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Celsius and Fahrenheit in either direction. There is a second mode for a difference rather than a reading, because a ten degree rise in Celsius is an eighteen degree rise in Fahrenheit and not fifty — which is the one most converters get wrong.
212.00 °F
100.00 °C converted
0 °C · 32 °F
Water freezes
100 °C · 212 °F
Water boils
−40 in both
They meet
A temperature reading. If you meant "the temperature rose by this much", switch to a difference — the answer is not the same.
Fill in the fields. There is nothing to upload because there is nothing to send — the numbers you enter never leave this tab.
The arithmetic runs in your browser, on your own device, and the answer updates with every keystroke. Nothing is sent anywhere — so there is no record of what you earn, what you owe, or what you are thinking of buying.
One press puts it on your clipboard, ready to paste where you need it. There is no file to download — the result is text, not a document. Nothing is remembered — reload and the fields go back to their defaults, so copy anything you want to keep.