedback tools, and integrated grading. While not available for personal use, it remains the most robust option for universities, high schools, and colleges seeking enterprise-level detection and reporting. Turnitin's deep integration with LMS platforms makes it a seamless part of institutional workflows worldwide.

iThenticate

iThenticate is Turnitin’s sister product, tailored for researchers, publishers, and grant writers. It checks content against a massive scholarly database, including journal articles, white papers, and preprint repositories. Its detailed reports show percentage matches and side-by-side comparisons, helping authors identify inadvertent overlaps. iThenticate is trusted by top publishers like Elsevier and IEEE, making it a leading tool for professionals submitting to academic journals. Its pay-as-you-go pricing structure makes it practical for researchers who need high-accuracy checks on a per-document basis.

Plagscan

Plagscan offers precision plagiarism detection with a focus on clarity and customization. Reports highlight exact matches, suggest citation improvements, and allow commenting for collaboration. It’s suitable for educational institutions, corporate teams, and individual writers who want a transparent and GDPR-compliant solution. With options for file upload, direct text input, and cloud integration, Plagscan adapts to a variety of workflows. Its combination of affordability, detailed output, and multi-language support makes it a favorite among educators and multilingual content creators alike.

Unicheck

Unicheck is an education-first plagiarism checker built for seamless integration with learning management systems like Canvas, Moodle, and Google Classroom. It delivers real-time feedback and intuitive reports with inline highlighting and originality percentages. The cloud-based tool emphasizes user privacy and collaborative teaching tools, such as assignment check history and institutional dashboards. While not available to individuals, Unicheck is widely adopted by schools and universities seeking a scalable, student-friendly plagiarism detection experience.

Quetext Pro

Quetext Pro delivers fast, user-friendly plagiarism detection powered by its DeepSearch™ algorithm. Users get access to unlimited checks, citation assistance, and a built-in grammar checker. The interface is clean and intuitive, making it a top choice for writers, educators, bloggers, and small businesses. The affordable monthly plan offers significant value, especially for users working with long-form content. Quetext’s detailed side-by-side reports and automatic citation generation tools make it a strong contender in the personal and professional writing space.

Best Free Plagiarism Checkers

Quetext (Free)

Quetext’s free version allows users to scan up to 500 words per search, making it a great option for checking short essays, social media captions, or blog snippets. It uses the same clean interface as the Pro version, offering color-coded match highlights and basic similarity scoring. While citation tools and full-length reports require a paid upgrade, the free tier remains useful for students and writers who need fast, no-frills checks without creating an account or installing extensions.

Small SEO Tools

Small SEO Tools provides a free plagiarism checker with multi-format support — including text boxes, file uploads, and URL scanning. It’s a popular choice among bloggers, freelancers, and marketers looking to check content quickly before publishing. Though the results aren’t as precise as premium services and the tool is ad-supported, its flexibility and zero-cost access make it a handy resource for users needing light plagiarism checks without signing up.

PlagiarismDetector.net

PlagiarismDetector.net offers a straightforward plagiarism detection experience with match percentages and flagged segments. Users can paste text or upload documents for analysis. While daily checks are limited on the free plan, it remains a good option for bloggers and content marketers working on short pieces. The tool focuses on detecting exact wording overlaps from online content and gives a pass/fail overview suitable for casual users. It’s particularly helpful for proofreading and quality assurance before publishing public-facing material.

PrePostSEO

PrePostSEO’s free plagiarism checker is a robust and accessible tool for scanning essays, blog content, or academic writing. It supports text input, file uploads (TXT, DOC, DOCX, PDF), and URL checking. Results are presented in a side-by-side comparison, with match percentages and color-coded highlights. While the interface contains ads and CAPTCHA verification, no sign-up is required for basic use. The tool is especially useful for writers, students, and marketers looking to validate originality without spending money or creating an account. It’s widely used across education and content marketing workflows.

PaperRater

PaperRater combines basic plagiarism detection with grammar suggestions and vocabulary enhancement, making it a solid tool for students drafting essays or reports. The free version analyzes short to medium-length content and provides immediate feedback without needing registration. While not accurate enough for final submission checks, it’s ideal for early-stage editing and learning. Users benefit from integrated tips to improve clarity, structure, and word choice, creating a more complete writing support tool beyond just originality checks.