Compare two texts side-by-side with instant diff highlighting. Word or character level, copy or download results. No signup—runs in your browser.
Configure how differences are displayed
Enter texts above to see the differences highlighted here.
Try clicking "Load Sample" to see an example
This tool runs entirely in your browser using:
All processing happens client-side. No data is sent to any server.
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A text compare tool is essential for writers, editors, developers, and teachers who need to identify differences between two text blocks. This free online compare text online tool instantly highlights additions, deletions, and modifications between any two texts, making it easy to spot changes, track revisions, and verify edits. Whether you're comparing document versions, proofreading content, checking code changes, or reviewing student submissions, this text difference checker provides accurate, visual comparisons with color-coded highlights.
Perfect for content editors tracking changes between drafts, developers comparing code versions, teachers reviewing student work, writers checking revisions, and anyone who needs to find differences in text. This text comparison tool processes all comparisons locally in your browser—no data is sent to servers, ensuring complete privacy and security. No signup required, no usage limits, and works on all devices.
A text compare tool (also called a diff checker or text difference checker) analyzes two text blocks and identifies all differences between them. It works by comparing text character-by-character or word-by-word, detecting additions (new text), deletions (removed text), and modifications (changed text). The tool highlights these differences using color coding: green for additions, red for deletions, and yellow/blue for modifications.
The tool uses advanced diff algorithms to find the optimal matching between texts, ensuring accurate detection of even complex changes. It supports both word-level and character-level comparison modes. Word-level mode groups changes by words (better for documents and prose), while character-level mode detects changes at the character level (better for code and precise text matching).
When it's helpful: comparing document versions to see what changed, proofreading to catch edits, reviewing code changes, checking translations, verifying data consistency, and tracking revisions. This find text differences tool provides instant visual feedback, making it easy to spot even subtle changes that might be missed during manual review.
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.
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.
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.
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.
Compare code snippets, configuration files, or scripts to see what changed. Developers use this to review code changes, compare file versions, and understand modifications. The character-level mode is particularly useful for code comparison, detecting even small syntax changes.
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.
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).
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.
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.
Text A:
Text B:
Highlights:
The tool highlights "quick" → "fast", "jumps" → "leaped", and "dog" → "canine" as modifications, showing exactly what changed in the sentence.
Text A:
Text B:
The tool detects multiple word changes: "example" → "sample", "demonstrate" → "show", "functionality" → "capabilities", and highlights the addition of "in various colors" at the end.
Text A (Code):
Text B (Code):
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.
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.
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.
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.
Yes, this tool is excellent for comparing code snippets, configuration files, scripts, and any text-based code. Use character-level mode for precise code comparison, as it detects even small syntax changes. The tool highlights additions, deletions, and modifications in code, making it easy to review changes, compare versions, and understand code differences. Perfect for developers reviewing commits, comparing file versions, and debugging code changes.
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.
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.
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.
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.
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.
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.
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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