⚖️

Free Online Text Compare & Diff Tool

Compare two text blocks and see differences instantly with color-coded highlighting. Green for additions, red for deletions. Perfect for comparing code, documents, and config files. All processing runs locally in your browser.

How to Use Text Diff Checker

Quick Start Guide

1

Paste the original text into the left text area

2

Paste the modified text into the right text area

3

Click Compare to see the differences highlighted

4

Review additions, deletions, and unchanged sections color-coded for clarity

💡Pro Tips

✓Green highlights show added text, red shows removed text
✓Works for code, prose, configuration files, and any plain text
✓All comparison happens locally — your text never leaves your browser
✓Useful for comparing code versions, document revisions, and config changes

Frequently Asked Questions

The text diff tool compares two blocks of text line by line using a diff algorithm. It identifies added lines (green), removed lines (red), and unchanged lines. The comparison runs entirely in your browser.
You can compare any plain text content: code files, config files, Markdown documents, CSV data, log files, emails, and more. Copy and paste directly into the two panels.
Yes — you copy and paste text directly into the input panels. No uploads needed, no data sent to any server. This is especially important for sensitive files.
Make sure both panels contain content and you have clicked Compare. If lines appear unchanged but should differ, check for invisible characters like trailing spaces or different line endings (Windows vs Unix).

Still have questions? Check out our other tools or contact us for support.

Related Tools

🔎

Find & Replace

Find and replace text across pasted documents, code snippets, lists, and drafts with case-sensitive matching, regex support, match counts, and instant preview

🧹

Duplicate Remover

Remove duplicate lines from email lists, CSV columns, keyword lists, logs, and pasted text while preserving the first occurrence, trimming spaces, and ignoring case when needed

📊

Word Counter

Count words, characters, sentences, and paragraphs online for writing, editing, and content checks