Text Diff Tool - Compare Two Texts

A text diff tool compares two blocks of text and highlights the differences line by line or character by character. It shows what was added, removed, or changed. Use it to review document edits, compare code versions, or verify config changes.

1. Paste original text: Add the first version in the left panel.
2. Paste modified text: Add the updated version in the right panel.
3. Compare: Click Compare to see additions (green) and removals (red) highlighted.

• Spot changes fast: Find edits in long documents without reading every line.
• Code review: Compare code snippets without a full Git setup.
• Config auditing: Verify changes between environment files before deployment.

Use case 1: Document editing

Compare draft versions to see what an editor changed before approving.

Use case 2: Code comparison

Diff two function versions to understand a refactor or bug fix.

Use case 3: Configuration checks

Compare staging and production config files to catch unintended differences.

Basic example

Original: The quick brown fox
Modified: The quick red fox
Output: brown highlighted as removed, red as added.

Advanced example

Original: 50-line config file
Modified: Same file with 3 lines changed
Output: Unchanged lines shown normally; changed lines highlighted with before/after.

Whitespace differences

Trailing spaces or tab vs. space mismatches can show as changes. Normalize whitespace first with the whitespace remover.

Encoding issues

If text appears garbled, ensure both inputs use the same character encoding (UTF-8 recommended).

• Collapse unchanged sections to focus on differences in long files.
• Use the remove line breaks tool to flatten text before comparing if line breaks differ.
• For side-by-side code comparison, copy the diff output into your editor.

• Remove duplicate lines with the duplicate line remover.
• Clean whitespace using the whitespace remover.
• Format JSON before comparing with the JSON formatter.

Comparison runs locally in your browser. No text is uploaded, so sensitive documents and code stay private.