Free Online Text & Code Diff Checker (Privacy-First)

DiffChecker Pro by ComfyAI is a secure, client-side tool designed for developers and writers. Unlike other tools, we compare your text, JSON, Python, or JavaScript code directly in your browser. No data is ever sent to our servers.

Why use a Local Diff Tool?

Security is paramount when handling sensitive API keys, config files, or proprietary code. Our tool runs 100% locally. You can verify this by inspecting the network tab or even using this tool offline. Perfect for comparing JSON config files, YAML manifests, or AI prompts.

Supported Formats

We support syntax highlighting for over 50 languages including: JavaScript, Python, HTML, CSS, JSON, XML, SQL, and Markdown. Best for checking text differences, finding code changes, and merging documents.

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