How does the online text comparison work?

Our text comparison tool uses a diff algorithm to analyze both texts word-by-word, character-by-character, or line-by-line. It highlights additions in green and deletions in red, giving you an instant visual overview of every change between the two versions.

Is my text sent to your servers when I compare?

No. All text comparison processing happens entirely in your browser using JavaScript. Your text never leaves your device, making it 100% private and secure — ideal for confidential documents, source code, or sensitive content.

Can I compare code files or just plain text?

You can compare any text content including source code, configuration files, HTML, JSON, SQL, prose, legal documents, and more. Use Line mode for code and structured data, and Word mode for natural language text.

What is the maximum text size I can compare?

There is no hard limit on text size. Since processing runs in your browser, very large texts (over 100,000 words) may be slower depending on your device. For most use cases — documents, articles, code files — performance is instant.

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How to Compare Two Texts Online

TextDiffy's text comparison tool is a powerful, free online diff checker that allows you to compare two texts side-by-side and instantly visualize every change. Whether you're a writer tracking revisions, a developer reviewing code changes, a student checking for plagiarism, or a professional editor tracking document versions — this tool gives you a clear, color-coded view of what changed between two versions of a text.

Three Comparison Modes

Word-by-Word: The most common mode. Each word is individually compared, and additions are shown in green while deletions appear in red. Perfect for comparing articles, essays, contracts, and any human-readable text.
Character-by-Character: The most granular mode, ideal for spotting subtle differences like typos, spacing issues, or punctuation changes that are invisible at the word level.
Line-by-Line: Best for code, configuration files, lists, or any structured content where each line is a meaningful unit. Similar to the classic diff command in Unix systems.

Common Use Cases

Document version control: Track what changed between two drafts of a report, proposal, or legal document.
Plagiarism detection: Compare submitted work against an original source to find copied content.
Code review: Quickly identify modified lines of code without a full IDE.
Translation verification: Ensure translated text covers all content from the source.
SEO content audits: Check if updated web content has the right modifications.

Privacy & Security

Your texts are never sent to our servers. All comparison logic runs entirely in your browser using JavaScript. This means your confidential documents, source code, or personal text remain 100% private on your device.

Tips for Better Results

Use Word mode for natural language text and documents.
Use Line mode for structured data, code, or CSV files.
Use Character mode when you suspect small typos or invisible characters.
Remove extra whitespace before comparing to reduce noise in results.

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