Overview

Users can paste text, submit a URL, or upload a document, making Plagiarisma adaptable to both finished files and material already online. The checker says it supports more than 190 languages. That breadth may help multilingual writers, though language count alone does not establish the quality of matching in any particular language.

Plagiarism checking is available through the online checker, a Windows desktop download, and a Google Docs add-on. The company says it does not store private texts in public databases, a meaningful assurance for students and writers handling client work, but not a complete account of data handling.

Key features

Uploads cover PDF, DOCX, RTF, TXT, HTML, PPTX, XLSX, XLS, FB2, ODT, EPUB, and DOC. This range accommodates common office documents as well as ebook formats, reducing the need to convert files before checking. Source coverage includes web, academic, and publisher material; the checker’s stated purpose also covers books and academic papers.

The Windows desktop page describes plagiarism scanning alongside an AI content detector, AI paraphrasing tool, and APA citation generator. The listed download is version 2.0 for .NET on Windows x86/x64. Those extras make the desktop edition more appealing to writers who need citation or AI-related tools as well as originality checks, though they are tied to the Windows option.

The Google Workspace Marketplace add-on brings plagiarism checking, paraphrasing, summarizing, and AI detection into Docs. It allows five free document scans per day, with paid features offered through a monthly subscription. That daily cap is workable for occasional checking but may constrain frequent classroom or editorial use.

Plagiarisma also offers LMS integrations and API access, which may suit institutions or services seeking a way to incorporate checking into existing workflows.

Pricing

Plagiarisma uses a freemium model. The Windows desktop plan is free: 0.00 USD per free, for Windows 11, 10, 8.1, 8, and 7. That makes it a no-cost option for Windows users, but does not establish a scan quota or other limits for the desktop plan.

The Docs add-on provides five free scans per day, while its paid features require a monthly subscription. The premium membership FAQ says orders are refundable within three days of purchase; trial orders are not refundable. Readers considering a trial should treat that exclusion as important, and check the subscription terms before paying.

Platforms

Plagiarisma supports web and Windows use. Its Google Docs add-on is another route for Workspace users, and the stated LMS integrations and API access may extend its reach into institutional or software workflows. The desktop download supports Windows x86/x64.

Who it's for

Students, bloggers, and freelance writers are the clearest fit: they can submit text in several ways, work across many file formats, and use the free Windows option or Docs add-on for occasional checks. Windows writers who also want paraphrasing, AI detection, or APA citation assistance may value the bundled desktop tools.

It is less compelling for users who need a clearly defined high-volume allowance or detailed subscription pricing before choosing. The daily free cap is explicit for Docs, but no equivalent desktop quota is given, and the paid add-on features are subscription-based.

Pros and cons

Pros: Paste, URL, and file submission options accommodate different kinds of source material.
Pros: Broad format support and more than 190 stated languages make it flexible for varied writing workflows.
Pros: The free Windows plan and Docs add-on’s five daily free scans provide no-cost ways to get started.
Cons: The five-scan daily allowance applies to the Docs add-on, so it may be restrictive for regular or batch checking.
Cons: Paid Docs features use a monthly subscription, and trial orders are not refundable.
Cons: The company’s privacy assurance addresses public databases, not other aspects of data handling.

Alternatives

Noplag is worth considering when a reader wants a stated free allowance of three checks per month, with up to 2,500 words per check, and web plus Common Crawl coverage; its listed platforms also include Linux, macOS, Windows, API, and self-hosting.

Plagium may suit mobile users who want Android or iOS access, or those who prefer a stated five free daily searches with a 4,000-character limit; its free account excludes Deep Search and API access.

PlagAware is a fit for readers who want a free monthly allowance of 10 pages and monitoring for up to 30 URLs with a Content Protection Banner.

PrePostSEO Plagiarism Checker may appeal to users seeking a wider toolset across web, mobile, desktop, and API platforms, with its Basic annual plan priced at 4.17 USD per year.

Copyscape is an alternative for readers prioritizing URL scans and site protection; its free scans are limited per website and return up to 10 results per search.

Plagiarism Checker X is a Windows-only option with a free Basic plan and a Professional license priced at 39.95 USD once for perpetual use.

Proofademic may suit users who want a short trial combining multilingual AI detection, plagiarism checking, and report export; its free offer includes 1,000 words and a three-day trial.

SmallSEOTools Plagiarism Checker is another web, extension, and API option, with a free allowance of up to 1,000 words per scan.

Browse AI Plagiarism Checkers, Plagiarism Checkers, or Plagiarism Detection Software to compare more options by category.

Verdict

Choose Plagiarisma if you want flexible text and document submissions, broad language and format support, and a free Windows route, especially if its Docs and desktop writing tools fit your workflow. Look elsewhere if you need a clearly stated high-volume quota or want fuller clarity on paid subscription terms before committing.

	Crossref Similarity Check	Plagiarisma
Free plan	No	Yes
Free trial	No	No
Paid from	$3.33/mo	Free
Open source	No	No
Platforms	api, Web	Web, Windows
Free plan	No	Yes
Web source matching	Yes	—
Academic source matching	Yes	—
Report export formats	PDF	—
API access	Yes	Yes

Crossref Similarity Check vs Plagiarisma

Crossref Similarity Check

Plagiarisma