grafisch
graphic
Relates to visual representation through drawing, printing, design, or computer graphics.
Die Agentur ist auf die grafische Gestaltung von Webseiten spezialisiert.
The agency specializes in the graphic design of websites.

graphic
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graphic
Relates to visual representation through drawing, printing, design, or computer graphics.
Die Agentur ist auf die grafische Gestaltung von Webseiten spezialisiert.
The agency specializes in the graphic design of websites.

Although 'grafisch' often corresponds to the English 'graphic', it does not have the English word's second meaning of 'very detailed and explicit', especially in depictions of violence. For that, German would use words like 'drastisch' (graphic/explicit) or 'explizit' (explicit).
Die Präsentation enthält viele grafische Elemente zur Veranschaulichung.
The presentation contains many graphic elements for illustration.
The adjective 'grafisch' is derived from the noun 'die Grafik' (graphic/graphics). Anything that has to do with creating graphics or the type of graphics can be described as 'grafisch' (graphic).
Er hat ein großes Talent für alles Grafische.
He has a great talent for everything graphic.
In the meaning of 'design', 'grafisch' is often combined with nouns such as 'Gestaltung' (design), 'Design' (design), 'Darstellung' (representation), or 'Oberfläche' (interface/surface), for example in software.
Die grafische Benutzeroberfläche der App ist sehr intuitiv.
The app's graphical user interface is very intuitive.
When it comes to data, 'grafisch' is often used with verbs like 'darstellen' (to represent), 'aufbereiten' (to prepare), or 'auswerten' (to evaluate). It describes the conversion of numbers into a visual diagram.
Können Sie diese Zahlen bitte grafisch darstellen?
Could you please represent these numbers graphically?
visual / optical
'optisch' and 'grafisch' both have to do with seeing and visual impressions. 'optisch' generally describes how something looks or how it is perceived with the eyes. 'grafisch' is more suitable when something is represented through drawing, design, print, computer graphics, or a diagram. The words can be confused because both often occur with images, websites, or presentations. As a simple guide: when it is about the outward impression, 'optisch' is more natural. When it is about a designed or drawn representation, 'grafisch' is more precise.

Die Zahlen im Bericht werden grafisch als Balkendiagramm dargestellt.
The figures in the report are shown graphically as a bar chart.
Die neue Lampe passt optisch gut ins Wohnzimmer.
The new lamp visually fits well in the living room.