
das Kästchen
small box
A small, often lockable container or small box used for storing objects.
Sie bewahrt ihren alten Schmuck in einem hölzernen Kästchen auf.
She keeps her old jewelry in a small wooden box.
small box / checkbox / square
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small box
A small, often lockable container or small box used for storing objects.
Sie bewahrt ihren alten Schmuck in einem hölzernen Kästchen auf.
She keeps her old jewelry in a small wooden box.

checkbox
A small, usually square field on a form or screen that you can check or fill in (checkbox).
Wenn Sie den Newsletter abonnieren möchten, setzen Sie bitte ein Häkchen in das entsprechende Kästchen.
If you would like to subscribe to the newsletter, please put a check mark in the corresponding checkbox.

square
One of the fields in a grid pattern, for example on graph paper or a game board.
Beim Schach darf pro Kästchen nur eine Figur stehen.
In chess, only one piece may stand on each square.
'Kästchen' (small box / checkbox / square) is the diminutive form of 'der Kasten' (box/crate/container). The ending '-chen' makes the word neuter ('das') and means 'small box'.
Er hat einen großen Kasten für Werkzeug und ein kleines Kästchen für Schrauben.
He has a large box for tools and a small box for screws.
In the meaning 'checkbox', 'Kästchen' (checkbox) is very often used with the verbs 'ankreuzen' (to check/tick) or 'auswählen' (to select). A common phrase is also 'ein Häkchen in das Kästchen setzen' (to put a check mark in the checkbox).
Bitte kreuzen Sie alle zutreffenden Kästchen an.
Please check all applicable boxes.
When referring to a small container, 'Kästchen' (small box) is often combined with verbs such as 'aufbewahren' (to keep/store), 'verstauen' (to stow away), or 'öffnen' (to open). Adjectives such as 'hölzern' (wooden), 'alt' (old), or 'geheimnisvoll' (mysterious) are also typical.
In dem alten Kästchen auf dem Dachboden fanden wir Liebesbriefe von unserem Großvater.
In the old small box in the attic, we found love letters from our grandfather.
The meaning 'field in a grid' can be recognized from the context of games, patterns, or paper. Typical formulations are 'ein Kästchen ausmalen' (to color in a square) or 'etwas in ein Kästchen schreiben' (to write something in a square/box).
Die Kinder malten die Kästchen auf dem karierten Papier in verschiedenen Farben aus.
The children colored the squares on the graph paper in different colors.