Hochstapler (m)

ˈhoːxˌʃtaːplɐ

A Hochstapler deliberately assumes a false identity or claims credentials they have never earned, often sustaining the deception for years with considerable skill. The best English equivalent depends on whether the focus is on the false persona, the fraudulent gain, or the pretense of expertise.

1. impostor

Best when the deception centers on a fabricated identity or credentials, e.g., a fake doctor, officer, or nobleman.

Der Hochstapler hatte jahrelang als Chirurg praktiziert, ohne je Medizin studiert zu haben.
The impostor had worked as a surgeon for years without ever having studied medicine.

Sie entlarvte den Hochstapler, als er Details seiner angeblichen Biografie nicht kannte.
She exposed the impostor when he couldn't recall details of his supposed biography.

2. con artist [informal]

Emphasizes the scheming and manipulation for personal gain, the right choice when the deception is primarily about money or material profit.

Der Hochstapler hatte Dutzende älterer Menschen um ihre Ersparnisse gebracht, bevor er aufflog.
The con artist had swindled dozens of elderly people out of their savings before he was caught.

Mit seiner überzeugenden Art war er ein geborener Hochstapler.
With his persuasive manner, he was a born con artist.

3. charlatan · figurative

Fits when someone pretends to possess professional expertise they lack, especially in medicine, science, or advisory roles.

Der selbsternannte Wunderheiler war ein klassischer Hochstapler, der mit leeren Versprechen Geld machte.
The self-proclaimed miracle healer was a textbook charlatan who made money on empty promises.

Wer seine Behauptungen nicht belegen kann, ist kein Experte, sondern ein Hochstapler.
Anyone who cannot substantiate their claims is not an expert but a charlatan.

Notes

The word literally evokes 'stacking high', piling up lies, bogus titles, or fabricated status. English has no single word that captures this image: 'impostor' stresses the false identity, 'con artist' the deceptive scheme, and 'charlatan' the pretense of expertise. All three are genuine translation options; context determines which fits best.