What is the difference between Line Diff and Word Diff?

Line Diff compares documents line by line, which is ideal for source code and configuration files. Word Diff isolates modified words and phrases within sentences, which is ideal for reviewing prose, documentation, and copy edits.

Is my text or code sent to any server?

No. The entire comparison algorithm runs locally in your browser memory using the standard diff engine. Your code, proprietary algorithms, and private notes never leave your device.

Can I export or copy the diff output?

Yes, you can click 'Copy Patch' to copy a standard unified diff patch to your clipboard, or use the download action to save a .patch file.

Text & Code Diff Checker

Compare two text documents or code snippets with side-by-side split and unified views, line and word granularity, and instant change counts.

Zero Server Uploads

+5 lines-6 lines

Original (Old)7 lines

Modified (New)6 lines

1-function calculateTotal(items, taxRate) {

1+function calculateTotal(items: CartItem[], taxRate: number): number {

2- var total = 0;

2+ // Use modern reduce with initial value

3- for (var i = 0; i < items.length; i++) {

3+ const subtotal = items.reduce((sum, item) => sum + item.price, 0);

4- total += items[i].price;

4+ const tax = subtotal * taxRate;

5- }

5+ return Math.round((subtotal + tax) * 100) / 100;

6- return total * (1 + taxRate);

Client Memory Engine168 chars

100% Client-Side. No data ever leaves your browser.

Visual Text and Code Comparison in Your Browser

Compare two versions of code, configuration files, or prose without sending data to remote servers. Inspect differences with side-by-side split columns or unified inline patches, toggle between line and word granularity, and view exact counts of added and removed elements.

Key Highlights & Capabilities

Side-by-side split view with aligned row numbering
Unified inline patch view with dual old/new line numbers
Line-level and word-level diff granularity options
Real-time counts for added and removed lines or words with clear context labels
One-click Swap button to reverse original and modified texts
Whitespace and indentation preservation with support for empty documents
One-click diff patch copying (.patch) and local browser execution

Technical Specifications & In-Browser Limits

Execution & Privacy Model

100% in-browser client execution. No server logs, no database storage, and no network transmission of editor content.

Performance & Payload Capacity

Equipped with virtualized gutter windowing. Handles files up to ~25 MB or 400,000 lines smoothly without freezing browser UI.

Frequently Asked Questions

Side-by-side mode aligns the original text on the left with the modified text on the right. Deleted content is highlighted in red, inserted content is highlighted in green, and unchanged lines remain aligned.

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Visual Text and Code Comparison in Your Browser

Key Highlights & Capabilities

Side-by-side split view with aligned row numbering

Unified inline patch view with dual old/new line numbers

Line-level and word-level diff granularity options

Real-time counts for added and removed lines or words with clear context labels

One-click Swap button to reverse original and modified texts

Whitespace and indentation preservation with support for empty documents

One-click diff patch copying (.patch) and local browser execution

Technical Specifications & In-Browser Limits

Execution & Privacy Model

100% in-browser client execution. No server logs, no database storage, and no network transmission of editor content.

Performance & Payload Capacity

Equipped with virtualized gutter windowing. Handles files up to ~25 MB or 400,000 lines smoothly without freezing browser UI.