Free Text Compare Tool — Find Differences Between Two Texts Instantly
Quickly compare two texts and identify every difference with our free online diff checker. Whether you're proofreading documents, reviewing code changes, checking plagiarism edits, or tracking version revisions, this tool highlights additions, deletions, and modifications in an easy-to-read visual format.
Paste your original and modified texts, click compare, and instantly see what changed. Color-coded highlighting makes differences immediately obvious—green for additions, red for deletions. Perfect for writers, developers, editors, students, and anyone who needs to track text changes.
How the Text Diff Checker Works
1. Paste Both Texts
Enter your original text on the left and the modified version on the right.
2. Choose Options
Optionally ignore case, whitespace, or switch between word and character-level comparison.
3. View Differences
See a merged view with all changes highlighted in green (added) and red (removed).
Understanding the Diff Output
Added Text
Green highlighting shows text that was added in the modified version but doesn't exist in the original.
Removed Text
Red highlighting with strikethrough shows text that was deleted from the original and doesn't appear in the modified version.
Unchanged
Plain text without highlighting is identical in both versions—no changes were made to these parts.
Comparison Options Explained
Ignore Case
Treats uppercase and lowercase letters as identical. "Hello" and "hello" will match. Useful for comparing content where capitalization may have changed but meaning is the same.
Ignore Whitespace
Normalizes spacing differences. Multiple spaces become one, and trailing spaces are ignored. Helpful when formatting has changed but content is the same.
Word-Level vs Character-Level
Word-level (default) compares whole words—cleaner output for prose and documents. Character-level shows exact character differences—better for code, passwords, or finding typos within words.
Who Uses Text Comparison Tools?
Writers & Editors
Compare drafts to see what your editor changed. Track revisions between versions of articles, books, and manuscripts.
Developers
Quick code comparison without a full IDE. Compare configuration files, API responses, or debug output differences.
Students & Teachers
Check assignments for unauthorized copying. Compare essay drafts to ensure proper citation and originality.
Legal Professionals
Compare contract versions to identify changed clauses. Track modifications in legal documents and agreements.
Translators
Compare translation versions to track changes. Identify what was modified by reviewers or clients.
Data Analysts
Compare CSV exports, SQL queries, or data outputs to identify discrepancies between datasets.
Text Diff for Developers
This tool uses a LCS-based diff algorithm similar to what powers git diff. It's useful for:
- Comparing JSON or XML configuration files
- Debugging API response differences
- Reviewing code snippets without full IDE setup
- Comparing environment variable files (
.env) - Checking database query outputs
For production code review, consider using git diff, GitHub's compare view, or dedicated tools like Beyond Compare.
Your Texts Remain Private
The comparison algorithm runs entirely in your browser using JavaScript. Your texts are never uploaded to any server.
- No server-side processing
- No data storage or logging
- Works offline after page load
- Safe for confidential documents