Free Online Contract Multi-Version Diff Tool tool icon
Contract Diff • Local-only

Free Online Contract Multi-Version Diff Tool

Contract comparison tool that uses a baseline contract as reference and compares multiple versions line by line, highlighting additions and deletions and summarizing changes per version. All processing happens locally in your browser with no contract uploads.

You can upload PDF contracts directly; text will be extracted locally for diffing (scanned images still require OCR).
Base contract (Base)
Version list
Click a version to view differences
Current version content:
Diff preview (line by line)
Tip: This tool is suitable for quick "version comparison/clause change" checks; for complex contracts, it's recommended to first digitize (copy body or OCR) then compare.

How to Use

  • Paste or upload the "Base Contract Text" (original version) on the left.
  • Add or upload the "New Version Contract Text" (revised version) on the right.
  • The system will automatically compare line by line and highlight differences (green for additions, red for deletions) in the bottom right.
  • Supports batch uploading of multiple versions; click different versions in the "Version List" to switch views.

Tips & FAQ

  • Supports uploading .txt, .md, .pdf files (PDF text is automatically extracted).
  • The "Ignore trailing whitespace" option helps avoid false positives due to space or newline differences.
  • All comparison processes are done locally in your browser; contract content is never uploaded to a server.
  • For scanned PDFs (images), please use an OCR tool to convert them to editable text before using this tool.