UTL
UTL.toolsThe Digital Toolbox
Updated: August 2026 • Verified v1.2

Text Difference & Inline Character Diff Highlighter

Developer ToolsHigh Usage

Local Browser Execution: Your input is processed locally in your browser and is not sent to UTL servers.
Dynamic Programming: Longest Common Subsequence (LCS) Diff Matrix
Was this calculation helpful?

Understanding Your Results

Calculates Longest Common Subsequence (LCS), highlights added/removed text chunks, and computes overall similarity percentage.

Practical Guidance & Next Steps

Use 'word' granularity for prose and contracts; use 'char' granularity for typo detection and spelling changes.

What is this?

A text comparison utility that highlights precise textual differences between two versions of a document.

How does it work?

1. Paste original text in the left pane and modified text in the right pane. 2. Choose granularity (Word, Character, or Line). 3. View visual color-coded additions (green) and deletions (red).

Why use it?

Reveals subtle contract modifications, copy changes, and text edits instantly.

Technical Scope & Calculation Limitations

Processes text strings up to 50,000 words in browser memory.

Frequently Asked Questions

Yes. All diff computation is executed locally in your web browser with zero server data transfer.
Windows Desktop & Widget Options

Want this capability on your Windows desktop?

All Windows widgets
Desktop App
9.8/10

DevToys — Swiss Army Knife for Developers

Free open-source offline desktop app for Windows featuring 30+ formatters, converters, and hash tools.

FreeEasy InstallLow RAM
By Etienne Baudoux (DevToys Team)View Widget
Complementary Utilities

Related Tools for Your Workflow

All Developer Tools tools
Client-Side Longest Common Subsequence Static Utility
HTML5 / React / TypeScriptStatic Utility
Client-Side Tokenization & Casing State MachineStatic Utility
HTML5 / React / TypeScriptStatic Utility