Free Online Converters

Free online converters that turn one thing into another in seconds — temperatures, encoded text, and more. Each one runs instantly in your browser, with no sign-up and nothing stored. Pick a converter below to get started.

Celsius to Fahrenheit

Convert temperatures between Celsius, Fahrenheit and Kelvin instantly, with the formula shown.

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Base64 Encoder & Decoder

Convert text and files to Base64 and back — encode or decode instantly, with URL-safe mode.

Encode / Decode