Differences
🔒 100% Private: Text comparison happens entirely in your browser. No text is sent to any server.
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Key Features
Everything you need, right at your fingertips. Simple, fast, and built for everyone.
Line-by-Line Diff
Compare two texts and see exactly which lines differ.
Added & Removed
Green for added lines, red for removed, gray for unchanged.
LCS Algorithm
Uses the Longest Common Subsequence algorithm for accurate diffs.
Change Summary
See total additions, deletions, and unchanged lines at a glance.
Private & Secure
All comparison happens locally —your text never leaves your device.
How to Use This Text Diff Checker
Getting started is easy. Just follow these simple steps.
Paste Original Text
Drop your original version in the left panel.
Paste Modified Text
Drop the new version in the right panel.
Click Compare
Instantly see all additions, deletions, and matches.
Review Changes
Scan highlighted lines to understand what changed.
About This Text Diff Checker
A text diff checker compares two pieces of text and highlights the differences between them. It is an essential tool for developers, writers, editors, and anyone who needs to track changes in text or code.
Diff tools typically use the Longest Common Subsequence (LCS) algorithm to find what lines or characters have been added, removed, or changed between two versions of text. Lines present in the original but not the new version are shown as removed, while lines in the new version are shown as added.
Text comparison is used in many contexts: developers use it for code reviews and version control, writers use it to track edits and revisions, students use it to check for plagiarism or changes, and professionals use it to compare documents, contracts, and configuration files.
Using an online text diff checker saves time compared to manually comparing two documents. It instantly highlights every difference, making it easy to see exactly what changed and ensuring no modifications go unnoticed.
Frequently Asked Questions
How does the text diff tool work?
Our diff tool compares two texts line by line using an algorithm based on longest common subsequence (LCS). Lines that are only in the original text are shown in red (removed), lines only in the modified text are shown in green (added), and lines that match are shown normally.
Is my text uploaded anywhere?
No. All comparison happens in your browser using JavaScript. Your text never leaves your device. This makes it safe to use even with sensitive or confidential text.
What can I use a text diff tool for?
Common uses include: comparing versions of code or documents, checking what changed in contract revisions, comparing two articles for plagiarism, reviewing edits to writing, and verifying file changes. Developers use diff tools daily for code review.