Text Difference Checker
Compare two text blocks and instantly highlight what changed — additions, deletions, and moved text. Choose word, line, or character comparison.
What is a Text Difference Checker?
A Text Difference Checker is a powerful online tool that allows you to compare two blocks of text side-by-side and instantly identify all differences. Also called a diff checker or online text comparison tool, it helps you detect what was added, removed, or modified in seconds.
Whether you are a developer reviewing code changes, a writer tracking edits, an editor comparing document versions, or a student checking assignments, a text difference tool saves time and ensures accuracy. It eliminates the need for manual line-by-line comparison.
ToolNexIn's Text Difference Checker compares content word-by-word, line-by-line, or character-by-character for precise results. Changes are color-coded: green for additions and red for deletions, so you can quickly see all modifications.
Best of all, this online tool works entirely in your browser. Your text never leaves your device, ensuring complete privacy. It’s responsive, mobile-friendly, and accessible on any device without registration or installation.
Key Features of Our Text Difference Checker
- Compare texts by words, lines, or individual characters
- Highlight changes with color-coded insertions and deletions
- Swap texts, clear inputs, and copy results easily
- Export results as HTML for sharing or documentation
- Runs entirely in your browser for maximum privacy
- Responsive and mobile-friendly interface for use anywhere
How to Use This Tool
- Paste the original text into the left box (Text A).
- Paste the modified text into the right box (Text B).
- Select the comparison mode: Words, Lines, or Characters.
- Click Compare to instantly highlight differences.
- Optional: Use Export as HTML to save or share results.
Popular Uses
- Code review and source file comparison
- Editing and proofreading written content
- Detecting plagiarism or unauthorized changes
- Tracking revisions in contracts or legal documents
- Spotting changes in configuration or data files
- Comparing emails, reports, or articles quickly
Frequently Asked Questions
Is my text stored on the server?
No. All text comparison is processed locally in your browser. Your content never leaves your device, ensuring complete privacy and security.
Which comparison mode should I choose?
Use Words for natural language text such as articles or emails, Lines for code or structured lists, and Characters for detailed comparisons where every symbol matters.
Can I use this tool for code comparison?
Yes. This tool works perfectly as an online code comparison tool or side-by-side diff viewer for developers, highlighting all changes in code files.
Is the Text Difference Checker free?
Absolutely. This tool is completely free, requires no registration, and has no limits on usage.
Who can benefit from this tool?
Writers, editors, developers, students, teachers, and anyone who needs to compare text, documents, or code can use this tool to save time and reduce errors.
Disclaimer
The Text Difference Checker is designed to highlight differences in text for review purposes only. It is not intended to replace professional editing or legal verification. Always double-check final documents before publishing, submitting, or sharing.