Text Diff Checker
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Paste two versions of any text - code, documents, configs - and see exactly what changed. The diff algorithm uses the Longest Common Subsequence (LCS) approach to produce minimal diffs. Added lines are highlighted green with + prefix, removed lines red with − prefix, and unchanged lines are shown with line numbers for context. A summary bar shows the count of added, removed, and unchanged lines. Toggle Ignore whitespace to strip leading/trailing spaces before comparison. Copy the entire diff as plain text with prefixes. 100% browser-based - no data uploaded.
How to Use
- 1Paste the original text in the left panel
- 2Paste the modified text in the right panel
- 3Optionally enable 'Ignore whitespace' to skip indentation differences
- 4Click Compare - added lines appear green (+), removed lines red (−), unchanged lines are dimmed with line numbers
- 5Click Copy Diff to copy the unified diff as plain text
Features
- Line-by-line LCS diff algorithm produces minimal, accurate diffs
- Added lines (green +), removed lines (red −), and unchanged lines with line numbers
- Ignore whitespace toggle strips leading/trailing spaces before comparison
- Summary bar: X added, Y removed, Z unchanged lines
- Copy the full diff as unified text (+ / − / space prefixed)
- Works for any text: code, configs, essays, CSV, logs
- 100% browser-based - no data uploaded
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