The Diff Checker Tool is a lightweight, web-based utility designed to compare two blocks of text and highlight their differences. It provides an intuitive interface for users to paste texts, compare them, and view the changes in a clear, colour-coded format. The tool compares multiline texts, programming code, HTML, or other textual content. It uses the Myers difference algorithm for change detection.
Differences
Diff Checker Tool Features:
- Both Plain Text and Programming Code Difference Detection
- Automatically detects if a code snippet is provided and shows the code comparison result syntax highlighted
- Multiline Support
- Handles multi-line inputs seamlessly, which makes it suitable for code, HTML, or large documents.
- Color-Coded Differences
- Result section will highlight added lines in green.
- Result section will highlight removed lines in red.
- Unchanged lines are displayed as-is.
- Cross-Browser Compatibility
- Works in all modern browsers without requiring additional plugins or configurations.
Usage Example
Step-by-Step Guide
- Input Texts
- Paste the first text block into the left text-area labelled “Paste your first text here…”
- Paste the second text block into the correct text-area labelled “Paste your second text here…”
- Compare Texts
- Click the “Compare” button to analyze the differences between the two texts.
- View Results
- The differences will be displayed below the button in a styled output area.
- Added lines will appear in green, removed in red, and unchanged lines will remain unstyled.
Example:
Text1:

Text 2:

Example output:

Limitations:
- Line-by-Line Comparison
- The current implementation compares texts line by line. It does not support intra-line character-level diffs (e.g., highlighting specific words or characters within a line).
- Whitespace Sensitivity
- Differences in whitespace (e.g., tabs vs. spaces) may be flagged as changes.
- Performance with Large Inputs
- While the tool handles moderate-sized texts efficiently, extremely large inputs may impact performance due to the lack of optimization for large datasets.