TE

Text Similarity Checker

Compare two texts instantly to find matching words, duplicate sentences, content similarity, and differences with a detailed analysis report. Free and instant.

100% Free
Text 1 (Original)
Text 2 (Compare)
Extracting text…

Similarity Analysis

0%

Similarity Percentage

Sequence-based match between both texts

0%

Overall Match Score

Blends word, sentence & sequence similarity

Matching Words

Matching Sentences

Duplicate Paragraphs

Different Words

Unique to Text 1

Unique to Text 2

Common Keywords

No significant shared keywords found.

Live Statistics

Metric Text 1 Text 2 Difference

Content Insights

Unique Content (T1)

Unique Content (T2)

Common Content

Missing from T2

Missing from T1

Content Overlap

Text Differences

Similar Writing Ratio

Side-by-Side Comparison

Equal Added Removed Modified Partial
Paste both texts to see a line-by-line comparison.

Difference Detection

Removed Added Modified Partial Match
Texts are very large — showing simplified line-level highlighting instead of word-level.

Text 1

Text 2

Duplicate Content Analysis

Dup. Sentences

Dup. Paragraphs

Dup. Words

Repeated Phrases

Duplicate Sentences

Repeated Phrases

Phrase Matching

No matching phrases found. No long shared phrases (4+ words) found.

Export Report

100% Free

All tools are completely free to use.

Privacy First

Your texts never leave your browser.

Live Comparison

Results update instantly as you type.

Large Text Support

Handles full articles and long pages.

What is Text Similarity Checker?

Text Similarity Checker is a free online tool that compares two pieces of text and shows a detailed similarity analysis: a similarity percentage, overall match score, matching and unique words, duplicate sentences and paragraphs, and shared keywords and phrases.

See exactly what changed with a line-by-line side-by-side comparison and a word-level difference view that highlights added, removed, modified, and partially matching content in different colors. Upload TXT, DOCX, or PDF files, ignore case, punctuation, spacing, numbers, line breaks, or HTML tags, and export your findings as a CSV, TXT, or PDF report. All comparison happens locally in your browser — neither text is ever uploaded anywhere.

How to Use Text Similarity Checker

  1. 1

    Add the first text

    Paste your original into the left box, or upload a TXT, DOCX or PDF file.

  2. 2

    Add the second text

    Paste or upload the text you want to compare it against on the right.

  3. 3

    Set what to ignore

    Choose whether to ignore case, punctuation, spacing, numbers, line breaks or HTML tags so formatting differences do not count as real ones.

  4. 4

    Review and export

    Read the similarity score, matching words and duplicate sentences, switch between the side-by-side and word-level views, then export the report as CSV, TXT or PDF.

Frequently Asked Questions

It is how much of the two texts overlap, measured across shared words, sentences and phrases rather than a single crude match. 100% means the texts are effectively identical; anything above roughly 70% usually means one was derived from the other; under 30% they are largely independent pieces of writing.
No, and the difference matters. This tool compares two texts you supply against each other. A plagiarism checker compares your text against a crawled index of the whole web. Use this to check a rewrite against an original, two drafts against each other, or a submission against a source you already have.
The side-by-side view lines the two texts up and shows which lines changed, which is best for reviewing edits. The word-level view highlights individual added, removed, modified and partially matching words in colour, which is best for spotting small rewrites designed to look different.
Because those differences usually are not real differences. Turning them off stops a change from "Hello, world" to "hello world" registering as a rewrite, so the comparison reflects meaning rather than formatting noise.
No. Both texts — including any TXT, DOCX or PDF you upload — are compared entirely in your browser. Neither document is sent to our servers, which makes the tool safe for contracts, coursework and unpublished drafts.

Ignore Options

Ignore Case

Treat SEO and seo as the same word

Ignore Extra Spaces
Ignore Punctuation
Ignore Numbers
Ignore Line Breaks

Compare as one continuous paragraph

Ignore HTML Tags

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Why Compare Text?

  • Spot duplicate or plagiarized content instantly
  • Track exact changes between document revisions
  • Verify rewritten or paraphrased content is unique enough
  • Check for accidental duplication across your own pages

Your files are safe with us!

All comparison happens locally in your browser. Neither text is ever uploaded or stored on any server.

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