Data tools
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US Sales Tax Calculator
Estimate purchase tax for all 50 US states and DC, with additional local rates.
US Income Tax Calculator
Estimate federal and state bracket tax from taxable income and filing status.
CSV Encoding Converter
Convert CSV text to UTF-8 and preview the selected source encoding. Check accents before downloading; automatic detection can be wrong.
CSV Duplicate Remover
Remove exact duplicate CSV rows while preserving quoted fields and multiline values. This is not fuzzy matching or a database merge.