Freedom251 › AI Plagiarism Checkers
Check-Plagiarism
What Check-Plagiarism is
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 a month; Annual costs $8.33 a month, billed $99.99 every 12 months. An API can return matching sentences and URLs in JSON.
Who it suits
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 it does well
- 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.
Limits
Free online use has limited searches, and registering can increase the limit. The Monthly plan includes 35,000 words, 116 pages, and 20,000 words per search; the Annual plan includes 450,000 words, 1,500 pages, and 20,000 words per search. Document-count guidance says up to five documents at once in one description, while the homepage says free users can select at most three and premium users up to 20 per search.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| API Basic | 30 Days · 10,000 queries/requests | $10 a month |
| API Company | 30 Days · 35,000 queries/requests | $14.99 a month |
| Monthly | monthly · 35,000 words · 116 pages · 20,000 words/search · 1,500-word rephraser · deep search · summarizer · grammar checker · WordPress plugin · no ads · 2× faster · detailed reports · APIs | $14.99 a month |
| Semi-Annual | $100 billed every 6 months · 200,000 words · 666 pages · 20,000 words/search · 2,000-word rephraser · deep search · summarizer · grammar checker · WordPress plugin · no ads · 2× faster · detailed reports · APIs | $16.66 a month |
| API Business / Colleges / Universities | One Year · 600,000 queries/requests · 24/7 support | $250 a year |
| Weekly | weekly · 10,000 words · 34 pages · 7,000 words/search · 1,000-word rephraser · deep search · summarizer · grammar checker · WordPress plugin · no ads · 2× faster · detailed reports · APIs · dedicated manager | $4.99, paid once |
| API Business | 30 Days · 50,000 queries/requests · 24/7 support | $50 a month |
| API Basic Yearly Plan | One Year · 60,000 queries/requests | $50 a year |
The first 8 of 10 plans, as check-plagiarism.com lists them, read 28 Sept 2026. The maker's own page has the final word. Every plan
Getting started
- Visit the Check-Plagiarism website
- Paste or type text, or upload a DOC, DOCX, TXT, or PDF file
- Run a free online check or register to increase the search limit
- Choose a paid plan if you need its listed word or API quotas
- Download or share a report, or use the API for a CMS integration
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.
Questions
Is Check-Plagiarism free?
Yes. The site describes a free online checker, with limited searches; registered accounts can increase the limit.
What does the Monthly plan cost?
The Monthly plan is $14.99 a month and includes 35,000 words, 116 pages, and 20,000 words per search.
What does the Annual plan cost?
The Annual plan is $8.33 a month, billed 99.99 USD every 12 months. It includes 450,000 words, 1,500 pages, and 20,000 words per search.
Which file formats can I upload?
The checker accepts DOC, DOCX, TXT, and PDF files. The listed maximum document length is 7,000 words.
Does it offer API access?
Yes. The API can integrate with any CMS and returns matching sentences and URLs in a detailed JSON response.
Which platforms are named for the API?
The API page names WordPress, widgets, and Android among supported platforms.
Facts from Check-Plagiarism's own pages
- AI matching
- The checker says its AI can identify paraphrases and slightly edited text in addition to exact matches. · check-plagiarism.com, 28 Sept 2026
- Android app
- The Android listing links the app to check-plagiarism.com, supports Word, text and PDF uploads, shows source URLs and similarity percentages, and contains ads and in-app purchases. · play.google.com, 15 Oct 2026
- Android developer facts
- Google Play identifies the developer as Enzipe Apps at HR Tower, Faisalabad, Pakistan, with support contact [email protected]. · play.google.com, 15 Oct 2026
- API availability
- The vendor offers APIs for registered users to embed plagiarism checking in CMS, CRM or LMS systems. · check-plagiarism.com, 15 Oct 2026
- API data claim
- The API page states that text sent through APIs is not stored in the vendor database and that responses arrive within seconds. · check-plagiarism.com, 15 Oct 2026
- API endpoints
- Documented endpoints include /apis for account status and /apis/checkPlag for article checking. · check-plagiarism.com, 15 Oct 2026
- API examples
- Public documentation provides cURL and PHP cURL examples but does not list official SDK packages. · check-plagiarism.com, 15 Oct 2026
- API protocol
- The API documentation requires POST requests, an API-key parameter and returns JSON; GET requests are unsupported. · check-plagiarism.com, 15 Oct 2026
- API request limit
- The documented full-article API accepts up to 5,000 words per request, requiring longer text to be split. · check-plagiarism.com, 15 Oct 2026
- API response
- The API returns a detailed JSON response with sentences and URLs matching the submitted text. · check-plagiarism.com, 28 Sept 2026
- Bulk files
- The site says users can check up to five documents at once, while its interface separately states free users may select three files and premium users 20 files per search. · check-plagiarism.com, 15 Oct 2026
- Documentation depth
- The public API guide covers registration, key retrieval, request method, endpoints, parameters and sample responses, but no self-hosting instructions are shown. · check-plagiarism.com, 15 Oct 2026
- File formats
- The web checker accepts DOC, DOCX, TXT and PDF uploads. · check-plagiarism.com, 15 Oct 2026
- File limit
- The feature description says up to five documents can be checked at once, while the homepage says free users can select at most three files and premium users up to 20 per search. · check-plagiarism.com, 28 Sept 2026
- Founded evidence
- The opened company and review pages do not state a founded year; the WordPress profile shows membership since November 2016. · profiles.wordpress.org, 15 Oct 2026
- Free use
- The homepage describes a free online checker, and the site says visitors have limited searches while registered accounts can increase the limit. · check-plagiarism.com, 28 Sept 2026
- GetApp pricing
- GetApp lists a starting price of $4.99 per month and both a free version and free-trial fields for the product. · getapp.com, 15 Oct 2026
- Input methods
- Users can paste or type text, or upload DOC, DOCX, TXT, or PDF files for checking. · check-plagiarism.com, 28 Sept 2026
- Integrations
- The API page says the API can integrate with any CMS and names WordPress, widgets, and Android among supported platforms. · check-plagiarism.com, 28 Sept 2026
- Intended users
- The maker identifies students, teachers, researchers, content creators, and digital publishers as users of the service. · check-plagiarism.com, 28 Sept 2026
- Languages
- The checker page claims support for over 20 languages. · check-plagiarism.com, 28 Sept 2026
- Language support
- The product advertises support for more than 20 languages and exposes numerous localized interfaces. · check-plagiarism.com, 15 Oct 2026
- Licence
- The opened vendor pages describe a hosted commercial service and do not state an open-source licence. · check-plagiarism.com, 15 Oct 2026
- Limit: ads and free limits
- Capterra reviewers complain about irritating advertisements and limits in the free version that require splitting longer articles. · capterra.com, 15 Oct 2026
Where Check-Plagiarism stands on Freedom251
- AI Plagiarism Checkers#2 of 26