What's the difference between inpainting and outpainting?

Inpainting changes a region inside the existing image; outpainting adds new canvas beyond the original edges and fills it. Outpainting is harder to keep coherent because the model has context on only one side of the new area, so direction, overlap and prompt consistency matter more.

Why does my extension drift in style or perspective?

Drift happens when you extend too far in one step or when the prompt doesn't describe the continuing scene. Extend in smaller steps (a quarter or third of the canvas at a time), keep an overlap region with the original, and re-state the same style and lighting words each pass so the model has an anchor.

What does prompt mirroring mean?

Prompt mirroring means keeping your style, lighting and quality descriptors identical across every outpainting pass while only changing the words that describe the new content. Reusing the same stylistic anchor stops the extension from sliding into a different look as you grow the canvas.

Is my image uploaded anywhere?

No. This tool only builds a text prompt and strategy advice in your browser. It does not upload, view or store your image — you perform the actual outpainting in your own model or app.

Outpainting Extension Prompt Guide

Outpainting extension prompt guide

Outpainting grows an image beyond its original edges — turning a portrait into a full scene, or a square into a wide banner. The challenge is consistency: the model only sees the original on one side of the new canvas, so style and perspective can drift fast. This guide builds a prompt and the strategy to keep the extension seamless.

How it works

Good outpainting depends on three things: a prompt that describes the whole continuing scene (not just the original crop), a sensible denoising strength, and prompt mirroring — keeping your style, lighting and quality words identical across every pass while only the content words change. This tool sets the direction context, assembles a continuation prompt, and recommends a denoise band plus an overlap-and-steps strategy for the extension you’re doing.

Tips and notes

Extend in steps. Add a quarter or third of canvas at a time. One giant expansion is where drift and repetition come from.
Keep an overlap. Most tools let you overlap the new region with the original by a strip of pixels — that shared context is what makes the seam vanish.
Mirror your style words every pass. Identical lighting/style/quality tokens each time anchor the look so it doesn’t wander.
Describe the scene, not the crop. Tell the model what logically continues off-frame — more sky above, more floor below, the rest of the room to the side.