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Flux 2 Flex: Precision Image-to-Image Generation & Control

blackforestlabs/flux-2/flex/edit

Edit and restyle images with precision using Hex codes and multi-reference blending. Upload up to 10 source images to guide style transfer, color swapping, and composition refinement.

The prompt to generate an image from.
Image 1
List of URLs of input images for editing.
The size of the generated image. If auto, the size will be determined by the model. For custom image sizes, width and height can be passed as an object.
The format of the generated image.
The guidance scale to use for the generation.
The number of inference steps to perform.
The seed to use for the generation.
Whether to expand the prompt using the model's own knowledge.
Idle
The rate is $0.12 per image.

Introduction to Flux 2 Flex Image to Image

Flux 2 Flex Image to Image is an advanced visual modification tool that allows you to remix, recolor, and restyle existing images with professional accuracy. Leveraging the Flux 2 architecture, it excels at understanding "Change X to Y" instructions, enabling you to swap colors using Hex codes, modify specific objects, or blend styles from up to 10 reference images. It is the ultimate playground for rapid A/B testing, color grading, and creative iteration on your existing visual assets.

Flux 2 Flex on X: Visual Insights and Updates

Key Capabilities

  • Precise Recotoring: Change the color of specific objects using exact Hex codes (e.g., "Change the car from red to #1E90FF blue") without affecting the rest of the image.
  • Multi-Reference Blending: Upload up to 10 image_urls to influence the generation. Use this to blend the composition of Image A with the texture of Image B and the lighting of Image C.
  • Text-Guided Editing: Modify scene elements using natural language (e.g., "Add a hat," "Remove the glasses") while preserving the subject's identity and pose.
  • Style Transfer: Apply a new artistic style to a photo (e.g., "Make it look like a pencil sketch") while keeping the original structure intact.

How to use Flux 2 Flex Image to Image

  1. Upload Sources: Add your base image(s) to the image_urls list.

- Single Image: Standard editing.

- Multiple Images: The model will blend features from all inputs.

  1. Write Edit Instruction:

- Specific Change: "Change the background to a beach."

- Style Change: "Transform into a cyberpunk style."

- Color Change: "Change the flowers to #FF69B4 pink."

  1. Tune Intensity:

- Guidance Scale 3.5: Standard editing.

- Guidance Scale 7.0+: Forcefully applies the prompt, potentially changing more of the original structure.


Pro Tips

  • Hex Code Power: Flex is one of the few models that respects Hex codes in editing. Use this for precise brand asset updates.
  • Multi-Input Order: When using multiple images, the model often prioritizes the style/content of the first image in the list slightly more.
  • Magic Prompt: For precise edits (like color swapping), turn enable_prompt_expansion OFF to prevent the AI from adding unwanted extra details that might interfere with your specific change.

Related Tools

  • To create designs from scratch using Hex codes, use Flux 2 Flex Text to Image.

Related Playgrounds

qwen-edit-2509/multi-image-edit-plus

Advanced image editing model for detailed, consistent visual creation and precise design workflows.

sam-3/image-to-image

Advanced concept-driven image editing with unified segmentation and detection for creators.

qwen-edit-2509/lora/inscene

Advanced AI editing merges scenes and styles with precise structure control for designers.

imagen-4/fast/text-to-image

Generate images fast from text with Google Imagen 4 Fast.

qwen-edit-2509/lora/edit-skin

Redefine creative edits with dual-input precision and adaptive control for design professionals

z-image/turbo/image-to-image

High-speed image transformation with precision lighting and bilingual prompt support.

Frequently Asked Questions

What is Flux 2 Flex and how does its image-to-image feature work?

Flux 2 Flex is an advanced model by Black Forest Labs designed for both text-to-image and image-to-image generation. The image-to-image function lets users edit or rebuild existing visuals with high precision and creative control, producing detailed, photorealistic, or stylized outputs.

Who should use Flux 2 Flex for image-to-image projects?

Flux 2 Flex is ideal for professional creators, designers, and marketing teams who need consistent brand visuals and detailed image-to-image editing. It’s especially useful for projects requiring precise typography, color accuracy, and style consistency.

How do I access Flux 2 Flex and start doing image-to-image generation?

You can access Flux 2 Flex via Runcomfy’s AI playground after logging in. Once you have an account, you can start using its image-to-image capabilities by uploading reference images or using structured text prompts to create or edit images.

Is Flux 2 Flex free or do I need credits for image-to-image editing?

Flux 2 Flex can be used through Runcomfy’s playground, where new users receive free trial credits. Continued image-to-image generation requires spending credits according to the site’s usage policy outlined in the Generation section.

What makes Flux 2 Flex different from other image-to-image AI models?

Flux 2 Flex stands out with its precise color matching (including hex control), multi-image referencing, structured JSON prompting, and exceptional text rendering. Compared to other image-to-image tools, it provides finer creative control and higher output fidelity.

What input and output formats does Flux 2 Flex support for image-to-image work?

Flux 2 Flex supports common formats like JPEG and PNG as input, and outputs high-resolution PNG files. This ensures compatibility and quality when doing image-to-image creations or edits.

How does Flux 2 Flex ensure quality in image-to-image generation?

Flux 2 Flex allows control over inference steps and guidance scale, which lets users balance speed and quality. Its image-to-image mode excels at photorealism, detailed textures, and maintaining visual consistency across assets.

Are there any limitations of Flux 2 Flex when performing image-to-image tasks?

While Flux 2 Flex delivers outstanding detail and control in image-to-image generation, it may have higher latency than lighter models. It’s optimized for quality over speed and works best when avoiding negative prompts.

Can I use Flux 2 Flex on mobile devices for image-to-image editing?

Yes, the Flux 2 Flex interface available on Runcomfy’s website works well on mobile browsers, allowing you to perform image-to-image editing and generation conveniently from your phone or tablet.

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