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Text Diff Checker

Instantly spot the differences between two blocks of text with character-level precision.

Original Text
Modified Text (AI Output)

Why Use an Online Text Diff Checker?

A **Text Diff Checker** is an essential tool for developers, writers, and students who need to **compare two text files** or code snippets side-by-side. It automatically highlights every addition, deletion, and modification, saving you hours of manual proofreading.

How to Read the Diff

When the tool detects a line has been edited, it automatically compares the individual characters within that line:

  • Red highlights show characters or words that were removed from the original text.
  • Green highlights show new characters or words that were added in the modified version.
  • Unchanged text remains with a transparent background for context.

Top Use Cases

For Developers

Debug code by comparing two versions of a file. Spot syntax changes, accidental deletions, or variable renames instantly. Great for quick checks before a git commit.

For Writers

Track changes between drafts. See exactly what an editor changed in your article or essay without needing "Track Changes" enabled in a document processor.

For Data Validation

Compare JSON objects, CSV lists, or configuration files to ensure they match expected outputs.

Frequently Asked Questions

Q: Is this tool free?

A: Yes, this online diff checker is completely free with no usage limits.

Q: Is my data secure?

A: Absolutely. The comparison logic runs entirely in your browser's JavaScript engine. Your text never leaves your device.

Q: What algorithm is used?

A: We use a variation of the **Myers' diff algorithm**, optimized for character-level granularity to give you the most detailed insights.