Check-Plagiarism checks submitted text and identifies passages that match other sources. Users can paste or type text, or upload DOC, DOCX, TXT, and PDF files; the maximum document length is 7,000 words. The service says its AI can identify paraphrases and lightly edited text as well as exact matches. Reports include sentence-level matches, matching sources, and similarity percentages, and can be downloaded or shared. The checker claims support for over 20 languages and says it checks billions of web pages, along with academic databases and publications. The stated file limits differ: one feature description allows five documents at once, while the homepage sets a maximum of three for free users and 20 for premium users per search. Free online use has limited searches, and registered accounts can increase that limit. Plans include Monthly at 14.99 USD per month and Annual at 8.33 USD per month, billed $99.99 every 12 months. An API is also available, returning matching sentences and URLs in JSON.
Who it is for
It suits students, teachers, researchers, content creators, and digital publishers who need to check writing. Teams integrating a checker into a CMS can use its API.
What is good
- Accepts pasted text and DOC, DOCX, TXT, or PDF files
- Reports sentence-level matches, sources, and similarity percentages
- Reports can be downloaded or shared
- Supports over 20 languages, according to the checker
- Offers an API with JSON results
What to know first
- Free searches are limited
- The maximum document length is 7,000 words
- File limits differ between the feature description and homepage
- Privacy policy permits specified personal-data sharing
Verdict
Check-Plagiarism combines text matching, similarity reporting, and an API, with a free online option subject to search limits. Check its file limits and privacy terms before relying on it for a particular workflow.
Check-Plagiarism plans and pricing
All plansCompared on AI plagiarism checkers
- Free plan
- Yes
- Source coverage
- web_only
- Maximum document words
- 7,000 words
- Supported file formats
- doc, docx, txt, pdf
- LMS integrations
- Yes
- API access
- Yes
- Report export
- AI writing check
- Yes
