Plagiarism Checker

Compare texts • Highlight overlaps • Estimate similarity & uniqueness

Document title (optional)

Main text to check

For more meaningful results, provide at least a few sentences or a full paragraph.

Reference sources (one or more)

Examples: other students’ work, online articles (pasted), previous drafts, or any text you want to compare against. This plugin does not automatically crawl the web.

Ignore case when comparing Ignore most punctuation

Minimum phrase length (words)

Shorter phrases are easier to match by accident. 4–5 words is a good starting point.

Result

Heuristic comparison only. Results can be wrong and reflect only the sources you provide.

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Paste your main text and one or more reference sources, then click Check Plagiarism to see similarity estimates, per-source overlap, and matched phrases.

Saved Checks

Saved locally in this browser. Do not store confidential material on shared devices.

No saved checks yet. Run a comparison and click Save Result to keep it here.

Plagiarism Checker – Source-Based Plagiarism Detection Tool

Plagiarism Checker from SEO Tools Fix is a professional, browser-based plagiarism checker that helps writers, educators and content teams compare documents against specific reference sources. Instead of crawling the entire internet, it focuses on the texts you paste into the tool, highlighting overlapping phrases and providing clear similarity and uniqueness estimates. All analysis runs client-side in your browser, so your drafts and reference materials are not sent to external servers by this plugin.

Compare Your Text Against Chosen Sources with Phrase-Level Analysis

This plagiarism checker is ideal when you already know which documents you want to compare: previous assignments, internal reports, web articles or training materials. You simply paste the main text to be checked, add one or more reference sources, and choose a minimum phrase length. The tool converts each document into overlapping word sequences (n‑grams) and identifies which of those phrases appear in both your main text and the sources. The result is an approximate similarity percentage and a complementary uniqueness score.

A per‑source breakdown shows how much overlap exists with each reference, helping you quickly identify where language may have been reused too closely. In addition, a list of the most significant matching phrases makes it easier to review context, distinguish between acceptable quotation or shared jargon, and detect potentially problematic copying that requires revision or better citation.

Privacy‑Respecting Plagiarism Checker for Writers, Students and Teams

Because all calculations are performed locally via JavaScript, the plugin suits privacy‑sensitive environments where sending documents to third‑party APIs is not acceptable. Saved checks are stored only in the user’s browser as lightweight summaries, never as full texts. This makes the tool particularly useful for tutors, SEO agencies, editors and internal reviewers who need a quick, transparent similarity checker without complex infrastructure.

While the percentages are helpful indicators, they are not legal or academic verdicts. The checker should be used alongside human judgment, citation best practices and institutional guidelines. When results show high similarity, you can revisit the highlighted segments, paraphrase more thoroughly or add explicit references so that your final work reflects genuine originality and proper attribution.

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