Text Difference Comparison

Online Text Diff Tool

The Online Text Diff Tool by Toolshu is a free, fast, and easy-to-use text comparison tool. Whether you are reviewing code changes, proofreading documents, or auditing configuration files, simply paste your two text blocks into the left and right editors — the tool instantly highlights all differences with clear color coding, helping you pinpoint every change.

Key Features

• Line-by-line Comparison: Compares text line by line, accurately identifying added, removed, and modified lines.
• Color-coded Highlights: Added lines are shown in green, deleted lines in red, and modified lines display both the original and updated content side by side for instant visual clarity.
• Bidirectional Merge: Merge content from the left or right panel to quickly consolidate two text versions into one.
• Auto Wrap Toggle: Switch auto line wrap on or off to handle long lines without horizontal scrolling.
• Fullscreen Mode: Expand to fullscreen for a larger working area when comparing long documents.
• Quick Copy & Clear: Copy the left or right text independently, or clear all content in one click.

Use Cases

• Code Review: Developers can quickly compare old and new code versions to spot every modification during code review.
• Document Proofreading: Editors can compare drafts before and after revisions to verify all changes are accurate and intended.
• Config File Comparison: DevOps engineers can compare configuration files across environments to detect differences and avoid misconfigurations.
• Contract Auditing: Legal professionals can compare contract versions to track clause changes with precision.
• Academic Writing: Researchers can track edits between manuscript drafts to monitor revisions.

How to Use

1. Paste the original text (old version) into the left editor.
2. Paste the comparison text (new version) into the right editor.
3. The tool automatically highlights all differences in real time using color coding.
4. Click the merge button to combine content from either side if needed.
5. Copy the result or clear both panels and start a new comparison.

Frequently Asked Questions (FAQ)

Q: What types of text does this tool support?

A: The tool works with any plain text content — including Chinese, English, source code (Python, JavaScript, Java, SQL, etc.), and configuration formats (JSON, XML, YAML, INI, etc.).

Q: Is my text uploaded to a server?

A: All text comparison processing happens entirely in your browser. No text is sent to any server, ensuring full privacy and data security.

Q: Is there a text length limit?

A: The tool handles reasonably large texts well. For very large files with tens of thousands of lines, splitting into smaller sections is recommended for the smoothest experience.

Q: How do I locate differences quickly?

A: Differences are highlighted directly in the text using distinct colors for additions, deletions, and modifications — making them immediately visible without any extra search steps.

Q: Can I use this tool on mobile devices?

A: Yes, the tool is responsive and works on smartphones and tablets. However, a larger screen (desktop or tablet) is recommended for the best experience when comparing long texts.