Diff Checker

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Differences

- Hello World
- This is the original text.
- It has three lines.
+ Hello There
+ This is the new text.
+ It also has three lines.

About this Tool

The Diff Checker helps you compare two pieces of text to find the differences between them. It highlights added and removed lines, making it easy to spot changes in code, documents, or any text-based content. This tool solves the problem of manually scanning for changes, which is error-prone in long texts.

How does it work? It uses a diff algorithm like LCS (Longest Common Subsequence) to identify insertions, deletions, and common parts, then highlights them.

  1. Paste the original text into the left-hand text area.
  2. Paste the changed or new text into the right-hand text area.
  3. The differences will be instantly displayed in the result panel below.
  4. Lines highlighted in red have been removed, and lines in green have been added.
  • Code reviews in pull requests.
  • Tracking edits in document versions.
  • Comparing config files for discrepancies.
  • Side-by-side comparison of two text blocks.
  • Line-by-line difference highlighting.
  • Real-time updates as you edit the text.
  • Useful for code reviews, tracking document changes, and more.

Diff is from Unix utilities, based on edit distance. The concept computes minimal changes to transform one string to another, useful in version control like Git.

Does it handle word-level diffs?

This version is line-based; word diffs could be added.

What about large texts?

Efficient for reasonable sizes.

Can it ignore whitespace?

Not currently, but future options may include.

All calculations and data processing for this tool are performed locally in your browser. We do not send any of your data to our servers, ensuring your information remains private and secure.