A Text Diff tool compares two pieces of text and identifies the differences between them. It uses the Longest Common Subsequence (LCS) algorithm to find matching lines, then highlights lines that were added, removed, or modified. This tool provides both side-by-side and inline views, with word-level highlighting for detailed comparisons — perfect for code review, document versioning, and content editing.

After comparing your texts, simply click the "Export PNG" button above the diff result. The tool captures the entire comparison view (including line numbers and color highlights) and downloads it as a high-resolution PNG image. This is great for sharing diffs on social media, embedding in presentations, or including in documentation where raw text isn't suitable.

Absolutely. All text comparison happens entirely in your browser using client-side JavaScript. Your text never leaves your device — it is not uploaded to any server, stored, or transmitted over the network. The PNG export is also generated locally using the html2canvas library. You can use this tool with confidence for sensitive documents, proprietary code, or private content.

Red background indicates text that was removed (present in the original but not in the modified version). Green background indicates text that was added (present in the modified version but not in the original). Within matching lines, red strikethrough highlights removed words and green highlight shows added words — giving you precise word-level change tracking.

Yes! This tool works great for comparing code snippets, configuration files, JSON, XML, HTML, CSS, JavaScript, Python, and any other text-based format. The monospace font rendering preserves indentation and alignment, making it ideal for code review workflows. You can quickly spot bugs, track changes between versions, or review pull request diffs visually.

Side-by-Side view displays the original and modified texts in two columns, making it easy to scan horizontally for changes — ideal for wide screens and detailed reviews. Inline view shows all changes in a single column with "+" and "-" prefixes (similar to unified diff format), which is more compact and better for mobile devices or when you prefer a linear reading experience.

The tool is optimized for texts up to approximately 2,000 lines per input. For very large files, the comparison algorithm may take a moment to compute. The LCS (Longest Common Subsequence) algorithm runs with O(n*m) complexity, so extremely large inputs (10,000+ lines) might cause a brief delay. For optimal performance, we recommend comparing sections of very large files incrementally.