Diff Checker

Compare text and code differences instantly with Diff checker. Our free online tool highlights changes between two files, ideal for developers, writers, and editors. You can check text, codes, html and others

Text A (Original)

Tip: You can paste logs, paragraphs, or code. We’ll align the best matching lines automatically.

Text B (Changed)

Use ‘Jumbled Sentence’ mode to compare content even when word order has changed.
Removed Added Changed

❓ Frequently Asked Questions

1. What is Diff Checker?

Diff Checker is a free online tool that helps you compare two pieces of text or code side by side. It highlights the differences so you can instantly spot changes, additions, or deletions.

2. Who can use Diff Checker?

  • Developers – to find changes in code.
  • Writers/Editors – to compare document versions.
  • Students/Researchers – to check updates in essays, reports, or papers.
  • Anyone – who needs to quickly compare text differences.
  • Data Analysts – to spot changes in data sets or reports.
  • Web Designers – to compare different versions of HTML, CSS, or JavaScript files.

3. How does Diff Checker work?

You paste your text into two input boxes. The tool automatically analyzes and highlights differences:
Red text = Removed/changed
Green text = Added/updated
Orange text = Changed

4. Does Diff Checker support code comparison?

Yes ✅. It works for plain text, programming code, and markup languages. Differences are always marked clearly.

5. Is Diff Checker free to use?

Yes, the tool is completely free for text and code comparisons.

6. Can I compare large documents or files?

Yes. The tool can handle large text blocks, but performance may vary depending on your device and browser.

7. Do you store or save my data?

No 🚫. Your text stays in your browser session and is not stored on any server. Your content is safe and private.

8. Can I download or export the results?

Currently, you can copy the results directly. (👉 If you want, an Export to PDF/Word/CSV feature can be added.)

9. Does it work on mobile?

Yes. The tool is responsive and works on desktop, tablet, and mobile devices.

10. What are the features available?

Our Diff Checker comes with multiple powerful features to make text and code comparison more accurate and user-friendly:

  • Case Sensitive: Detects differences in uppercase and lowercase letters.
    Example:
    Text A: Hello World
    Text B: hello world
    → Marked as different because of "H" vs "h".
  • Ignore Extra Whitespace: Skips unnecessary spaces or tabs while comparing.
    Example:
    Text A: OpenAI  GPT
    Text B: OpenAI GPT
    → Treated as the same.
  • Mode: Overall Similarity: Shows similarity percentage between two texts.
    Example:
    Text A: The quick brown fox jumps.
    Text B: The quick brown fox leaps.
    → Similarity: 85%
  • Line by Line Comparison: Highlights changes line by line for easier tracking.
    Example:
    Line 1: var a = 10;
    Line 1: var a = 20;
    → Shows the change at line 1.
  • Jumbled Sentence Detection: Identifies when words are rearranged but not deleted.
    Example:
    Text A: AI improves the future.
    Text B: The future improves AI.
    → Highlighted as a rearrangement.
  • Match Threshold (80% default): Lets you define how strict the match should be.
    Example:
    If similarity > 80%, it's considered a match.
  • Swap Inputs: Instantly swap the left and right text boxes for quick re-checks.
  • Clear UI: Reset both text areas with a single click.
  • User-Friendly Design: Simple, responsive layout that works across desktop and mobile devices.