Diff Checker
Compare two texts or code snippets. Highlights added, removed, and changed lines.
▪ Original
0 lines
▪ Modified
0 lines
No comparison yet
Paste text into both panels and click Compare
About Diff Checker
This tool computes a line-by-line diff using the LCS (Longest Common Subsequence) algorithm — the same approach used by Git. It highlights added lines in green, removed lines in red, and uses inline character-level highlighting to show exactly which characters changed within a modified line. Everything runs in your browser; no text is ever sent to a server.
What is a Online Diff Checker?
A Diff Checker compares two pieces of text or code and highlights exactly what changed. Uses LCS algorithm — same as Git.
Common Use Cases
Comparing two versions of source code
Spotting changes in config files
Reviewing document edits
Comparing API responses
Tips & Best Practices
Use Split view for large files
Enable Ignore Whitespace to focus on real changes
Ctrl+Enter to run comparison instantly
Frequently Asked Questions
What is a diff checker?▼
A diff checker compares two text inputs and highlights additions in green and deletions in red — like Git shows file changes.
What algorithm is used?▼
LCS (Longest Common Subsequence) with character-level inline highlighting — the same approach used by Git and GitHub.
Can I compare code files?▼
Yes — switch to Code mode and select your programming language from the dropdown.