Outpaint (Expand)

Expand the canvas of an image with AI-generated content that matches the existing scene. Specify percent expand on each side — required so the customer is intentional.

By Runflow

Pricing: $0.55 per request

Overview

**Outpaint (Expand)** grows the canvas of an image with AI-generated content

that matches the existing scene. Specify how many percent to expand on each

of the four edges; the pipeline runs a context-aware fill plus multi-stage upscaling and

returns a coherent result up to 4096px on the long side.

How it works

Provide an image URL and four expand-percent values (0–80 each). The pipeline

generates plausible scene continuations, applies the context-aware pass, then

applies a tea-cached upscaler pass for sharpness.

Common use cases

• Aspect-ratio adaptation — turn 4:3 into 16:9 without cropping the subject
• Scene extension — add headroom or footroom for typography
• Reposition for layouts — extend the canvas instead of cropping

API call shape

```json

POST /v1/models/runflow/outpaint/runs

{ "image_url": "https://…/photo.jpg",

"expand_top": 30, "expand_bottom": 20,

"expand_left": 20, "expand_right": 20 }

```

Examples

• 10-couple-half-frame
• 01-portrait-tight-headshot
• 02-product-watch-tight
• 04-portrait-shoulder-cut
• 05-food-bowl-zoom
• 06-cityscape-asymm-crop
• 07-portrait-square-platform
• 08-bird-perch-tight

Frequently asked questions

What is Outpaint (Expand)?

A first-party Runflow workflow that grows the canvas of an image with AI-generated continuation matching the existing scene. Specify percent-expand for each of the four edges.

How much does Outpaint cost on Runflow?

Simple fixed pricing: $0.55 per image. Higher than basic edits because outpainting is multi-stage (Flux fill + upscaling).

What is the maximum output resolution?

Up to 4096px on the long side after upscaling.

Can I expand only some edges?

Yes. Set per-side values to 0 for edges you don't want to grow. All four values are required.

How long does an outpaint take?

90–180 seconds depending on image size and expand magnitude.

Can I use the outputs commercially?

Yes. Commercial license retained.

Related models

• Multi Angles, Re-render the same subject from a different camera angle. Pick a horizontal view, a vertical angle, and a shot distance: the model rotates the camera around the subject and re-renders the scene from that pose.
• Logo Inpaint, Place a logo onto a target image, with optional mask to constrain placement. When the mask is omitted, the workflow picks a placement automatically.
• Background Replace, Swap the background of any product photo for a new scene defined by a reference image and a short prompt. The model preserves the foreground subject while matching camera angle and lighting to the new background.
• Reference Inpaint, Inpaint a region of a target photo using a reference image as the visual guide. Provide the target, a black-and-white mask of the area to fill, and a reference image. The model paints the masked region with content matching the reference.

Discoverable surfaces

• Dispatch endpoint: POST https://api.runflow.io/v1/models/outpaint/runs
• Per-model spec (markdown): https://app.runflow.io/models/outpaint/llms.txt
• Docs page: https://docs.runflow.io/models/outpaint
• Public OpenAPI spec: https://docs.runflow.io/api/openapi.public.json
• Agent skill (start here): https://www.runflow.io/.well-known/agent-skills/runflow/SKILL.md