Do I need to write a prompt at all?

No. Selecting a mode, a room type, and one of the 36 styles is enough for most designs. Add a prompt when you need something the style name cannot express, such as keeping a specific existing element.

How do I tell the AI to keep my existing furniture?

Say so directly in the prompt, naming the piece: keep the existing grey sofa. For finishes rather than furniture, the focused modes are more reliable than a prompt, since Change wall and Change floor touch only one surface by design.

Why was my prompt rejected?

Most likely it contained a structural request such as open plan or remove wall, or a camera term such as zoom or perspective. Both categories are blocked because they would break the guarantee that the render shows your actual room.

What should I write in the prompt box?

Last updated August 30, 2026

The prompt is optional. Choosing a style and a mode is often enough, and a bad prompt does more damage than no prompt at all. Where a prompt earns its place is in the specifics a style name cannot carry: the sofa you want to keep, the oak floor that should survive, the exact green you have already bought paint for.

Three rules #

Describe furniture, decor, materials, lighting, and color. Leave out people, animals, and anything violent or adult. Leave out logos, watermarks, and text overlays. Those are the three published guidelines, and everything else is preference. The limit is 1000 characters, which is far more room than a good prompt needs.

Name what stays, not just what changes #

The most useful sentence in most prompts is the one protecting something. Keep the existing oak flooring is a clearer instruction than any amount of description of what you want added, because it tells the model where the boundary is. Anchoring one or two real elements also makes the result easier to trust, since you can check them at a glance.

Weak prompts and stronger rewrites #

Weak	Stronger
Make it look nice	Warm minimalist living room, cream boucle sofa, light oak coffee table.
Modern	Pick the Modern style instead. A one-word prompt adds nothing the style already carries.
Change everything	Keep the windows and flooring. Replace the sofa and rug with warm neutral pieces.
Open up the space	Rejected: open plan is a structural request. Try a lighter palette and fewer pieces.
Make it brighter and take it from the other side	Rejected: camera terms are blocked. Ask for brighter, and re-shoot for the other angle.

Be specific about materials, vague about arrangement #

Materials and colors take direction well: brushed brass, unlacquered, matte black, warm white oak, ribbed glass. Spatial arrangement takes it badly, because the layout is constrained by the room you photographed. Sofa against the left wall will often be ignored or produce something awkward, since the model is working within a fixed floor plan.

One change at a time #

A prompt asking for six changes usually delivers three of them well and three badly, and you cannot tell which instruction caused which problem. Two passes with two clear prompts beats one pass with a long one, and it also makes it obvious which step to redo.

Your first 3 designs are free, no card needed.

Try it on your room

Modes this applies to

Restyle a Room Generate a Room From Text Match an Inspiration Photo

Or see every design mode grouped by the job it does.