Text Diff Checker
Compare two text or code files instantly to find differences. Supports side-by-side and inline visual modes.
Paste content into both editors — changed lines will be highlighted inline. Supports JSON, XML, YAML, and plain text.
How to use Text Diff Checker?
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Paste your original content into the left editor.
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Paste your modified content into the right editor.
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The tool will automatically detect the format (JSON, XML, YAML, or Plain Text) and format it properly.
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Changed lines are highlighted inline — red for removed (left), green for added (right).
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No button needed — the diff updates live as you type.
Frequently Asked Questions
What is a text diff?
A text diff (short for difference) compares two pieces of text and identifies exactly which lines were added, removed, or modified. It is a standard technique used by developers, writers, and QA engineers to track changes between file versions.
What formats does this diff tool support?
This tool supports JSON, XML, YAML, and plain text. It analyzes the content structure and selects the appropriate parser automatically. JSON and XML inputs are formatted before comparison for consistent results.
What is the difference between side-by-side and unified diff?
Side-by-side diff shows the original and modified content in two panels next to each other, with differences highlighted inline on each side. Unified diff combines both versions into a single view with + and - prefixes. This tool uses side-by-side for better readability.
Can I diff JSON with different key ordering?
Yes. Both JSON inputs are parsed and re-serialized with consistent formatting before the comparison, so the diff focuses on actual value differences rather than cosmetic formatting or key order.
Is my data secure when using this tool?
Absolutely. All parsing, formatting, and comparison happens entirely client-side in your browser. Your data is never sent to any server. You can verify this by checking the network tab in your browser's developer tools.
Is this tool completely secure?
Yes. All text diffing algorithms run locally in your web browser. We do not store or transmit your source code or sensitive documents.
Can it compare large files?
Yes, our tool is optimized for performance and can compare thousands of lines of text quickly. However, files with tens of thousands of lines might take a moment to render.
Compare Text and Source Code with Precision
Whether you are a software engineer reviewing a pull request, a writer comparing manuscript versions, or a system administrator checking configuration files, identifying exact differences between two pieces of text is a critical task. Doing this manually is not only tedious but highly prone to human error, especially when dealing with thousands of lines of code.
Our Online Text Diff Checker is a powerful, IDE-grade comparison tool that runs directly in your browser. It instantly highlights insertions, deletions, and modifications between your original and modified text. By utilizing advanced diffing algorithms, it identifies changes down to the exact character or word, making it incredibly easy to spot subtle bugs or typos.
Advanced Diffing Features
- Side-by-Side and Inline Views: Toggle between a traditional split-screen view (perfect for wide monitors) or a unified inline view (ideal for mobile devices and smaller screens).
- Syntax Highlighting: Supports rich syntax highlighting for modern programming languages like JavaScript, Python, HTML, and JSON, making code reviews significantly easier.
- Total Privacy: Code comparison requires absolute security. Unlike other online diff tools that send your proprietary source code to a backend server, GoodParse performs all diff calculations 100% locally on your machine.
Stop squinting at your screen to find the missing semicolon. Use our fast and secure Diff Checker to streamline your code reviews and text comparisons today.