Check-Plagiarism checks submitted writing and returns sentence-level matches, similarity percentages, and sources. Users can paste or type text, or upload DOC, DOCX, TXT, or PDF files; the listed maximum document length is 7,000 words. The service says its AI can find paraphrases and lightly edited text as well as exact matches, and it claims to check billions of web pages alongside academic databases and publications. It claims support for more than 20 languages. Reports can be downloaded or shared. The site describes a free online checker with limited searches; registered accounts can increase the limit. File limits are not consistent across the service: one description allows five documents at once, while the homepage says free users can select at most three files and premium users up to 20 per search. Monthly costs 14.99 USD per month; Annual costs 8.33 USD per month, billed $99.99 every 12 months. An API can return matching sentences and URLs in JSON.
Who it is for
The service is aimed at students, teachers, researchers, content creators, and digital publishers who need to check submitted text. Its API may suit users integrating plagiarism checks into a CMS or other supported platform.
What is good
- Accepts text and DOC, DOCX, TXT, or PDF files.
- Reports sentence-level matches, sources, and similarity percentages.
- Reports can be downloaded or shared.
- Offers an API with matching sentences and URLs.
What to know first
- Free searches are limited.
- File limits differ between the feature description and homepage.
- Maximum document length is 7,000 words.
Verdict
Check-Plagiarism combines file and pasted-text checks with match reports and API access. Before choosing a plan or workflow, note its stated file-limit discrepancy and the 7,000-word document maximum.
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
