What is a prompt-based image editing API?

A prompt-based image editing API is a web service that edits images from natural language instructions. You send an image and a text prompt — e.g. 'change the shirt color to navy blue' — and receive the edited image. No masks, no selection tools, no Photoshop skills required. Used by ad platforms, design tools, and ecommerce catalogs to enable text-to-edit at scale.

How does natural language image editing work?

The API combines vision-language understanding with controlled image generation. The model parses your prompt to identify the target region and transformation, then regenerates only that region while preserving the rest of the image — lighting, perspective, and surrounding context stay intact.

What kind of edits can I make?

Color changes, texture swaps, object modifications, background adjustments, styling changes, pattern swaps, and compositional tweaks. If you can describe it in words, the API can attempt it. Complex multi-object scenes or highly abstract prompts may require more specific wording.

Do I need to provide a mask?

No. The API automatically identifies which region of the image to edit based on your text prompt. No bounding boxes, no manual annotation, no pre-processing required.

How specific do my prompts need to be?

Clear, specific prompts produce the best results. 'Change the shirt color to navy blue' works better than 'make it blue'. Name the object, the target attribute, and the change — the more anchors in the prompt, the more precise the edit.

What if my prompt doesn't produce the expected result?

Refine the prompt and re-run — each call is a fixed $0.10/image. The API returns consistent outputs for the same prompt, so you can iterate and converge on the right result quickly. Contact us for enterprise controls like guided editing or A/B evaluation.

How much does the prompt editing API cost?

$0.10 per image with simple fixed pricing. Sign up and get $10 in free GPU credits to try it out. Contact us for volume pricing on bulk workloads.

Can I process images in bulk?

Yes. Batch endpoints with async webhook delivery. Process thousands of images per job — ideal for catalog variations, campaign rollouts, and platform migrations.

What image formats are supported?

JPEG, PNG, and WebP. Output format depends on the solution.

Typical response times are under 5 seconds for standard resolution images.

How does pricing work?

Simple fixed per-call pricing. No GPU costs, no infrastructure to maintain.

Live

Ad Creative

Photoshop-grade edits without the Photoshop team

Prompt Based Image Editing API

Edit images with natural language instructions. Add text-based image editing to your ad platform, design tool, or creative product with one API call.

Get API access

Start with $10 in free GPU credits on signup — no commitment

Before

After

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BetterPic·Read case study

Used by AI product builders shipping visual features on Runflow — see how BetterPic scaled.

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Average processing time

$0.10

Per image, fixed pricing

4096px

Max resolution supported

No masks

Zero annotation needed

How it works

No pipeline to build, no models to configure.

Send image + prompt

Pull your image and describe the edit in plain English. e.g., 'Change the shirt color to navy blue.'

AI applies the edit

Runflow's pipeline identifies the target region, applies the described change, and preserves everything else.

Get your edited image

Receive the modified image with your prompt applied. Re-run with a refined prompt if you want a different result — each call is $0.10/image.

Describe the edit, get the result

No masks, no selection tools, no Photoshop skills. Just describe what you want changed in plain English and the AI applies the edit while preserving the rest of the image.

Natural language instructions — no technical input

AI identifies what to change and what to preserve

Works for color, texture, object, and scene edits

Targeted edits that preserve context

The AI modifies only the relevant region of the image. Surrounding context, lighting, and perspective stay intact. The edit looks natural, not composited.

Preserves lighting, shadows, and perspective

Only the described region is modified

No visible editing artifacts

Creative and production workflows

Generate product variations, adjust ad creative, or fix styling issues without reshooting. One prompt per edit, at scale.

Generate color variations of product shots

Adjust styling, props, or environments in ad creative

Fix minor issues without reshooting

Simple API, powerful results

Send an image and a text prompt. The API returns the edited image. No model training, no fine-tuning, no prompt engineering expertise required.

Image + text prompt = edited result

No model training or fine-tuning

Works with any standard image format

Prompt-based editing for every creative workflow

From ad platforms to design tools. Edit images with words instead of tools.

Ad Creative Platforms

Generate ad variations from a single asset — change backgrounds, colors, props, or subjects with text prompts. A/B test faster without reshooting. Think: Meta Ads, Google Shopping, TikTok Ads Manager.

Ecommerce Product Catalogs

Swap garment colors, adjust product details, or fix minor issues without reshooting. Scale catalog variations at a fraction of the cost. Think: Amazon, Shopify, Flipkart.

Fashion & Apparel

Generate color, pattern, and styling variations across product lines with a single prompt. Build lookbook variations without additional photoshoots. Think: Zara, H&M, ASOS.

Design Tools & Creative Suites

Add AI-powered text-to-edit into your design product. Let users modify stock images, screenshots, or uploaded photos with a single prompt. Think: Canva, Figma, Adobe.

Content & Social Media

Quickly adapt images for platforms, seasons, or campaigns. Edit at the speed of ideation for social creators, marketers, and editorial teams.

Marketing Personalization

Generate localized or segmented creative variations at scale. Tailor product imagery to campaigns, markets, or audience segments with text prompts. Think: Klaviyo, HubSpot, Braze.

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Working with Runflow changed how we build. Our developers can integrate a new AI feature by calling an endpoint — they don’t need machine learning expertise, infrastructure knowledge, or DevOps skills. We just focus on making the best product, and Runflow handles everything underneath.