Image Tools

Text Diff Checker

Compare two text documents side-by-side and highlight additions or deletions. Fully offline and secure inside your browser.

What is Text Diff Checker?

The Text Diff Checker compares two blocks of text side-by-side to highlight additions, deletions, and differences. Ideal for proofreading and code comparison.

How Does Text Diff Checker Work?

It runs standard diff matching algorithms (like Myers diff) to compare strings line-by-line or character-by-character locally in the browser.

How to Use Text Diff Checker — Step by Step

  1. Paste the original text into the 'Text A' panel.
  2. Paste the modified text into the 'Text B' panel.
  3. Click 'Find Differences' to view side-by-side highlights.
  4. Review additions (green highlights) and deletions (red highlights).

Key Benefits

  • Side-by-Side Comparison: Clear, visual side-by-side layout comparing differences.
  • Diff Modes: Compare line-by-line or character-by-character.
  • Complete Privacy: Text comparisons run locally, keeping sensitive copy safe.

Who Uses Text Diff Checker?

  • Proofreading: Compare draft revisions to identify edits.
  • Coding: Compare code snippets to identify bugs or changes.

Tips & Best Practices

  • Use character-by-character mode when looking for minor spelling edits in sentences.
  • Use line-by-line mode when comparing code blocks or structured lists.

Common Mistakes to Avoid

  • Pasting huge files that exceed local memory boundaries.
  • Not aligning paragraph formats, which shows the entire block as different.

Text Diff Checker — Frequently Asked Questions

No. All comparison calculations run entirely in your web browser, keeping your text drafts safe.
Yes, it works with code syntax, text logs, list files, and essays.