Text Diff Checker & Comparison Tool
Compare two text documents or code snippets line-by-line and visually highlight additions, deletions, and modifications.
Our free Text Diff Checker enables developers, editors, and writers to compare two text files line-by-line. Instantly spot additions, deletions, and text modifications with color-coded diff highlights and whitespace controls.
Common Use Cases
- ✓Compare Code Snippets & Configs
Detect modifications between two versions of code, JSON objects, YAML files, or environment configurations.
- ✓Review Document & Essay Revisions
Identify line-by-line additions and deletions in articles, manuscripts, contracts, and legal documents.
- ✓Verify Database & Log Exports
Audit differences between production log files, CSV records, and database exports.
Key Features
Visual Color-Coded Differences
Highlights added lines in green (+), removed lines in red (-), and modified text inline.
Line Number Tracking
Tracks exact line numbers across both documents for easy reference.
Ignore Whitespace Toggle
Optionally filter out trailing spaces and indentation changes to focus on actual content edits.
How to Use This Tool
- Paste Original Text (Text A): Insert the original document or base code snippet into the left box.
- Paste Modified Text (Text B): Insert the updated document or revised text into the right box.
- Review Visual Diff Output: Examine line-by-line additions (+ green) and deletions (- red) in the comparison pane below.
- Swap or Clear: Use the Swap button to reverse original/modified inputs or Clear to start fresh.
Understanding Text Diff Algorithms
A Diff (difference) algorithm compares two sequences of data line-by-line to identify minimal insertion and deletion operations.
Using an online Text Diff Checker eliminates manual scanning when proofreading documents or reviewing uncommitted code changes.
Advanced Features and SEO Benefits
Git-Style Line Diffing
Generates color-coded diff output modeled after Git version control CLI tools.
Zero Server Upload Security
All text comparison logic runs locally in browser memory—confidential code and contracts stay private.
Frequently Asked Questions
How are additions and deletions highlighted?
Added lines are highlighted in green with a + symbol, while removed or changed lines are highlighted in red with a - symbol.
Can I ignore spaces and line indents?
Yes, check the 'Ignore Whitespace' box to disregard space and tab differences when comparing lines.
Is my text uploaded to any server?
No. The diff computation runs completely inside your browser client-side. Your text is never stored or sent anywhere.
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