CompareTool finds every difference in seconds; mismatched values, missing records, duplicate IDs field by field, with the numbers to back it up. Drop in your files. Pick your ID column. Hit compare. That's it. No formulas. No VLOOKUP. Runs in your browser — your data never touches a server. Works offline too. Catches: value changes, missing or new records, duplicate IDs, column mismatches, numeric and date deltas. Doesn't: send your data anywhere, require a login, or cost anything.
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