Free online tools to generate, calculate, convert, format, transform, and de/en-code.
 

Diff Checker

Compare two texts or files and view differences. Side-by-side and unified diff views available with line-by-line and character-level comparison.


Input Texts

Drop file here or
Drop file here or

Features

  • Side-by-Side View: Compare texts in split view with synchronized scrolling
  • Unified View: Traditional unified diff format with +/- indicators
  • Character-Level Diff: Highlight individual character differences within modified lines
  • Context Control: Adjust number of unchanged lines shown around changes
  • File Upload: Drag and drop or browse files for comparison
  • Statistics: View added, removed, modified, and unchanged line counts
  • Line Numbers: Easy navigation with line numbering for both texts
  • Syntax-Aware: Preserves formatting and whitespace differences

About Diff Checking

A diff checker compares two versions of text or code to identify what has changed between them. This is essential for code review, document comparison, and tracking changes over time.

Common Uses:
  • Code Review: Compare different versions of source code files
  • Document Comparison: Track changes in text documents, contracts, or articles
  • Configuration Files: Identify differences in config files across environments
  • Debugging: Compare expected vs actual output to find issues
  • Merge Conflicts: Understand differences before merging changes

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