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01Unit converterFour families, with decimal and binary data units named separately↗02Percentage calculatorThree common percentage questions and their formulas↗03Date calculatorCalendar-day difference or an integer-day shift↗04Base converterWhole-number conversion without floating-point rounding↗05Timestamp converterSeconds or milliseconds, shown in UTC and local browser time↗06CSV ↔ JSONQuoted fields and object arrays, processed in this browser↗

Inputs are handled by local page code. No account or uploaded file is needed. Read each tool’s limits before using its output in a consequential workflow.