Text Diff Tool

Q: What's the difference between line-by-line and word-by-word diff?

Line-by-line compares entire lines. Word-by-word compares individual words within lines, showing exactly which words changed.

Q: Is my text sent to a server?

No. All comparison happens client-side in your browser.

Q: What do the colors mean?

Green = additions, Red = deletions.

Q: Can I compare large texts?

Yes, the tool handles large texts efficiently in your browser.

Q: What does Ignore whitespace do?

It ignores differences in spaces, tabs, and trailing whitespace, showing only meaningful content changes.

Q: Can I compare code files?

Absolutely. Works great for code, config files, JSON, XML, SQL, and any text-based content.

Compare two texts side-by-side and see the differences highlighted. Supports line-by-line and word-by-word comparison.

Original Text

Modified Text

Ignore WhitespaceIgnore Case

What is a Text Diff Tool?

A text difference checker (or diff tool) compares two pieces of text and highlights the differences between them. It's an essential tool for developers, writers, editors, and anyone who needs to track changes between document versions. Our text comparison tool shows additions in green, deletions in red, and unchanged lines clearly, making it easy to spot exactly what changed. ToolMagic's diff tool supports both line-by-line and word-by-word comparison modes, giving you the right level of granularity for your needs. You can also toggle options to ignore whitespace or case differences when they're not relevant. The tool provides statistics showing how many lines were added, removed, changed, and left unchanged. Everything runs 100% in your browser — your text is never sent to any server, making it safe for comparing sensitive documents, code, or confidential content. Whether you're reviewing code changes, comparing contract versions, or checking document edits, this free online diff tool gives you clear, instant results.

How to Use the Text Diff Tool

Enter original text: Paste or type the original (first) version of your text in the left panel.
Enter modified text: Paste or type the modified (second) version in the right panel.
Click Compare: Hit the "Compare" button to generate the diff.
Choose diff mode: Switch between line-by-line and word-by-word comparison.
Toggle options: Enable "Ignore whitespace" or "Ignore case" as needed.
Review results: Additions are highlighted in green, deletions in red, and stats are shown above the diff.

Features

Side-by-side view: See both texts with differences highlighted for easy visual comparison.
Color-coded differences: Additions in green, deletions in red, for instant recognition.
Line-by-line diff: Compare texts at the line level for structural changes.
Word-by-word diff: Compare at the word level for fine-grained difference detection.
Diff statistics: See counts of lines added, removed, changed, and unchanged.
Ignore whitespace: Toggle to skip whitespace differences when they're not important.
Ignore case: Toggle to treat uppercase and lowercase as the same.
100% client-side: Your text is never sent to a server. Complete privacy guaranteed.

Use Cases

Code review: Compare two versions of code to identify changes before committing.
Document editing: Track changes between document drafts for editing and proofreading.
Contract comparison: Compare legal document versions to find modified clauses or terms.
Configuration files: Diff config files to find differences between environments.
Content updates: Compare website content versions to track editorial changes.
Plagiarism checking: Compare two texts to find similarities and differences.

Tips & Tricks

Use "Ignore whitespace" when comparing code that may have different formatting but identical logic.
Word-by-word mode is better for prose and documents; line-by-line is better for code.
Format your SQL with the SQL Formatter before comparing to get cleaner diffs.
Use the Base64 Decoder to decode encoded text before comparing.
Copy the diff results for inclusion in code reviews or change logs.

Text Diff Tool vs Alternatives

Unlike desktop diff tools that require installation, or server-based services that upload your content, ToolMagic's text diff tool runs entirely in your browser for maximum privacy. It's free with no limits, requires no signup, and provides both line and word diff modes with options to ignore whitespace and case — features that many free alternatives lack.

Frequently Asked Questions

What's the difference between line-by-line and word-by-word diff?

Line-by-line compares entire lines and marks whole lines as added or removed. Word-by-word compares individual words within lines, showing exactly which words changed — useful for prose and documents.

Is my text sent to a server?

No. All comparison happens client-side in your browser using JavaScript. Your text never leaves your device.

What do the colors mean?

Green highlights indicate additions (text present in the modified version but not the original). Red highlights indicate deletions (text present in the original but removed in the modified version).

Can I compare large texts?

Yes, the tool handles large texts efficiently. However, very large documents (over 100,000 lines) may take a moment to process since everything runs in your browser.

What does "Ignore whitespace" do?

When enabled, differences in spaces, tabs, and trailing whitespace are ignored, so only meaningful content changes are highlighted.

Can I compare code files?

Absolutely. The tool works great for comparing code, configuration files, JSON, XML, SQL, and any other text-based content.

Related Tools

Explore more free tools on ToolMagic: use the SQL Formatter to beautify SQL queries, the JSON Formatter to format JSON, or the Word Counter to analyze text.