Free Online Text and Code Diff Tool — Compare Two Files Line by Line

Our free text diff tool compares two blocks of text or code and highlights every addition, deletion and unchanged line — similar to git diff. All comparison runs in your browser — your code never leaves your device. Perfect for reviewing config changes, comparing script versions or checking document edits.

Common Uses

• Comparing configuration files before and after a change
• Reviewing code changes without a full git setup
• Spotting differences between Terraform plan outputs
• Comparing two versions of a Kubernetes manifest
• Verifying a copy matches the original document

How It Works

This tool uses the Longest Common Subsequence (LCS) algorithm — the same algorithm used by git diff and Unix diff — to find the minimal set of changes. Lines in green (+) were added, red (-) were removed, and plain lines are unchanged in both versions.