Sponsored by APIMaster.

Best 77 Plagiarism Checker Tools in 2026

AI Detector, ZeroGPT, Grammarize, Plag, NoPlagio, PlagiarismSearch.com, AI Checker, Rewording Tool, Winston AI, Factful are the best paid / free Plagiarism Checker tools.

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What is Plagiarism Checker?

A plagiarism checker is a software tool that analyzes text to identify instances of potential plagiarism by comparing the content to a database of sources. It helps ensure originality in writing and can detect copied content from websites, publications, and previously submitted works. The development of automated plagiarism detection has been driven by the increasing availability of digital content and the need to maintain academic and professional integrity.

What is the top 10 AI tools for Plagiarism Checker?

Core Features
Price
How to use

Grammarly

Grammar and spelling checker
Style and tone suggestions
AI-powered writing assistance
Plagiarism checker
Text generation
Brand tone detection

Free $0 USD / month Write without mistakes. See your writing tone. Generate text with 100 AI prompts.
Pro $12 USD / member / month, billed annually ($30 when billed monthly) Everything included in Free. Rewrite full sentences. Adjust your writing tone. Stay on-brand. Generate text with 2,000 AI prompts.
Enterprise Contact Sales Everything included in Pro. Unlimited members. Dedicated support. Confidential mode. Granular roles and permissions. Data loss prevention. Unlimited generative AI prompts.

Grammarly integrates with various applications and websites. Users can simply type or paste text into the Grammarly editor, or use the browser extension to receive real-time suggestions as they write. Grammarly provides feedback on grammar, spelling, punctuation, style, and tone, allowing users to improve their writing.

Copyleaks

AI Content Detection
Plagiarism Checker
Writing Assistant
API Integration
LMS Integration
Browser Extension

AI + Plagiarism Detection $13.99 /mo Up to 1,200 Credits (1 credit equals 250 words)
Plagiarism Checker $8.99 /mo Up to 1,200 Credits (1 credit equals 250 words)
AI Detector $7.99 /mo Up to 1,200 Credits (1 credit equals 250 words)
Enterprise & LMS Contact us For a plan tailor-made to fit the needs of your organization

Users can upload documents, paste text, or integrate Copyleaks' API into their existing systems to scan for plagiarism and AI-generated content. The platform provides detailed reports highlighting potential issues and sources of similarity.

Originality.ai

AI Content Detection
Plagiarism Checking
Fact Checking Aid
Readability Score Checker
Team Management
AI Content Detector API
Site Scan

Pay as you go $30 One time on-demand pricing. Get 3,000 one-time credits. Need more? You can buy additional credits as needed under "Settings" in your account. Unused credits expire 2 years after purchase. 1 credit equals 100 words
Pro $12.95/month (Annual) or $14.95/month (Monthly) For individuals and small teams. Get 2,000 credits per month. Need more? It's easy to top up and buy additional credits as needed. Subscription credits are set to expire at the end of each month if they aren't used. 1 credit equals 100 words
Enterprise $136.58/month (Annual) or $179/month (Monthly) Ideal for agencies & publishers. Get 15,000 credits per month. Need more? It's easy to top up and buy additional credits as needed. Subscription credits are set to expire at the end of each month if they aren't used. 1 credit equals 100 words

Users can sign up for Originality.ai, choose a pricing plan, and then use the AI checker, Plagiarism Checker, Fact Checker, and Readability Checker to analyze their content. They can upload files, paste text, or scan entire websites to understand the originality and quality of their content.

Winston AI

AI content detection
Plagiarism checker
AI image detection
Writing feedback
HUMN-1 Website certification

Free $0 2,000 credits / 14 day trial. Includes AI Content detection, AI Image & deepfake detection, Email and Chat support, Scan documents, HUMN-1 website certification / 14 day trial, Scan pictures and handwriting (OCR), Generate shareable PDF reports, Advanced plagiarism detection, Invite team members, Top-up Credits
Essential (Monthly) $12 / month 80,000 credits / month. Includes AI Content detection, AI Image & deepfake detection, Writing Feedback, Email and chat support, Scan documents, Scan pictures and handwriting (OCR), Generate shareable PDF reports, Advanced plagiarism detection, Invite team members, Top-up Credits
Advanced (Monthly) $19 / month 200,000 credits / month. Includes AI content detection, Advanced plagiarism detection, AI Image & deepfake detection, Writing Feedback, Email and chat support, Scan documents, Scan pictures and handwriting (OCR), Generate shareable PDF reports, HUMN-1 website certification, Up to 5 team members, Top-up Credits
Elite (Monthly) $32 / month 500,000 credits / month. Includes AI content detection, Advanced plagiarism detection, AI Image & deepfake detection, Writing Feedback, Email and Chat support, Scan documents, Scan pictures and handwriting (OCR), Generate shareable PDF reports, HUMN-1+ website certification, Unlimited team members, Top-up Credits
Essential (Annual) $18 / month 80,000 credits / month. Includes AI Content detection, AI Image & deepfake detection, Writing Feedback, Email and chat support, Scan documents, Scan pictures and handwriting (OCR), Generate shareable PDF reports, Advanced plagiarism detection, Invite team members, Top-up Credits
Advanced (Annual) $29 / month 200,000 credits / month. Includes AI content detection, Advanced plagiarism detection, AI Image & deepfake detection, Writing Feedback, Email and chat support, Scan documents, Scan pictures and handwriting (OCR), Generate shareable PDF reports, HUMN-1 website certification, Up to 5 team members, Top-up Credits
Elite (Annual) $49 / month 500,000 credits / month. Includes AI content detection, Advanced plagiarism detection, AI Image & deepfake detection, Writing Feedback, Email and Chat support, Scan documents, Scan pictures and handwriting (OCR), Generate shareable PDF reports, HUMN-1+ website certification, Unlimited team members, Top-up Credits

To use Winston AI, create a free account, enter the text you want to check (either by pasting or uploading a document), and the AI detector will provide a percentage indicating the likelihood of the text being generated by a human or AI. You can also activate the plagiarism checker to scan for plagiarized content.

BypassGPT

AI text humanization
Bypass AI detection
Plagiarism-free rewrites
Error-free content
SEO-friendly output
Multilingual paraphrasing

Free $0 150 Words / month
Unlimited $39 Unlimited Words / month
Unlimited $19 Unlimited Words / month
Pro $15 30,000 Words / month

To use BypassGPT, copy your AI-generated content into the portal, click the button to start the process, and receive your rewritten text moments later.

Smodin

AI Text Rewriter
Plagiarism Checker
AI Writer
AI Content Detector
AI Essay Grader
Multi-lingual Translator
AI Homework Solver
Citation Machine

Teachers (Starter Plan) $9 USD /Month billed annually Includes AI Detector, AI Grader, and Plagiarism Checker
Students (Best Value) $15 USD /Month billed annually Includes Author, Paragraph Rewriter, Text Summarizer, Multi-lingual translator, and Omni
Ultimate (Premium) $18 USD /Month billed annually Includes AI Detector, AI Grader, Plagiarism Checker, Author, Paragraph Rewriter, Text Summarizer, Multi-lingual translator, and Omni

Smodin provides various AI-powered tools accessible through its dashboard. Users can select the desired tool, such as the text rewriter or plagiarism checker, and input their text. The AI then processes the text and provides the requested output, such as rewritten content or a plagiarism report.

Trinka AI

Grammar Checker
Paraphraser
Plagiarism Checker
AI Content Detector
Citation Checker
Journal Finder
AI Studio
Consistency Check
Proofread File
Inclusive Language Checks
Personal Dictionary

Basic Plan Free Write better for free with Trinka's Basic Plan.
Premium Upgrade to Premium subscription Get powerful writing assistance at the best value.

Simply paste your text into the editor or upload your document, and Trinka will automatically highlight and suggest corrections for grammar, punctuation, and academic style improvements. Trinka also offers a Microsoft Word add-in and browser extensions.

PlagiarismCheck.org

Plagiarism detection
AI content detection
Authorship verification
Similarity percentage reports
Integration with educational platforms

Basic $5.99 For individuals
Light $9.99 For individuals
Standard $25.49 For individuals
Premium $45.49 For individuals
Advanced Contact for quote For organizations
PRO Contact for quote For organizations

Users can upload documents or paste text into the online checker. The system analyzes the content against various databases and the internet, providing a similarity percentage and highlighting potential plagiarism.

Quetext

Plagiarism Checker
AI Content Detector
AITutorMe paraphrasing tool
Citation Generator
DeepSearch™ technology
ColorGrade™ Feedback
Interactive Snippet Text

Free $0/month Deep Search Plagiarism Checker (up to 500 words), AI Content Detector (up to 250 words), Website Citation Generator, Citation Assistant
Essential Starting from $13.99/month AITutorMe, Includes 100,000 Words, Bulk file uploads (up to 20 files), Google Drive & Microsoft OneDrive file uploads, Grammar & Spell check, Everything in free
Enterprise Starting from $11.99/month AITutorMe, Unlimited users, Remarks Tool, Admin Control, Select the monthly word count that works best for your needs, Everything in Essential

Users can check for plagiarism and AI content by uploading text or documents to the Quetext website. The tool analyzes the content and provides feedback on originality, potential plagiarism, and AI-generated content. AITutorMe helps paraphrase content, and the citation generator creates citations in MLA, APA, and Chicago styles.

Rytr

AI Autocomplete Text
Text Editing: Continue Writing
Text Inflator
Grammar Checker & Text Improver
AI Paragraph Generator
Rewording Generator
Sentence Shortener
AI Command Generator
Blog Outline Generator
AI Blog Generator
AI Meta Description Generator
SEO Meta Title Generator
AI Landing Page Generator
Keyword Extractor
AI Keyword Generator
AI Newsletter Generator
Custom Poem Generator
AI Song Generator
AI Story Generator
Call To Action Generator
Social Media Ad Generator
Google Ad Generator
AI Caption Generator
AI SMS Generator
AI Bio Generator
Video Description Generator
Video Channel Description Generator
Video Idea Generator
AI LinkedIn Post Generator
AI Quora Answer Generator
AI Facebook Post Generator
AI Product Description Generator
AI Bullet Point Generator
AIDA Copywriting Generator
PAS Copywriting Generator
AI Response Generator
Business Pitch Generator
AI Business Idea Generator
AI Cover Letter Generator
Email Generator
AI Interview Question Generator
AI Job Description Generator
AI Tagline Generator
AI Real Estate Listings

Free $0/m Free forever, no CC required. Generate 10k characters per month, Access 40+ use-cases, Write in 20+ tones, Access to chrome extension
Unlimited $7.50/m Unlimited generations for individuals getting started with generative AI. Everything in Free + Generate UNLIMITED copy each month, Build 1 personalised tone of voice, 50/m plagiarism checks
Premium $24.16/m For freelancers that need to create content for multiple brands. Everything in Unlimited + Build 5 personal tones of voice, Increased character input limits, Write in 40+ languages, 100/m plagiarism checks

Choose from over 40+ content use cases and templates—from email responses and blog posts to social media ads and everything in between. Rytr's Chrome Extension lets you craft quality content wherever you write.

Newest Plagiarism Checker AI Websites

Free AI content and plagiarism checker for various AI models.
AI-powered digital marketing agency specializing in SEO, content creation, and plagiarism removal.
AI Detector helps maintain content quality by detecting AI-generated text and humanizing it.

Plagiarism Checker Core Features

Text comparison against extensive databases of web pages, publications, and previously submitted content.

Identification of exact matches, paraphrasing, and similar sentence structures.

Generation of similarity reports highlighting potential plagiarism instances and their sources.

Integration with various file formats and platforms, such as word processors and learning management systems.

What is Plagiarism Checker can do?

Educational institutions use plagiarism checkers to detect academic dishonesty and ensure the integrity of student work.

Academic publishers and conferences employ plagiarism checkers to screen submissions for originality.

Content creation agencies use plagiarism checkers to ensure the uniqueness of their clients' content.

Legal professionals utilize plagiarism checkers to identify potential copyright infringement cases.

Plagiarism Checker Review

Users generally find plagiarism checkers to be helpful tools for detecting potential instances of plagiarism and ensuring the originality of their work. They appreciate the time-saving aspect and the peace of mind these tools provide. However, some users caution against relying solely on plagiarism checkers, emphasizing the importance of human judgment and proper citation practices. Criticisms include the occasional false positives and the inability to detect all forms of plagiarism, particularly heavily paraphrased content.

Who is suitable to use Plagiarism Checker?

A student uses a plagiarism checker to ensure their essay is original before submitting it for grading.

A researcher employs a plagiarism checker to verify the novelty of their work before publishing.

An author uses a plagiarism checker to avoid unintentional plagiarism in their manuscript.

How does Plagiarism Checker work?

To use a plagiarism checker, the user typically uploads or pastes the text into the tool's interface. The software then analyzes the content, comparing it against its database of sources. Results are presented in a report format, highlighting instances of potential plagiarism and providing links to the original sources. Some tools allow users to exclude specific sources or customize the sensitivity of the plagiarism detection algorithm.

Advantages of Plagiarism Checker

Ensures originality in writing and helps prevent unintentional plagiarism.

Saves time by automating the process of checking for plagiarism across multiple sources.

Provides documentation to support the authenticity of the work.

Helps maintain academic integrity and professional ethics.

Offers learning opportunities by identifying areas where proper citation or paraphrasing is needed.

FAQ about Plagiarism Checker

What is a plagiarism checker?
How does a plagiarism checker work?
Can a plagiarism checker detect all forms of plagiarism?
Are plagiarism checkers 100% accurate?
Can plagiarism checkers be fooled?
Are plagiarism checkers essential for ensuring academic integrity?