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How It Works

1

Paste Both Versions

Paste the original code on the left and the modified version on the right.

2

View the Diff

The tool highlights additions, deletions, and unchanged lines with color coding.

3

Switch Views

Toggle between side-by-side and unified views to suit your preference.

Frequently Asked Questions

How does the diff algorithm work?
The tool uses the Longest Common Subsequence (LCS) algorithm to find the optimal diff between two texts. It identifies added, removed, and unchanged lines.
What is the difference between side-by-side and unified view?
Side-by-side view shows the original and modified text in parallel columns. Unified view shows all changes in a single column with + and - prefixes, similar to git diff.
Can I compare any text, not just code?
Yes, the diff checker works with any text content including prose, configuration files, data, and code in any programming language.
What do the colors mean?
Green highlights indicate lines that were added in the modified text. Red highlights indicate lines that were removed from the original text. Uncolored lines are unchanged.
Is my code sent to a server?
No, all diff computation happens in your browser using JavaScript. Your code never leaves your device.
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About Diff Checker

What this tool does

Developer and design tools include CSS generators (gradients, shadows, glassmorphism), code playgrounds, color pickers, responsive previews, and reference charts for HTML tags, HTTP methods, and keyboard shortcuts.

Why use this tool

Front-end development involves constant context switching between code and visual output. Having generators and references in a single browser tab speeds up prototyping and reduces the need to search through documentation sites.

How it works

Each tool provides an interactive UI: you tweak parameters (colors, radii, durations), and the tool generates the corresponding CSS, HTML, or SVG code in real time. Copy the snippet directly into your project.

Pro tip

Use the CSS variable output option when available. It makes your generated code theme-friendly and easier to maintain across a design system.

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