Custom Styles

Custom Styles is a feature on claude.ai that lets you control how Claude formats and delivers its responses — covering tone, vocabulary, pacing, and structural formatting. It works independently of what Claude knows or remembers; it only changes how Claude communicates, not what it knows. You can choose from built-in preset styles (Normal, Concise, Explanatory, Formal) or create your own by uploading writing samples, pasting example text, or writing explicit instructions that Claude follows every time the style is active. Custom Styles solve a specific problem: without them, you have to re-explain your preferred communication style in every prompt. With a saved style, Claude consistently matches your brand voice, technical documentation standards, or preferred tone without any extra instructions. You can create multiple styles and switch between them depending on the task — for example, switching from a concise coding style to a formal stakeholder-update style. Styles are distinct from Claude's other personalization features. Profile instructions and Project instructions give Claude context about who you are or what a project involves. Styles focus exclusively on the shape and feel of the output itself — length, formality, structure, and linguistic cadence.