Make it local

Choose defaults for supported calculators. You can mix a region, units and currency.

Region preset

Measurement units

Currency label

Changing units converts supported measurements. Changing currency relabels amounts; it does not exchange money. Tax rules, tariffs and broker rates remain your inputs.

Only these preferences are saved in this browser. Calculator inputs are not saved.

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Data tools

Inspect, repair, and organize CSV and JSON files.

Your everyday toolkit · 6 tools

Data tools6

CSV Viewer & Validator

Preview CSV tables and inspect parsing errors.

CSV Encoding Converter

Convert text exports to UTF-8 with an optional Excel BOM.

Merge CSV Files

Combine exports by matching column headers.

Split CSV

Split a table into smaller files by row count.

Remove CSV Duplicates

Remove repeated rows using selected key columns.

CSV ↔ JSON

Convert CSV tables and arrays of JSON records.