How are differences displayed?

Additions are highlighted in green, deletions in red, and unchanged text remains unformatted. You can switch between line-by-line and inline diff views.

Is there a text length limit?

There is no hard limit. The comparison runs in your browser, so it can handle documents of any practical length. Very large documents (100,000+ words) may take a few seconds to process.

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Compare two texts and find differences

Free Text Diff Checker - Compare Two Texts Online

Compare two texts and find differences instantly with our free diff checker. Line-by-line comparison with highlighted additions and deletions.

Text Diff Checker

Compare two texts and see the differences

Original Text

Changed Text

Ignore case Ignore whitespace

Compare by:

Differences

RemovedAdded

Additions

Deletions

Unchanged

100%

Similarity

Enter text in both fields to see differences

What Is a Text Diff Checker?

A text diff checker (also called a text comparison tool) compares two blocks of text and highlights the differences between them. Diff checking is essential in software development for code reviews, in content creation for tracking document changes, and in legal work for contract comparisons. The tool identifies additions, deletions, and modifications line by line, making it easy to spot exactly what changed between two versions of any text.

How to Use This Free Text Diff Checker

1
Paste the original text in the left panel.
2
Paste the modified text in the right panel.
3
Click "Compare" to see differences highlighted.
4
Green highlights show additions, red shows deletions.
5
Review each change to understand what was modified.

Key Features

Side-by-side comparison with color-coded differences
Line-by-line and word-by-word diff modes
Highlights additions (green), deletions (red), and modifications
Handles large documents efficiently
Real-time comparison as you edit
Privacy-first — text is never sent to any server

Why Use FreeDevKit?

Quickly spot differences between document versions
Essential for code reviews and content editing workflows
Free alternative to DiffChecker.com and Beyond Compare
No file upload — paste directly and compare instantly

Frequently Asked Questions

Yes. Our diff checker works with any plain text including source code, configuration files, JSON, XML, and more. It compares character by character for accurate results.