Text Diff / Compare

Comparing two versions of text is a daily task for developers reviewing code, writers revising drafts, editors tracking changes, and legal professionals comparing contract clauses. Our free Text Diff / Compare tool lets you paste any two blocks of text and instantly see exactly what changed — additions highlighted in green, deletions highlighted in red, and unchanged lines shown in neutral gray. Choose between a unified diff view (familiar to developers who use git diff) or a side-by-side split view. All comparison logic runs client-side with zero data leaving your browser.

How to Compare Text

1. Paste your original text — Enter the first version of your text in the left panel labeled "Original Text."
2. Paste your modified text — Enter the updated or changed version in the right panel labeled "Modified Text."
3. View the diff — The output updates in real time. Green lines with a + marker were added, red lines with a - marker were removed, and gray lines are unchanged.
4. Copy or switch views — Use Copy Diff to copy the annotated result, or toggle between Unified and Side by Side views.

Key Features

• Line-by-Line Diffing

  Compares text line by line using an LCS (Longest Common Subsequence) algorithm for accurate diff results.

• Two View Modes

  Unified view mimics git diff output; split view shows original and modified text side by side.

• Color-Coded Output

  Green for additions, red for deletions, and neutral gray for unchanged content.

• Real-Time Results

  Diff updates instantly as you type — no button press needed to see changes.

• Diff Statistics

  See at a glance how many lines were added, removed, and left unchanged.

• 100% Private

  All text stays in your browser — never sent, cached, or logged on any server.

Common Use Cases

• Code Review: Compare two versions of a code snippet, configuration file, or script to see exactly what lines changed between commits.
• Document Editing: Compare an original draft with a revised version to review all edits made by a collaborator or editor.
• Contract & Legal Review: Spot changes between two versions of a contract, terms of service, or policy document instantly.
• Plagiarism Detection: Compare a student's submission against source material to identify matching and modified passages.

Frequently Asked Questions