Diff Checker

Compare two texts and highlight differences. Find changes between document versions, code revisions, or any text content.

100% client-side No signup Free forever
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How It Works

  • Compares two texts line by line
  • Highlights additions in green
  • Highlights removals in red
  • Shows unchanged lines in context
  • Supports split and unified views
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How to Use Diff Checker

How to Compare Texts

  1. Enter original text: Paste the first/original version in the left panel.
  2. Enter modified text: Paste the second/modified version in the right panel.
  3. Click Compare: Analyze the two texts for differences.
  4. Review differences: See additions in green, deletions in red.
  5. Switch views: Toggle between side-by-side and inline views.
  6. Navigate changes: Use next/previous buttons to jump between differences.

Reading the Output

  • + Green lines: Text added in the new version
  • - Red lines: Text removed from the original
  • Unchanged lines: Text that appears in both versions
  • Line numbers: Help you locate changes in the original files
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Features

  • Compare two texts instantly
  • Side-by-side comparison view
  • Inline/unified diff view
  • Character-level difference highlighting
  • Word-level difference option
  • Line-level diff for code
  • Syntax highlighting for code
  • Jump to next/previous difference
  • Line numbers display
  • Ignore whitespace option
  • Ignore case option
  • No registration required
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About Diff Checker

Finding differences between two versions of text is tedious and error-prone by eye. Our diff checker highlights exactly what changed: additions, deletions, and modifications. Essential for code reviews, document editing, and version comparison.

Comparison Features

Comprehensive difference detection:

  • Line-by-line comparison: See which lines changed
  • Word-level highlighting: Pinpoint changes within lines
  • Character-level detail: Find single character differences
  • Side-by-side view: Old and new versions aligned

Use Cases

Code review: See exactly what changed between commits. Document editing: Track revisions in contracts or reports. Configuration: Spot differences between config file versions. Content: Compare article drafts or translations.

Reading the Output

Green highlighting shows additions (new in the second text). Red highlighting shows deletions (removed from the first text). Yellow shows modifications. Unchanged lines provide context around changes.

Handling Large Texts

The diff algorithm efficiently handles large documents and code files. For very large comparisons, the tool may focus on changed regions while compressing unchanged sections to keep results readable.

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Frequently Asked Questions

How does the diff checker compare text?
We use advanced diff algorithms (similar to Git) to identify exact changes: additions (green), deletions (red), and unchanged context. Compare character-by-character, word-by-word, or line-by-line depending on your needs.
What comparison modes are available?
Side-by-side view shows both texts with changes highlighted. Inline view shows a merged result with additions and deletions marked. Unified diff format matches standard patch output. Choose based on your preference and the nature of changes.
Can I ignore whitespace or case differences?
Yes! Options include: ignore all whitespace, ignore leading/trailing whitespace, normalize whitespace (treat multiple spaces as one), and case-insensitive comparison. These help focus on meaningful changes rather than formatting differences.
How do I compare code files?
Our code mode provides syntax highlighting in diffs. We recognize many programming languages and can optionally ignore comments or string changes. Perfect for code review, comparing versions, or understanding changes between file versions.
What statistics does the diff provide?
We show: lines added, lines removed, lines changed, total lines, percentage similarity, and change density. These metrics help quantify the extent of modifications and summarize large diffs at a glance.
Can I export or share diff results?
Export as HTML (preserves highlighting), plain text (standard unified diff format), PDF, or shareable URL. The URL contains the diff data so you can share comparisons with colleagues without them re-entering text.