Spotting the difference between two similar images is a fun game for kids. Spotting the difference between two 10,000-line code files is a torture method for developers.

The Text Diff Checker automates this process. It compares "Original Text" vs "Modified Text" and highlights every single insertion, deletion, and modification using color-coded visual cues.

How It Works

We use a standard "diff" algorithm (typically based on the Myers algorithm). It calculates the minimum number of edits required to transform Text A into Text B.

  • Red Background: Text that was removed from Original.
  • Green Background: Text that was added to Modified.
  • White/Grey: Text that remained unchanged (context).

Use Cases

1. Code Review

"It works on my machine." "Well, what did you change?"
Paste your local config and the server config into the tool. You'll instantly see that you changed DEBUG=True to False, or missed a comma.

2. Plagiarism Clean-up

If you rewrote an article, you can compare the draft vs the final version to see exactly how much changed.

3. Contract Revision

Lawyers live by diffs. If someone sends back a revised contract, you need to know exactly which words they changed. Did they change "Shall pay within 30 days" to "90 days"? A diff checker ensures no sneaky edits slip through.

4. List Comparison

Compare two lists of emails (Old List vs New List) to see who unsubscribed (Red) and who signed up (Green).

Line-by-Line vs Character-by-Character

Our tool supports both modes.

  • Line Mode: Best for code. Shows whole lines that changed.
  • Character Mode: Best for prose. Shows exactly which letters were fixed (e.g., correcting a typo "recieve" -> "receive").