Tipear vs. mecanografiar vs. teclear
As you mentioned, all three Spanish words, tipear, mecanografiar, and teclear, could be translated as to type in English. However, each word has its unique implications and usage in different contexts or regions.
Tipear
B1Tipear is a common term in Latin America that originates from the English word type. It indicates the action of pressing keys on a keyboard to produce text.
Estoy tipeando el informe que me solicitaste.
(I'm typing the report you asked for.)
Tipea más rápido, estamos en un apuro.
(Type faster, we're in a rush.)
Mecanografiar
B2Mecanografiar originally refers to the process of using a typewriter. Nowadays, it generally implies typing with proper technique, such as using all ten fingers and knowing correct keyboard positioning.
He mecanografiado todo el libro.
(I have typed out the entire book.)
Necesito mecanografiar este documento sin errores.
(I need to type this document without mistakes.)
Teclear
A2Teclear simply means to press keys and can be used to refer to typing on any sort of device - computer keyboard, cellphone keypad etc. It’s the most general term for typing.
Estoy tecleando mi contraseña.
(I'm typing my password.)
Por favor, teclee su nombre en el formulario.
(Please type your name into the form.)
Summary
While all three terms mean to type, tipear is commonly used in Latin America and comes from the English word type. Mecanografiar, in contrast, usually refers to typing with proper technique and originates from operating a typewriter. Lastly, the verb teclear can refer to the action of keying into any electronic devices and is the most universal term.