Diff Checker

Compare two texts or code snippets side by side and highlight the differences with LCS-based diffing.

📝 Diff Checker

Compare two texts or code snippets and highlight the differences

0 lines, 0 chars
0 lines, 0 chars
⚙️ Options
📝

Paste two texts above and click "Compare" to see the differences

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What is a Diff Checker?

A diff checker is a tool that compares two pieces of text or code and highlights the differences between them. Developers use diff tools daily to review code changes, compare configuration files, and understand what changed between two versions of a document.

CodeHelper's Diff Checker uses an LCS (Longest Common Subsequence) algorithm to produce accurate diffs with line-level granularity, supporting both unified and side-by-side views.

Key Features

  • Unified View: See additions and removals in a single stream with +/- prefixes and color coding.
  • Side-by-Side View: Compare original and modified texts in parallel columns.
  • Ignore Options: Optionally ignore leading/trailing whitespace or case differences.
  • Statistics: See how many lines were added, removed, and unchanged.
  • Swap Inputs: Quickly reverse the comparison direction.

How to use the Diff Checker

  1. Paste the original text in the left panel.
  2. Paste the modified text in the right panel.
  3. Click Compare to see the differences.
  4. Toggle between unified and side-by-side views.
  5. Copy the diff output for documentation or code review.

Whether you are reviewing pull requests, comparing API responses, or tracking configuration changes, this free diff checker makes differences instantly visible.