Diff Checker

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Spaces Trim

ORIGINAL

MODIFIED (Result)

1 Paste texts above 2 Click Check Diff

or press Ctrl+Enter

0 changes

Free Online Text Diff Tool - Compare Text & Code Side by Side

Our free text diff tool helps you instantly compare two texts or code files and find differences. Whether you're a developer comparing code versions, a writer tracking document changes, or anyone needing to spot differences between two pieces of text, this online diff checker makes it easy with side-by-side comparison, syntax highlighting, and merge capabilities.

✓ Key Features of Our Text Comparison Tool

📊 Side-by-Side Comparison

View original and modified text in parallel columns with synchronized scrolling for easy comparison.

🎨 Syntax Highlighting

Additions highlighted in green, deletions in red, and word-level changes clearly marked.

🔀 One-Click Merge

Easily merge changes from left to right or right to left with interactive arrow buttons.

📄 Export to PDF

Save your diff report as a PDF document for documentation or sharing with team members.

✨ Code Formatting

Auto-format JavaScript, HTML, and CSS code with Prettier integration before comparing.

🌙 Dark Mode

Switch between light and dark themes for comfortable viewing in any environment.

? How to Use the Text Diff Checker

1. Paste Original Text: Enter or paste your original text in the left "ORIGINAL" box.
2. Paste Modified Text: Enter or paste the changed version in the right "MODIFIED" box.
3. View Differences: The tool automatically highlights all additions (green) and deletions (red).
4. Navigate Changes: Use arrow buttons or keyboard shortcuts (J/K) to jump between changes.
5. Merge or Export: Click merge arrows to accept changes, or export your diff report as PDF.

💼 Who Uses This Text Comparison Tool?

👨‍💻 Developers & Programmers

Compare code versions, review pull requests, debug changes between file versions.

✍️ Writers & Editors

Track document revisions, compare drafts, review editorial changes.

⚖️ Legal Professionals

Compare contract versions, spot changes in legal documents and agreements.

🎓 Students & Teachers

Check plagiarism, compare essay versions, review assignment submissions.

📋 Project Managers

Compare requirements documents, track specification changes.

🔧 System Administrators

Compare configuration files, track server setting changes.

★ Why Choose Our Online Diff Tool?

✅ 100% Free No registration, no payment, no limits	✅ Works Offline Runs entirely in your browser
✅ Privacy Focused Your text never leaves your device	✅ Mobile Friendly Works on phones and tablets
✅ Instant Results Real-time diff as you type	✅ Keyboard Shortcuts Navigate quickly with hotkeys

⌨ Keyboard Shortcuts

J or ↓	Next change
K or ↑	Previous change
Ctrl + I	Toggle input panels
Ctrl + Z	Undo last merge
Ctrl + Y	Redo
Ctrl + D	Toggle dark mode
F11	Toggle fullscreen

? Frequently Asked Questions (FAQ)

What is a text diff tool?

A text diff tool (also called a text comparison tool or diff checker) is a software utility that compares two pieces of text and identifies the differences between them. It highlights additions, deletions, and modifications, making it easy to see what has changed between two versions of a document, code file, or any text content.

Is this text diff tool free to use?

Yes, our text diff tool is completely free to use with no registration required. There are no usage limits, no watermarks, and no hidden fees. You can compare as many texts as you want, export to PDF, and use all features at no cost.

Is my data safe when using this diff tool?

Absolutely. Your data never leaves your browser. All text comparison is performed locally using JavaScript, meaning your sensitive documents, code, and personal information are never sent to any server. This makes our tool safe for comparing confidential documents.

What types of files can I compare?

You can compare any plain text content including: source code (JavaScript, Python, HTML, CSS, etc.), configuration files (JSON, XML, YAML), documents (TXT, Markdown), SQL queries, log files, and more. Simply paste the text content into the input boxes. The tool works best with text-based content rather than binary files.

How do I merge changes between two texts?

To merge changes, look for the arrow buttons (→ and ←) in the center gutter between the two panels. Click the right arrow (→) to copy content from the left side to the right, or click the left arrow (←) to copy from right to left. You can undo any merge action using Ctrl+Z or the Undo button.

Can I use this diff tool on mobile devices?

Yes, our text diff tool is fully responsive and works on smartphones and tablets. On mobile devices, the input panels stack vertically for easier viewing. All features including comparison, navigation, merging, and PDF export work on mobile browsers.

What does the "Trim" option do?

The "Trim" option ignores whitespace differences when comparing text. When enabled, extra spaces, tabs, and trailing whitespace are not counted as differences. This is useful when comparing code that may have different formatting but is functionally identical.

How do I save or export the diff results?

You can export your diff results in two ways: 1) Click the "PDF" button to generate a printable PDF document showing all differences with syntax highlighting. 2) Click "Copy" to copy the modified text to your clipboard. The PDF export preserves the color-coded additions and deletions for easy reference.

Does this tool support code formatting?

Yes, click the "Format" button to automatically format your code before comparing. The tool uses Prettier to format JavaScript, HTML, and CSS code. This helps normalize code formatting so you can focus on actual content changes rather than style differences.

# Related Terms & Concepts

text diff file comparison code diff compare text online diff checker text compare tool side by side comparison merge tool document comparison find differences git diff file diff online compare strings line by line comparison spot the difference

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Last updated: December 2025 • Works with all modern browsers