Is my content uploaded or stored?

No, all comparisons happen locally in your browser. Your text remains private and secure.

How accurate is the similarity score?

The tool uses Jaccard similarity for both word and character comparisons. Higher scores mean greater duplication or overlap.

Can this tool detect paraphrasing?

Yes. It uses character and word-based logic to spot both direct copying and paraphrased text segments.

Does this check online sources or just two texts?

This compares only the two texts you enter. It does not crawl or check online databases.

Plagiarism / Similarity Checker – Free Online Text Comparison Tool

Plagiarism / Similarity Checker is a free, private, and browser-based tool that helps you detect content duplication between two texts. Whether you’re a student, writer, or website owner, this tool compares text A and text B side by side, calculating their similarity percentage using the Jaccard algorithm for both words and characters.

What Is a Plagiarism Checker?

A plagiarism checker identifies whether one piece of text overlaps with another. It scans two blocks of content and finds identical or highly similar phrases, helping you determine if text has been copied or paraphrased. This tool runs entirely in your browser — no data is sent to any server, keeping your content completely private.

How to Use the Plagiarism / Similarity Checker

Paste your original content in the Text A box.
Paste the text you want to check in the Text B box.
Adjust the character and word shingle size if needed for stricter or looser matching.
Click the Check Similarity button to get instant results.

The tool highlights overlapping text in both boxes and displays an overall similarity score with character-level and word-level Jaccard percentages.

Why Use an Online Similarity Checker?

Writers and Bloggers – Ensure your content is unique before publishing.
Students – Check your assignments for accidental duplication.
SEO Professionals – Detect content reuse and maintain originality in web pages.
Editors – Verify that submissions are original and properly paraphrased.

How It Works

This plagiarism checker uses Jaccard similarity, a mathematical method that compares overlapping sets of characters and words between two texts. The tool calculates how much the two sets intersect versus their total unique elements. The higher the percentage, the more similar the two texts are. It can detect both direct copy-paste and paraphrased similarities.

Features

Works entirely in your browser (no server uploads)
Free to use with no signup required
Detects character- and word-level similarity
Adjustable sensitivity (shingle size)
Instant highlighting of overlapping phrases

Frequently Asked Questions

Is this plagiarism checker free?

Yes, it’s completely free to use without any login or subscription.

Is my text stored or uploaded?

No. All text processing happens locally in your browser. Nothing is stored or sent online, ensuring total privacy.

What does the similarity percentage mean?

The percentage shows how much of Text B overlaps with Text A. A higher value indicates stronger similarity or duplication.

Can this detect paraphrasing?

Yes. The combination of character and word-based comparison helps catch partial and paraphrased similarities.

Does this tool check against online sources?

No. This version compares two text inputs only. It does not crawl or check online databases.

Conclusion

This Plagiarism / Similarity Checker is a reliable, fast, and private way to compare two texts for similarity. Whether you’re verifying originality, editing content, or testing paraphrasing accuracy, this tool provides instant, visual feedback without compromising privacy.