innen
inside
Refers to the inner area or interior of a room, building, or object. The opposite of 'außen' (outside).
Das Haus ist von innen viel schöner als von außen.
The house is much more beautiful on the inside than on the outside.

inside
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inside
Refers to the inner area or interior of a room, building, or object. The opposite of 'außen' (outside).
Das Haus ist von innen viel schöner als von außen.
The house is much more beautiful on the inside than on the outside.

This adverb is used differently depending on the question. 'Innen' (inside) describes a place (question: Wo? — where?), while 'nach innen' (inward/to the inside) indicates a direction (question: Wohin? — where to?) and 'von innen' (from the inside) indicates an origin (question: Woher? — where from?).
Bitte warten Sie, es ist jemand innen.
Please wait, there is someone inside.
'Innen' (inside/interior) serves as the first part of many compound nouns. These then describe something related to the inner area, for example 'die Innenstadt' (city center), 'die Innenpolitik' (domestic policy), or 'der Innenraum' (interior).
Die neue Wohnung hat einen sehr großen Innenhof.
The new apartment has a very large inner courtyard.
As an adverb of location, 'innen' (inside) often appears at the end of the sentence or clause. It can also stand directly after the verb to emphasize the interior.
Das Zelt war innen überraschend geräumig.
The tent was surprisingly spacious inside.
within / inside
'innerhalb' and 'innen' can both say that something is in an inner area. The most important difference is the form: 'innerhalb' is normally used with a noun and a boundary, for example 'innerhalb des Gebäudes' (inside/within the building). It sounds more precise and often somewhat more formal. 'innen' is an adverb and simply describes the inside or inner area, often in contrast to 'außen' (outside). Learners may confuse the words because both mean 'not outside'. A practical tip: with a specific area and the genitive, 'innerhalb' often fits; without a noun, 'innen' often fits.

Die Tür ist innen frisch gestrichen.
The door has been freshly painted on the inside.
Innerhalb des Hauses dürfen die Kinder nicht mit dem Ball spielen.
Inside the house, the children are not allowed to play with the ball.