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Developer Tools
Compare two blocks of code side-by-side or in unified view. Highlights additions, deletions, and unchanged lines with colored indicators. Uses a custom LCS diff algorithm — no server needed.
Follow these simple steps to get instant, accurate results directly in your browser:
Paste your baseline source code snippet into the left code editor.
Paste your new or refactored code snippet into the right code editor.
Review red deletions and green additions with inline word highlights.
The Code Diff Viewer is an advanced syntax-aware code comparison tool that visualizes line additions, deletions, and inline character modifications between two code revisions.
Powered by the Myers diff algorithm, the viewer displays side-by-side split view or unified inline view with syntax highlighting for JavaScript, TypeScript, Python, HTML, CSS, JSON, and SQL. It highlights exact word-level and character-level edits within modified lines, making subtle logic changes immediately apparent.
The tool operates 100% in your local browser sandbox. Proprietary source code, algorithmic logic, and private git commits never touch an external server.
Highlights the exact characters modified within changed lines.
Switch easily between side-by-side dual columns and unified git-style views.
Clean syntax coloring for JS, TS, Python, JSON, CSS, and HTML.
No code is transmitted or stored on external servers.
Inspect proposed code changes and refactored logic before approving git pull requests.
Compare broken production code against a working historical snapshot to isolate regressions.
Compare server environment files (.env), Dockerfiles, and CI workflow configurations.
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