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Code Diff Checker

100% Client-Side

Code Diff Checker compares two texts side-by-side to highlight additions, edits, and deletions. Using Google's diff-match-patch algorithm client-side, the engine computes the Levenshtein distance between original and modified strings. It analyzes word sequences, tracks character changes, and renders color-coded inline comparisons (red highlights for removed characters, green for added ones). This tool is essential for developers reviewing code diffs, writers tracking revisions, and editors checking drafts locally in their sandbox.

Open Diff Checker

How It Works

1

Paste Source Text

Paste your primary original text/code snippet into the left textarea.

2

Paste Modified Version

Paste the updated, revised, or modified copy version into the right textarea.

3

Live Diff Rendering

The diff engine maps text layers instantly, highlighting additions in green and removals in red.

Frequently Asked Questions

What algorithm does the diff checker use?

It utilizes Google's optimized Diff Match Patch script to perform line-by-line and character-level comparisons, ensuring highly accurate revision tracking.

Can I compare code snippets as well as plain text?

Yes. You can paste raw code (HTML, CSS, JavaScript, Python) or plain text, and the diff checker will highlight exact syntax changes.

Are my comparisons kept confidential?

Yes. The diffing algorithm runs in local browser sandbox threads, meaning no code or text lines are uploaded to remote databases.