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Text Compare
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Text Compare

Compare two texts side-by-side with line-by-line diff and word-by-word similarity analysis. Free text comparison tool.

Works Offline100% Free

Processed 100% locally in your browserPrivate & Safe

Text Compare runs entirely on your device using Web API standards. No data is ever uploaded to UtilixVerse servers.

Your Input
➔
Browser
➔
Result
No Server UploadsNo Account RequiredWorks OfflineZero Data Logging

Text Comparison Engine

Comparison Analysis

Similarity
41%
Match Score
Total Lines
A:16 / B:16
Line Counts
Additions
+8
New lines in B
Deletions
-8
Removed from A
Modified
3
Changed lines
Filter Lines:
Original (Text A)16 lines
1-function calculateTotal(items, discountRate = 0) {
2- let subtotal = 0;
3- for (let i = 0; i < items.length; i++) {
4- subtotal += items[i].price * items[i].quantity;
5~ }
6
7- const discount = subtotal * discountRate;
8~ const tax = (subtotal - discount) * 0.08;
9
10 return {
11- subtotal: subtotal,
12- discount: discount,
13- tax: tax,
14~ total: subtotal - discount + tax
15 };
16 }
Modified (Text B)16 lines
1~function calculateTotal(items, discountRate = 0, taxRate = 0.08) {
2+ // Calculate subtotal using reduce
3+ const subtotal = items.reduce((acc, item) => acc + item.price * item.quantity, 0);
4
5~ const discountAmount = subtotal * discountRate;
6+ const taxableAmount = subtotal - discountAmount;
7+ const taxAmount = taxableAmount * taxRate;
8+ const finalTotal = taxableAmount + taxAmount;
9
10 return {
11~ subtotal,
12+ discount: discountAmount,
13+ tax: taxAmount,
14+ total: Math.round(finalTotal * 100) / 100
15 };
16 }

Free Text Compare — Side-by-Side Diff & Word-by-Word Matching

Welcome to the UtilixVerse text compare tool. Compare two texts side by side with a line-by-line git-style diff and a word-by-word similarity report. Instantly spot additions, deletions, and rewordings between any two documents — ideal for contract review, translation verification, plagiarism detection, and code review.

Two Comparison Views

Line Diff — red/green git-style diff for structural changesinstant
Word-by-Word Report — paragraph alignment + token diffdetailed

How It Works

The Line Diff view compares texts line by line and highlights exactly which lines were added (green), removed (red), or unchanged — ideal for spotting formatting changes and code revisions. The Word-by-Word Report ignores line breaks entirely and analyses content: it normalises both texts, aligns paragraphs and sentences, and classifies every word as an exact match, near-miss (fuzzy), missing, or extra.

Common Use Cases

  • → Contract review — compare revisions before signing to catch every change
  • → Translation verification — confirm a reprint or translation matches the original
  • → Plagiarism detection — spot paraphrased content and unattributed borrowing
  • → Code review — review diffs without opening a full IDE or Git client
  • → Document editing — see exactly what changed between drafts

Tips for Best Results

  1. 1. Use Line Diff for code and formatting — it preserves exact line positions.
  2. 2. Use Word-by-Word Report for prose — it ignores line breaks and focuses on content.
  3. 3. The similarity percentage is reference-weighted — lower means more differences.
  4. 4. Near-miss matches (typos, OCR errors) still count as matches — focus on truly missing content.

100% private — everything runs in your browser with no uploads. Safe for confidential documents.

Frequently Asked Questions About Text Diff & Matching

How does the Text Diff & Matcher work?

The merged tool offers two comparison views. The Word-by-Word Report runs a 7-step pipeline entirely in your browser: it normalizes both texts (lowercase, unified dashes and quotes), splits them into paragraphs, sentences, and words, matches each reference paragraph to its best comparison paragraph, aligns sentences, and classifies every word as an exact match, a near-miss (fuzzy) match, a word missing from the comparison text, or an extra word present only in the comparison text. The Line Diff view is a classic red/green line-by-line diff (git-style) that is computed instantly from the pasted texts — no pipeline run required.

What is the difference between the Word-by-Word Report and the Line Diff?

The Line Diff compares texts line by line and highlights exactly which lines were added (green), removed (red), or left unchanged — ideal for spotting formatting and line-break changes, and for programmers comparing file revisions. The Word-by-Word Report ignores paragraph and line-break differences entirely and analyzes the content: overall similarity, bidirectional word coverage, sentence alignment, and a color-coded token diff that tolerates typos and OCR noise. Use Line Diff for a precise structural comparison and the Word-by-Word Report to verify that two documents contain the same words regardless of how they are laid out.

Is it private? Do my texts get uploaded?

No — everything runs 100% locally on your device. Your texts are compared right in your browser tab using JavaScript. Nothing is ever uploaded to a server, so it is safe to compare confidential documents, contracts, academic papers, or unpublished drafts. The tool also works offline after the page loads.

Does paragraph and line-break formatting matter?

Only in the Line Diff view, where lines are compared literally. The Word-by-Word Report is deliberately segmentation-agnostic: both texts are collapsed into a continuous sentence stream, so paragraph splits, line breaks, and blank lines are completely ignored. If one document splits the same content into five paragraphs and the other into two, the score is unaffected. Only the words and sentences matter — which makes it ideal for checking a printed or reformatted document against its source text.

What do the similarity percentages actually mean?

The Overall Similarity is a reference-weighted score. The Reference → Comparison coverage shows what percentage of the reference text's words were found in the comparison text — this is the key check for verifying that a document contains the same content as its source. Comparison → Reference coverage shows the reverse direction. A lower number in that direction usually means the comparison text contains extra content, not missing content. Near-miss spellings (like OCR typos) still count as matches, so a low score means genuinely different content rather than a formatting difference.

How do I read the color-coded word diff?

Inside each sentence, green words match exactly. Amber words are near-misses — the matched comparison word is shown in parentheses (for example, a typo like "prominant" matching "prominent"). Red words are present in the reference sentence but missing from the comparison sentence. Cyan words are extras that appear only in the comparison sentence. Use the category filter tabs (All, Exact Match, Minor Difference, Missing, Extra) to focus on one kind of difference at a time.

Can I compare OCR text or PDF content?

Yes — if you have already extracted the text from a PDF or an OCR run, simply paste it into the comparison box and compare it against your reference text. Word-by-word matching is very tolerant of OCR typos, because near-miss spellings count as matches. Direct PDF and image upload with built-in OCR is planned and will be added in a future update.

Is this tool really free?

Yes — completely free, with no registration, no sign-up, no premium tier, and no data collection. Both the matching engine and the line diff run locally on your device. You can copy the full JSON report, copy the git-style diff, or download either for offline analysis.

How to Use the Text Compare

Diff two blocks of text line-by-line — compare a draft against an edit, a config against a backup, or two versions of a file. Added and removed lines are highlighted so changes jump out.

Step-by-Step

  1. 1Paste version A on the left and version B on the right.
  2. 2Line-level differences highlight as added or removed.
  3. 3Scan the change summary to confirm exactly what moved.

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