Compare Code Online — Drag & Drop · URL Import · AI Summary · 10+ Languages
Real-time diff · Character-level · AI summary · Merge mode · Timeline · Git export · 100% browser
Compare any code online. Drag and drop files directly into the panels, paste raw GitHub URLs to fetch content, or type directly. Language is auto-detected from content. Get an AI-powered plain English summary of what changed.
What is a Code Diff Checker?
A diff checker compares two versions of text or code and highlights what changed. It shows added lines in green, removed lines in red, and changed lines in amber — exactly like git diff or a pull request review on GitHub.
Key Features
This tool includes side-by-side and inline views, character-level diff highlighting (exact words that changed), three diff algorithms (Myers, Patience, Histogram), AI-powered plain English summaries, 3-way merge mode, change timeline, and multiple export formats including .diff (git patch) and HTML reports.
Frequently Asked Questions
Which file types are supported?
Any text file up to 5MB. Auto-detects: JavaScript, TypeScript, Python, HTML, CSS, SQL, JSON, Java, Rust, C++, PHP, YAML, Markdown, and plain text.
How does language auto-detection work?
The tool analyzes patterns in the code to identify the language — keywords like SELECT/FROM for SQL, def/import for Python, function/const for JavaScript. The detected language is shown as a badge in the header.