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Free Online Contract Multi-Version Comparison Tool - ATools

Free online contract multi-version comparison: Using baseline text as reference, compare multiple versions line-by-line and highlight additions/deletions, supports copying unified diff.

View source on GitHub
Free online contract multi-version comparison tool that supports pasting or uploading baseline contract text and multiple version texts for line-by-line difference comparison with highlighted additions/deletions, counts changes for each version, and supports copying unified diff results. Pure frontend local operation without data uploads, suitable for contract revision verification, clause change checking, and version management comparison.
Click or drag to replace base text.
Click or drag to upload versions; dragging replaces current version list.
Tip: You can upload PDF contracts directly—we'll extract text locally for diffing (scanned images still require OCR).
Base Contract
Version List
Click version to view diff
Current Version Content:VersionA
Diff Preview (by Line)
+Article 1 Party A...
-Article 1 Party A...
+Article 2 Party B (revised)...
Article 2 Party B...
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.