Diff Checker Online Free — Compare Two Texts Instantly
Our free online diff checker compares two texts and highlights every difference — added lines in green, removed lines in red. Works with any text: code, articles, documents, JSON, HTML, or plain text. No signup, completely browser-based.
What is a Diff Checker?
A diff checker finds the differences between two versions of text using the Longest Common Subsequence (LCS) algorithm — the same method used by Git for version control. It shows exactly what was added, removed, or unchanged between the two texts.
Common Uses for Diff Checker
- Compare code versions — see what changed in a file
- Check edited articles — find what was added or removed
- Compare JSON or config files
- Review contract or document changes
- Check plagiarism by comparing texts
- Debug — compare expected vs actual output
Color Legend
- Green: Lines added in modified text
- Red: Lines removed from original
- Normal: Unchanged lines