Online Diff Checker

Compare text and code side-by-side with character-level highlighting

Ignore whitespaceIgnore case

Original

Modified

Diff Result

+8-6

AddedRemovedModified

Original

Modified

function calculateTotal(items) {

function calculate(items, tax = 0) {

let total = 0;

for (let i = 0; i < items.length; i++) {

total += items[i].price;

total += items[i].price * items[i].quantity;

}

return total;

return total * (1 + tax);

}

const cart = [

{ name: "Apple", price: 1.50 },

{ name: "Banana", price: 0.75 }

{ name: "Apple", price: 1.50, quantity: 2 },

{ name: "Banana", price: 0.75, quantity: 3 },

{ name: "Orange", price: 2.00, quantity: 1 }

];

console.log("Total:", calculateTotal(cart));

const taxRate = 0.08;

console.log("Total with tax:", calculateTotal(cart, taxRate));

GitHub-Style Visualization

Side-by-side diff view with character-level highlighting, just like GitHub's pull request interface.

Advanced Diff Algorithm

100% Client-Side

All processing happens in your browser. No data is uploaded or stored on any server.

How to use the diff checker

Getting started

Paste or type your original text on the left and modified text on the right
Click "Open" to load files directly from your computer
Toggle "Ignore whitespace" or "Ignore case" to focus on meaningful changes

Understanding results

Green highlights indicate additions, red shows removals
Character-level differences are highlighted within modified lines
Copy or download the diff output for documentation and code reviews

For Developers

Compare source code versions, review Git changes, debug configuration files, and validate API responses.

For Writers

Track document revisions, compare article drafts, review editorial changes, and verify translations.

For Teams

Review policy changes, compare specifications, validate proposals, and audit data between sources.

Frequently asked questions

What file types can I compare?▾

Any text-based content: source code (JS, Python, Java, C++), markup (HTML, XML, Markdown), data formats (JSON, CSV, YAML), config files, and plain text.

Is my data secure?▾

Yes. All comparison happens locally in your browser. No data is sent to any server, uploaded, or stored anywhere.

How accurate is the diff algorithm?▾

We use the industry-standard Myers diff algorithm, the same algorithm used by Git and other professional version control systems.

Is there a file size limit?▾

The tool handles substantial text sizes efficiently. For very large files (>1MB), enable "Ignore whitespace" to improve performance.

Can I export the diff results?▾

Yes. Copy to clipboard or download as a text file. The exported format follows standard diff conventions compatible with most development tools.

Privacy-First Tool

Your data never leaves your browser. Everything happens in your browser. No uploads needed. Ensuring complete privacy and security. No registration, no data collection, no server uploads.

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Online Diff Checker

Compare text and code side-by-side with character-level highlighting

Ignore whitespaceIgnore case

Original

Modified

Diff Result

+8-6

AddedRemovedModified

Original

Modified

function calculateTotal(items) {

function calculate(items, tax = 0) {

let total = 0;

for (let i = 0; i < items.length; i++) {

total += items[i].price;

total += items[i].price * items[i].quantity;

}

return total;

return total * (1 + tax);

}

const cart = [

{ name: "Apple", price: 1.50 },

{ name: "Banana", price: 0.75 }

{ name: "Apple", price: 1.50, quantity: 2 },

{ name: "Banana", price: 0.75, quantity: 3 },

{ name: "Orange", price: 2.00, quantity: 1 }

];

console.log("Total:", calculateTotal(cart));

const taxRate = 0.08;

console.log("Total with tax:", calculateTotal(cart, taxRate));

GitHub-Style Visualization

Side-by-side diff view with character-level highlighting, just like GitHub's pull request interface.

Advanced Diff Algorithm

100% Client-Side

All processing happens in your browser. No data is uploaded or stored on any server.

How to use the diff checker

Getting started

Paste or type your original text on the left and modified text on the right
Click "Open" to load files directly from your computer
Toggle "Ignore whitespace" or "Ignore case" to focus on meaningful changes

Understanding results

Green highlights indicate additions, red shows removals
Character-level differences are highlighted within modified lines
Copy or download the diff output for documentation and code reviews

For Developers

Compare source code versions, review Git changes, debug configuration files, and validate API responses.

For Writers

Track document revisions, compare article drafts, review editorial changes, and verify translations.

For Teams

Review policy changes, compare specifications, validate proposals, and audit data between sources.

Frequently asked questions

What file types can I compare?▾

Any text-based content: source code (JS, Python, Java, C++), markup (HTML, XML, Markdown), data formats (JSON, CSV, YAML), config files, and plain text.

Is my data secure?▾

Yes. All comparison happens locally in your browser. No data is sent to any server, uploaded, or stored anywhere.

How accurate is the diff algorithm?▾

We use the industry-standard Myers diff algorithm, the same algorithm used by Git and other professional version control systems.

Is there a file size limit?▾

The tool handles substantial text sizes efficiently. For very large files (>1MB), enable "Ignore whitespace" to improve performance.

Can I export the diff results?▾

Yes. Copy to clipboard or download as a text file. The exported format follows standard diff conventions compatible with most development tools.

Privacy-First Tool

Your data never leaves your browser. Everything happens in your browser. No uploads needed. Ensuring complete privacy and security. No registration, no data collection, no server uploads.