How does comparison work?

Line-by-line using Longest Common Subsequence algorithm.

Green=added, Red=removed, Yellow=changed, Gray=unchanged.

Yes, any text including code, JSON, config files.

Developer Tools

Diff Checker

Q: What does Ignore Case do?

Case differences are not treated as changes.

Compare two texts side by side. Find additions, deletions & modifications with color-coded highlights.

Original Text

function greet(name) {
  console.log("Hello, " + name);
  return true;
}

var x = 10;
var y = 20;
var result = x + y;

Modified Text

function greet(name, greeting) {
  console.log(greeting + ", " + name);
  return true;
}

const x = 10;
const y = 20;
const sum = x + y;
console.log(sum);

How to Use

Paste the original text in the left panel.
Paste the modified text in the right panel.
Click Compare to see differences highlighted.
Green = added, Red = removed, Yellow = changed.

Features

🔍

Line-by-Line

Compare texts line by line with visual diff.

🎨

Color Coded

Additions, deletions, changes in distinct colors.

⚙

Smart Options

Ignore case, whitespace, empty lines.

📊

Statistics

Count of additions, deletions, and unchanged.

Use Cases

Code Review: Compare code versions to find what changed.
Content Editing: See what edits were made to an article or document.
Config Files: Compare server configs to spot differences.
Contracts: Find changes between document revisions.

Text Comparison in Development

Diff checking is fundamental to version control and code review. Whether comparing two versions of a file, reviewing pull requests, or debugging configuration differences, seeing exactly what changed saves hours of manual review. This tool performs line-by-line comparison with color-coded output for instant visual clarity.

Developer Workflow

Use this alongside the Online Code Editor to test code changes. Validate modified JSON with the JSON Validator. Format code before comparing with the JSON Formatter. Check syntax with the JavaScript Validator.

Frequently Asked Questions

How does the comparison work?

The tool compares texts line by line using the Longest Common Subsequence algorithm to find the minimal set of changes between the two inputs.

What do the colors mean?

Green lines were added in the modified text. Red lines were removed from the original. Yellow indicates lines that were changed. Gray lines are unchanged.

Can I compare code files?

Yes. Paste any type of text including source code, JSON, XML, config files, or plain text.

What does Ignore Case do?

When enabled, uppercase and lowercase differences are not treated as changes.

Is my data secure?

Yes. All comparison runs in your browser. Nothing is sent to any server.

Is it free?

Yes, 100% free with no limits.

Diff Checker | Category: Developer Tools