Text Diff & Code Compare

100% private. All differential analysis happens securely in your browser.

Original Text (Left)

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Modified Text (Right)

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Diff Precision

Comparison Resultslines level diff

1-// Sample original code

1+// Sample modified code

2-function calculateTotal(price, tax, discount) {

2+function calculateTotal(price, tax, discount = 0) {

3- const subtotal = price + tax;

3+ const subtotal = price * (1 + tax / 100);

4 const total = subtotal - discount;

6+ if (total < 0) return 0;

5 return total;

7 return total;

8console.log(calculateTotal(100, 10, 5));

10console.log(calculateTotal(100, 10, 5));

Added: +5 linesRemoved: -3 linesUnchanged: 5 lines

How does Client-Side Diff work?

This tool computes the differences between two strings using the Myer's Diff algorithm. By comparing the text directly inside your browser window, your source code, configuration files, and sensitive credentials never touch any external API, ensuring absolute privacy.

Diff Modes Explained

Line Diff: Compares files line-by-line. Perfect for source code file revisions and system configuration updates.
Word Diff: Compares files word-by-word. Ideal for prose, copy edits, document proofreading, or markdown content.
Character Diff: Highlights changes down to individual character letters, showing the most granular shifts, typos, or white-spaces.

Frequently Asked Questions

What does a diff tool do?

A diff compares two blocks of text line by line and highlights what changed — added lines in green, removed lines in red. It uses the same comparison format as git diff.

Does my text get sent to a server?

No. Both inputs and the diff computation run entirely in your browser. Your text never leaves your device — safe for comparing confidential documents or private source code.

What's the difference between word diff and line diff?

Line diff marks entire lines as added or removed. Word diff highlights the specific words within a changed line, making it easier to spot small edits in long paragraphs.

Why do some lines appear changed when the content looks identical?

Trailing whitespace or different line endings (Windows CRLF vs Unix LF) look the same visually but differ byte-by-byte. Toggle 'Ignore whitespace' to strip these differences.

Can I compare source code files?

Yes. Paste any plain text: source code, JSON, config files, SQL, or prose. The output is a standard unified diff you can copy and share.

Private & free — this tool runs entirely in your browser.