What is the difference between Word Diff and Line Diff?

Word Diff compares text on a word-by-word basis, making it ideal for proofreading prose, website copy, and essays. Line Diff compares text line-by-line, which is ideal for programming source code, CSV rows, configuration files, and git commit reviews.

What does 'Ignore Whitespace' do?

When 'Ignore Whitespace' is enabled, the diff engine ignores differences in indentation, trailing spaces, tabs, and line break spacing. This helps you focus strictly on substantive content changes rather than formatting quirks.

Can I compare code snippets and JSON files?

Yes! You can compare JavaScript, Python, HTML, CSS, JSON, Markdown, or SQL. Switch to 'Line Diff' mode for standard developer-friendly code comparison.

Does this tool work offline?

Yes. Once the page is loaded, the diff algorithm executes entirely inside your browser's local JavaScript runtime without needing an active internet connection.

Smart Text Diff Checker

Compare two versions of text, documents, code, or website copy. Highlight additions, deletions, and changed words instantly.

Capabilities

Key Features

Instant in-browser diff calculation using industry-standard diff algorithms
Multi-granularity comparison: Word-by-word, Line-by-line, and Character diffing
Dual visualization: Side-by-Side split view and Unified git-style view
Smart normalization options: Ignore whitespace differences and Ignore letter casing
Visual change analytics counting additions (+), deletions (-), and total modifications
Quick actions to Swap texts, Load copywriting samples, and Copy formatted outputs
100% private and confidential — works completely offline without network uploads

Quick Guide

How to use

Paste your original and modified text

Paste your baseline text in the left 'Original Text' box and your updated copy or code in the right 'Modified Text' box.

Select comparison mode and filters

Choose between Word Diff (recommended for text & copy), Line Diff (for code & lists), or Character Diff. Toggle 'Ignore Whitespace' or 'Ignore Case' as needed.

Analyze highlighted additions and deletions

Inspect the color-coded results panel. Additions appear in highlighted green (+), while deleted text is shown in crossed-out red (-).

Copy or export the comparison result

Click 'Copy Diff' or 'Download .txt' to share or save your formatted comparison report.

Technical Guide

About Smart Text Diff Checker

Smart Text Diff Checker is an instant, privacy-first online utility that compares two blocks of text, documents, website copy, product descriptions, or code snippets. It computes exact differences with word-level, line-level, and character-level granularity. Because all processing executes client-side inside your browser, your sensitive documents, drafts, and confidential contracts are never uploaded or saved to external servers.

FAQ

Frequently Asked Questions

No. Smart Text Diff Checker runs 100% locally in your browser using client-side JavaScript. Your text, drafts, code snippets, and confidential legal documents never leave your computer and are never sent across the internet.

Related Tools

Browse all