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Overview

Diff Checker

Compare two text documents to find differences instantly. Features precise line, word, and character-level diffing with a GitHub-style unified view.

Category hub

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Problems

5

FAQ

3

Local Diff Engine

What you can solve

How to compare two text files online?

Line mode compares text block-by-block (best for code). Word mode isolates changes down to specific words in a sentence (best for prose). Char mode highlights exact character swaps (best for finding subtle typos).

Find differences between two strings?

Line mode compares text block-by-block (best for code). Word mode isolates changes down to specific words in a sentence (best for prose). Char mode highlights exact character swaps (best for finding subtle typos). Comparing two versions of a source code file to track undocumented changes. What is the difference.

Online git diff viewer?

Using an advanced difference algorithm, it highlights insertions in green and deletions in red, generating a unified diff view identical to what you see in GitHub or VS Code.

Tool to see what changed in code?

Choose your preferred comparison granularity (Lines, Words, or Chars), toggle options like 'Ignore Whitespace', and click 'Compare Texts' to see the exact changes.

Compare json text online?

The Diff Checker is a robust utility that compares the 'Original Text' and 'Modified Text' to detect modifications.

Typical workflow

Guides for this workflow

Supporting guides that connect this tool to the broader category workflow.

Open category hub

What is

What is Diff Checker?

The Diff Checker is a robust utility that compares the 'Original Text' and 'Modified Text' to detect modifications. Using an advanced difference algorithm, it highlights insertions in green and deletions in red, generating a unified diff view identical to what you see in GitHub or VS Code.

How to use

How to use Diff Checker

Paste your original text into the left panel and the modified text into the right panel. Choose your preferred comparison granularity (Lines, Words, or Chars), toggle options like 'Ignore Whitespace', and click 'Compare Texts' to see the exact changes.

Example

Example

Original: 'The quick brown fox jumps over the lazy dog.'
Modified: 'The fast brown fox jumps over the lazy cat.'
Result: The tool will highlight 'quick' and 'dog' as deletions, and 'fast' and 'cat' as additions.

Common use cases

Common use cases

1. Comparing two versions of a source code file to track undocumented changes.

2. Reviewing edits made to an essay, article, or legal document.

3. Checking JSON files to spot missing keys or altered values.

4. Verifying configuration file changes before server deployment.

Frequently asked questions

Frequently asked questions

Are my files uploaded to your servers?v
No. The entire comparison process is executed locally in your browser via JavaScript. Your sensitive text or code never leaves your device.
What is the difference between Line, Word, and Char modes?v
Line mode compares text block-by-block (best for code). Word mode isolates changes down to specific words in a sentence (best for prose). Char mode highlights exact character swaps (best for finding subtle typos).
Can it handle large files?v
Yes, the JsDiff engine is highly optimized. However, comparing files with tens of thousands of lines in the browser may cause temporary UI freezing.