SmallSEOTools Plagiarism Checker

Overview

Rather than returning only a similarity score, the checker identifies exact and partial matches, flags sentences and links to matched sources. It also says it detects paraphrases and synonym substitutions, which can help reviewers look beyond copied passages. That makes the report more useful for deciding what needs attention, though a match still calls for human judgment.

Users can paste text, upload a local or cloud file, or submit a URL. Supported uploads include DOC, DOCX, TXT, TEX, RTF, ODT and PDF. Checks are available in more than 25 languages. The service says submissions travel over a secure connection and remain confidential after analysis.

Key features

Reports and citation controls

Reports combine a duplication score with sentence-level flags and source URLs, giving users a route to inspect potential matches rather than rely on a single percentage. Quotations, references and other properly attributed text can be excluded from the similarity score, a useful safeguard for academic and citation-heavy work.

Export and integrations

Completed reports export to PDF or Word, convenient for sharing or keeping a review record. A WordPress plugin checks content from the dashboard but requires an API key in its settings. The documented API covers plagiarism checks and account status; it is not presented as a general-purpose writing API.

Pricing

The free plan costs 0.00 USD per free and allows up to 1,000 words per scan. That is a practical fit for short passages or occasional spot checks, but longer assignments need to be split or handled on a paid plan.

The Monthly plan costs 9.80 USD per month, billed monthly. It includes 35,000 + 5,000 words, one month of validity, a 30k-word limit, the WordPress plugin and API. The Yearly plan costs 94.08 USD per year, billed yearly, with 480,000 words, one year of validity, a 30k-word limit, the plugin and API. The yearly option lowers the effective monthly cost for regular use, but commits the buyer for a year; both paid plans specify 0 user seats, so they do not suit a multi-seat workflow as described.

Enterprise & LMS has custom pricing and includes API access, turnkey LMS integrations, enterprise-grade security, customer permissions, a dedicated customer success team and dedicated support. It is the relevant tier for organizations needing managed integrations and permissions rather than a solo checker.

Platforms

The product is offered on web, through an extension, and via API. Its WordPress plugin extends checks into the publishing dashboard. These options cover browser-based and publishing workflows, while the API is specifically for plagiarism checks and account status.

Who it's for

Students, teachers, researchers and academics can use the source-linked reports and citation exclusions to review submitted work. Writers, bloggers and digital marketers can check drafts or URL content before publication. The free word cap is best for brief checks; people reviewing longer work regularly should compare the 30k-word per-search ceiling and total quotas with their volume. SmallSEOTools says it was founded in 2010 by Tausif Akram and operates from London, England.

Pros and cons

• Pros: Paste, file and URL submissions accommodate different kinds of content without requiring a single document workflow.
• Pros: Sentence flags, exact and partial matches, source URLs and citation exclusions make reports more actionable than a score alone.
• Pros: PDF and Word exports, a WordPress plugin and a plagiarism-focused API support review and publishing workflows.
• Cons: The free plan stops at 1,000 words per scan, restrictive for full-length papers or articles.
• Cons: Paid plans have 0 user seats, making them a poor fit for shared access despite their plugin and API features.
• Cons: The Yearly plan requires annual billing, while the Monthly plan's quota and 30k per-search limit still require buyers to match usage carefully.

Alternatives

For more free words in a defined monthly allowance, Noplag offers three checks per month at up to 2,500 words per check, with public web and Common Crawl matching. PlagAware is another freemium web/API option, with a free allowance of 10 pages per month and monitoring for up to 30 URLs. Choose PlagiarismCheck.org if pay-per-page pricing without monthly fees better suits occasional checking; its Basic plan is 5.99 USD per once for 20 pages.

Readers comparing plagiarism checking with AI detection can consider Copyleaks AI Detector, which combines those functions and lists 30+ AI-detection languages on its Personal plan. Quetext AI Detector has a free plan with up to 1,000 words for both its AI detector and plagiarism checker. PlagiarismSearch offers one-time submission packages, including a Light package with one plagiarism and one AI submission. PrePostSEO Plagiarism Checker supports Android and iOS as well as desktop platforms, making it an option for readers who want mobile apps. Originality.ai may suit users focused on AI detection: its free Basic plan provides AI detection only, with three scans per day and up to 2,000 words per scan.

Browse Plagiarism Checkers, Plagiarism Detection Software and AI Plagiarism Checkers for more options.

Verdict

SmallSEOTools Plagiarism Checker is a sensible choice for individuals who want flexible submissions and source-rich reports, especially when citation exclusions, exports or WordPress/API access matter. Its free 1,000-word cap is useful for short checks, but longer or shared-team workflows should look elsewhere or confirm that the paid quotas and zero-seat plans fit before committing.