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Function Updated 17 Oct 2026

String.toUpperCase()

Returns the string converted to upper case. Letters such as æ, ø and å are converted too. toLocaleUpperCase() gives the same result.

See also String.toLowerCase

Parameters

This function takes no parameters.

Returns

A new string in upper case.

Example

Normal JavaScript, running in the browser or on the Docly™ server.
write("Hello world".toUpperCase());   // HELLO WORLD
write("\n");
write("æøå".toUpperCase());           // ÆØÅ