Compare Two Texts Online — Side-by-Side Diff

Built for reviewing two versions of prose or documents: side-by-side or inline view, clear “modified” (old→new) highlighting, word or character granularity, plus copy and download. For a single unified diff stream and line-by-line mode, use our Text Diff tool.

What makes Text Compare different?

This tool is built around how people read two versions: either side-by-side columns or one inline flow, with green/red for pure add/remove and yellow/blue when something was replaced (old next to new). You can copy or download a human-readable report—workflow that patch-style diffs are not designed for.

When to use Text Compare vs Text Diff

Stay here for drafts, contracts, blog posts, student work, or any task where stakeholders expect two panes or a narrative export—not a single block of +/- markers.
Use Text Diff when you need a line-first view, hide unchanged lines, or a compact diff to paste into engineering notes—without side-by-side layout.

Comparison Controls

Configure how differences are displayed

Diff Granularity

View Mode

Text A

0 characters, 0 words

Text B

0 characters, 0 words

Diff Results

Enter texts above to see the differences highlighted here.

Try clicking "Load Sample" to see an example

Actions

How to Use

Paste or type text in both input boxes
Choose word or character-level comparison
Toggle between side-by-side and inline views
Copy or download the results for your records

Tech Stack

This tool runs entirely in your browser using:

Next.js

React framework

Tailwind

CSS framework

diff

Diff calculation library

All processing happens client-side. No data is sent to any server.

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Editors, teachers, and content teams use this text compare view when the goal is readability: two synchronized columns or one inline passage with clear “what replaced what.” It is deliberately separate from our Text Diff tool, which targets a single streamed diff and line-oriented review (configs, logs, snippets)—same family of math, different presentation.

Everything runs locally in your browser (inputs capped at 100,000 characters per side for responsiveness). No signup, no upload to a server—use it for redlines, version checks, and handoffs where a downloadable summary helps.

What Is a Text Compare Tool?

Here, “compare” means human-facing layout: you always see Text A and Text B in context (side-by-side or merged inline), not only a single patch block. Additions read as green, removals as red, and replacements as paired yellow (old) and blue (new)—so reviewers see intent, not just deltas.

Word mode tokenizes for natural language; character mode is for punctuation-heavy or code-like strings. Neither mode replaces a dedicated merge tool or version control UI; they help you inspect two snapshots quickly.

Reach for this page for lesson feedback, contract tweaks, marketing copy iterations, and localization checks. When you need line-by-line diff with “hide unchanged” and no two-pane layout, switch to Text Diff.

When to Use a Text Compare Tool

Version Comparison

Compare different versions of documents, articles, or content to see exactly what changed between revisions. Essential for content management, document control, and tracking changes over time. This compare two texts online tool makes it easy to review version history and understand the evolution of your content.

Proofreading

Compare original text with edited versions to verify that corrections were made correctly. Writers and editors use this to ensure all requested changes were implemented and to catch any unintended modifications. The visual highlighting makes it easy to spot corrections and verify proofreading accuracy.

Content Editing

Review edits made to articles, blog posts, or documents. Compare the original draft with the edited version to see all changes at a glance. This helps editors track modifications, verify edits, and ensure consistency across revisions.

Detecting Edits

Identify unauthorized or unintended changes in documents, contracts, or important text. Compare the original with a modified version to detect all edits, additions, and deletions. Useful for verifying document integrity and detecting tampering.

Short code or config snippets

Character mode works for small snippets, but long or line-sensitive files are often easier in Text Diff, where line mode and hiding unchanged lines match how patches are read.

How to Use This Text Compare Tool (Step-by-Step)

Pasting Text A and Text B

Paste your first text block into the "Text A" textarea and your second text block into the "Text B" textarea. You can paste text from any source: documents, web pages, code editors, or other applications. The tool accepts text up to 100,000 characters per input. The comparison happens automatically after a brief delay (debounced), or you can use the "Load Sample" button to see an example comparison.

What the Result Highlights

The tool highlights differences using color coding: green for added text (present in Text B but not in Text A), red for removed text (present in Text A but not in Text B), yellow for modified text (old version), and blue for modified text (new version). You can view results in two modes: side-by-side (Text A and Text B displayed next to each other) or inline (all changes shown in a single view with highlights).

How to Interpret Differences

Green highlights indicate new content added in Text B. Red highlights (with strikethrough) indicate content removed from Text A. Yellow/blue highlights indicate modifications where text was changed. Unhighlighted text is identical in both versions. The tool also provides statistics showing the total number of changes, additions, deletions, and modifications.

Copying or Exporting Results

Click the "Copy Results" button to copy the comparison results to your clipboard in a formatted text format. Use the "Download Results" button to save a detailed comparison report as a text file, including both texts, statistics, and a list of all changes. The downloaded file includes timestamps and comparison settings for your records.

Pro Tip: Use word-level mode for documents and prose (better readability), and character-level mode for code and precise text matching. Switch between side-by-side and inline views to see differences in the format that works best for you. Use the "Swap Texts" button to quickly reverse the comparison direction. The tool automatically processes changes as you type, providing real-time feedback.

Examples

Example 1: Simple Sentence Edit

Text A:

The quick brown fox jumps over the lazy dog.

Text B:

The fast brown fox leaped over the lazy canine.

Highlights:

The quick fast brown fox jumps leaped over the lazy dog canine.

The tool highlights "quick" → "fast", "jumps" → "leaped", and "dog" → "canine" as modifications, showing exactly what changed in the sentence.

Example 2: Paragraph with Word Changes

Text A:

This is an example text to demonstrate the diff tool functionality. You can compare any two texts to see differences highlighted.

Text B:

This is a sample text to show the diff tool's capabilities. You can compare any two texts to see differences highlighted in various colors.

The tool detects multiple word changes: "example" → "sample", "demonstrate" → "show", "functionality" → "capabilities", and highlights the addition of "in various colors" at the end.

Example 3: Code Snippet Diff

Text A (Code):

function greet(name) { return "Hello, " + name; }

Text B (Code):

function greet(name) { return `Hello, ${name}`; }

Using character-level mode, the tool detects the change from string concatenation (`"Hello, " + name`) to template literals (backtick Hello, dollar sign curly brace name curly brace backtick), highlighting the exact syntax differences in the code.

Frequently Asked Questions

Should I use Text Compare or Text Diff?

Use Text Compare (this page) for side-by-side or inline reading, modified (old→new) highlighting, and downloadable notes—think editorial and stakeholder review. Use Text Diff for a unified diff stream, line-first comparison, and toggling unchanged lines off—think engineering artifacts and dense logs.

How does text compare work?

The tool uses advanced diff algorithms to compare two text blocks character-by-character or word-by-word. It identifies the longest common subsequence between texts and highlights additions (green), deletions (red), and modifications (yellow/blue). The algorithm ensures optimal matching, detecting even complex changes accurately. This diff checker text tool processes all comparisons locally in your browser for instant results.

Does it ignore whitespace?

By default, the tool treats whitespace (spaces, tabs, line breaks) as significant characters and will highlight differences in whitespace. However, in word-level mode, whitespace is generally grouped with words, making it less prominent. For code comparison where whitespace matters, use character-level mode to see all whitespace differences. The tool preserves all formatting and spacing in the comparison results.

Is it case sensitive?

Yes, the tool is case-sensitive by default. It treats uppercase and lowercase letters as different characters. For example, "Hello" and "hello" will be highlighted as different. This is important for code comparison where case matters, and for accurate text matching. If you need case-insensitive comparison, you can preprocess your text using our text case converter to normalize case before comparing.

Can I compare code?

Yes, for short snippets character mode is precise. For longer files, line-oriented review, or hiding unchanged lines, prefer Text Diff—it matches how diffs are usually shared in engineering workflows.

Is this free?

Yes, this text compare tool is completely free to use with no signup required. There are no usage limits, no hidden fees, and no account creation needed. The tool works entirely in your browser, ensuring fast performance and complete privacy. All comparisons happen locally—no data is sent to servers. For related text processing needs, explore our our text utilities including the word frequency counter and remove extra spaces tool.

Does it work on mobile?

Yes, this text comparison tool is fully responsive and works on all devices, including smartphones and tablets. The interface adapts to smaller screens, and all features—text input, comparison modes, viewing options, copying, and downloading—are available on mobile browsers. Perfect for comparing texts on the go, whether you're reviewing documents, checking code, or comparing content.

Limitations & Tips

Case Sensitivity

The tool is case-sensitive, treating "A" and "a" as different characters. This is important for accurate comparison, especially for code. If you need case-insensitive comparison, normalize both texts to the same case before comparing using our text case converter.

Large Text Limits

Each text input is limited to 100,000 characters to ensure optimal performance. For larger texts, consider splitting them into smaller sections or using the tool multiple times. Very large comparisons may take longer to process, but the tool handles most practical use cases efficiently.

Formatting Differences

The tool detects all text differences including formatting changes (spaces, tabs, line breaks). In word-level mode, formatting is less prominent, while character-level mode shows all formatting differences. For documents with rich formatting, the tool compares the plain text content, not formatting styles.

What It Does Not Fix

This tool identifies differences but does not automatically merge, resolve conflicts, or suggest corrections. It's a comparison tool, not a merge tool. It shows you what's different, but you need to decide how to handle those differences. The tool also doesn't fix grammar, spelling, or content issues—it only highlights what changed.

Best Practices

For best results, use word-level mode for documents and prose, and character-level mode for code and precise matching. Use side-by-side view for comparing similar texts, and inline view for seeing all changes in one place. Copy or download results for your records. For comprehensive text editing, combine this tool with our other comparison and text tools like the word counter and online notepad for a complete text processing workflow.

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