Can I ignore whitespace differences?

Yes. Toggle "Ignore whitespace" to skip spacing differences, "Ignore case" for case-insensitive comparison, and "Ignore blank lines" to skip empty lines.

Can I download the diff output?

Yes. Click the ".diff" button to download the unified diff in standard patch format, compatible with Git and other tools.

Is my text uploaded to a server?

No. All comparison happens 100% in your browser. Your text never leaves your device.

Diff Checker

Compare two texts and spot every difference instantly

DeveloperFREEYour data never leaves your browser

Ignore whitespaceIgnore caseIgnore blank lines

Original

Modified

5 added4 removed3 unchanged

1-function greet(name) {

2- console.log("Hello, " + name);

1+function greet(name, greeting) {

2+ console.log(greeting + ", " + name);

33 return true;

44 }

55

6-const x = 42;

7-const arr = [1, 2, 3];

6+const x = 100;

7+const arr = [1, 2, 3, 4];

8+const obj = { key: "value" };

How to Use

1

Paste your original text in the left panel

2

Paste the modified text in the right panel

3

View the diff below — green for added, red for removed lines

4

Switch between side-by-side, unified, or inline views. Download as .diff file.

Frequently Asked Questions

The tool uses a Longest Common Subsequence (LCS) algorithm for accurate line-by-line matching. This is the same approach used by Git and other version control systems.

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