Text Diff Checker
Compare two texts and find the differences line by line.
Online Text Diff Checker
Compare two blocks of text and instantly see the differences highlighted line by line. This diff checker uses the Longest Common Subsequence (LCS) algorithm — the same fundamental approach used by Git and other version control systems.
What Can You Compare?
- Source code (JavaScript, Python, Go, Rust, etc.)
- Configuration files (JSON, YAML, TOML, .env)
- SQL queries and database schemas
- API responses and JSON payloads
- Markdown documents and README files
- Plain text, logs, and CSV data
How to Read the Diff
Lines highlighted in green (+) were added in the modified text. Lines highlighted in red (-) were removed from the original text. Unmarked lines are identical in both texts.
Features
- Line-by-line comparison with unified diff view
- Color-coded additions (green) and deletions (red)
- Line numbers for both original and modified text
- Change statistics (added, removed, unchanged lines)
- Swap function to quickly reverse the comparison
- 100% client-side — your data never leaves your browser