Is the comparison line based or character based?

Lines are matched with an LCS algorithm, so a line is reported as added, removed or unchanged.

Yes. The panes use a monospace font and whitespace is preserved exactly.

Is my content uploaded?

No. The diff is computed locally in your browser.

Text Diff Checker

Compare two texts line by line and highlight the changes.

Original text

function greet(name) {
  return "Hello " + name;
}

Modified text

function greet(name) {
  return `Hello, ${name}!`;
}

+1 · -1 · 3 unchanged

Comparison

 function greet(name) {
-  return "Hello " + name;
+  return `Hello, ${name}!`;
 }

About the Text Diff Checker

Diffing is the quickest way to spot what actually changed between two configuration files, API responses or code snippets when the difference is a single character somewhere in the middle.

The comparison uses a longest-common-subsequence algorithm over lines, the same basic approach as version control tools, and stacks the two panes vertically on small screens.

Frequently asked questions

Related tools

UUID Generator

Developer Utilities

Generate cryptographically random UUID v4 identifiers.

Open Tool

Regex Tester

Developer Utilities

Test regular expressions with live matches and capture groups.

Open Tool

Cron Generator

Developer Utilities

Build cron expressions visually and explain existing ones.

Open Tool

JSON Formatter

Formatters

Format, beautify and validate JSON with clear error messages.

Open Tool

About the Text Diff Checker

Frequently asked questions

Is the comparison line based or character based?

Can I compare code?

Is my content uploaded?

Related tools

UUID Generator

Regex Tester

Cron Generator

JSON Formatter