offenbaren
to reveal
To deliberately make known or reveal something that was secret, unknown, or hidden.
In dem Brief offenbarte er ihr seine wahren Gefühle.
In the letter, he revealed his true feelings to her.

to reveal
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to reveal
To deliberately make known or reveal something that was secret, unknown, or hidden.
In dem Brief offenbarte er ihr seine wahren Gefühle.
In the letter, he revealed his true feelings to her.

The verb 'offenbaren' (to reveal) is closely related to the adjective 'offen' (open). It literally means to 'make something open,' that is, to make it visible or known.
Er wollte seine Pläne noch nicht offenbaren.
He did not want to reveal his plans yet.
'Offenbaren' (to reveal) is a word used in elevated language. It sounds more formal and poetic than everyday verbs like 'zeigen' (to show) or 'verraten' (to betray/reveal).
Die Untersuchung offenbarte schwere Mängel in der Konstruktion.
The investigation revealed serious defects in the construction.
The verb can be used transitively or reflexively. 'Etwas offenbaren' (to reveal something) means to disclose a secret. 'Sich offenbaren' (to reveal itself/oneself) means that something becomes visible on its own or shows itself.
Der Zeuge offenbarte dem Gericht wichtige Details.
The witness revealed important details to the court.
When saying to whom something is revealed, that person or group is in the dative. The thing revealed is in the accusative.
Sie offenbarte nur ihren engsten Freunden ihr Geheimnis.
She revealed her secret only to her closest friends.
The reflexive form 'sich offenbaren' (to reveal itself/oneself) is often used in a religious or spiritual context. Words like 'Gott' (God), 'Geist' (spirit), or 'Vision' (vision) are typical companions then.
In der Stille der Natur offenbarte sich ihm eine tiefe Wahrheit.
In the silence of nature, a deep truth revealed itself to him.
to show
'zeigen' and 'offenbaren' can both mean that something becomes visible or recognizable. However, 'zeigen' is much more general and fits very many everyday situations: you can show a photo, show feelings, or show something with numbers. 'offenbaren' sounds stronger and often more formal. It fits especially when something was previously secret, hidden, or unclear and then becomes clear. In everyday language, 'zeigen' is usually more natural; 'offenbaren' is used more for important information, inner feelings, or surprising truths.

Nach dem langen Streit offenbarte sie endlich den wahren Grund für ihre Wut.
After the long argument, she finally revealed the real reason for her anger.
Im Gespräch zeigt Tom seinem Freund die Fotos von der Veranstaltung.
During the conversation, Tom shows his friend the photos from the event.