Free Online Converters
Convert units, file formats, and data structures.
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Unit Converter
Convert length, weight, volume, and more.
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Length Converter
Meters, feet, inches, miles.
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Weight Converter
Kilograms, pounds, ounces, tons.
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Temperature Converter
Celsius, Fahrenheit, Kelvin.
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Speed Converter
km/h, mph, m/s, knots.
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Area Converter
Square meters, acres, hectares.
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Volume Converter
Liters, gallons, ounces.
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Time Converter
Seconds, minutes, hours, days.
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File Size Converter
KB, MB, GB, TB.
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CSV to JSON
Parse CSV into JSON.
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JSON to CSV
Flatten JSON arrays into CSV.
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Markdown to HTML
Render Markdown as HTML.
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HTML to Markdown
Convert HTML back to Markdown.
About converter tools
A fast set of converters covering the units and formats you need every day — from temperature and currency to CSV, JSON, and Markdown transformations.
Frequently asked questions
Yes. All formulas are based on SI standards and up-to-date reference values.