Diff/Patch Tool (Unified Diff Parser + Apply Preview)
Paste original text and unified diff, then validate hunks and preview patched output without modifying files.
About This Tool
This free online Diff/Patch tool parses unified diffs and verifies whether each hunk can be applied to the provided source text. It helps during code review, migration planning, and release troubleshooting when patch output must be inspected quickly.
Use it to validate patch integrity, inspect add/remove counts, and preview resulting content before applying changes in your repository or deployment scripts.