Flux 3 | Edit.

Flux 3 Edit Overview

Flux 3 Edit transforms reference images with text instructions for restyling, visual edits, and new compositions, with selectable output sizes on each::labs.

Reference images and a prompt define the requested edit, with selectable output dimensions.

Flux 3 Edit from Black Forest Labs is available through each::labs in the flux-3 family. Required fields are prompt, image_urls.

aspect_ratio: Aspect ratio of the generated image. resolution: Output size: 768sq (~0.6 MP, 768x768 at 1:1), 1k (~1 MP), 2k (~4 MP) or 4k (~16 MP).

Use the Flux 3 Edit API when you need this transformation or analysis as a repeatable step in an application or creative pipeline. The sections below distinguish the required material, adjustable controls and checks that matter before delivery.

Capabilities

• Reference images and a prompt define the requested edit, with selectable output dimensions.
• aspect_ratio: Aspect ratio of the generated image.
• resolution: Output size: 768sq (~0.6 MP, 768x768 at 1:1), 1k (~1 MP), 2k (~4 MP) or 4k (~16 MP).
• grounding: Let the model research the prompt with web and image search before generating.
• image_urls: 1 to 10 reference images to edit or combine.

Use Cases for Flux 3 Edit

Flux 3 Edit is useful when this specific operation fits between source preparation and delivery. These scenarios show how it can support different parts of a working pipeline.

Creators

Revise a hero image. Use a representative source or a concise brief, then inspect the result before preparing a larger set of assets.

Design and marketing teams

Create alternate backgrounds. Compare the result with the intended message, composition and destination. Keep reviewable versions of the source and output.

Developers

Explore a new composition from existing visual references. Inspect the actual returned value before connecting it to another step, and keep the chosen request settings with the result.

Start with a clear definition of the desired result and use the exposed controls to reach it. Keep any additional generation, editing or application logic in separate steps so that the effect of this operation remains easy to review.

Tips and Tricks

Make the main subject, composition, lighting and intended visual style unambiguous. When references are available, state which details should be retained and which should change. Start with one clear creative direction before adding several competing requests.

• resolution: Output size: 768sq (~0.6 MP, 768x768 at 1:1), 1k (~1 MP), 2k (~4 MP) or 4k (~16 MP).
• grounding: Let the model research the prompt with web and image search before generating.

• Example direction: “Replace the background with a softly lit studio; keep the subject, colors and framing unchanged.”
• Example direction: “Make the lighting warmer while preserving the main subject and its visible details.”

Compare one deliberate adjustment at a time. Inspect the part of the result affected by that change, then check the rest of the asset or response for unwanted side effects before reusing the settings.

Technical Specifications

• Result type: image.
• Required fields: prompt, image_urls.
• aspect_ratio: string; options auto, 21:9, 2:1, 16:9, 3:2, 7:5, 4:3, 5:4, 1:1, 4:5, 3:4, 5:7, 2:3, 9:16, 1:2, 9:21; default "auto".
• resolution: string; options 768sq, 1k, 2k, 4k; default "1k".
• prompt: string.
• grounding: boolean; default true.

image_urls: 1 to 10 reference images to edit or combine.

Values must use the types and accepted options listed in the parameter reference. A displayed default does not remove a required-field requirement. Choose a supported output setting for this entry rather than borrowing a preset from a related model.

Things to Be Aware Of

Review lettering, small structures, edges and any requested product details at the intended display size. An attractive first impression is not enough to establish that a visual matches its brief.

Optional settings are not necessarily interchangeable with those on another entry in the same family. Use the accepted names, types and values shown for this operation.

For media-based inputs, supply a directly retrievable file URL rather than a page containing the asset. Keep the source available while processing. Check the final content in the destination player, editor or application, not only the request status.

Key Considerations

Describe what should remain unchanged as well as what should change; inspect the result rather than assuming perfect preservation.

Public estimate: $0.041–$0.607 per execution.

Prepare prompt, image_urls before starting. Optional settings include aspect_ratio, resolution, grounding. Keep these settings aligned with the intended delivery, especially when a later step expects a particular type or format.

Run a representative request before scaling to a larger collection. Judge the result against the source and the brief, and account for all generated outputs or usage-sensitive options when estimating a batch.

Limitations

• image_urls: minimum items: 1; maximum items: 10; item string; item format: uri.
• aspect_ratio: allowed values: ["auto", "21:9", "2:1", "16:9", "3:2", "7:5", "4:3", "5:4", "1:1", "4:5", "3:4", "5:7", "2:3", "9:16", "1:2", "9:21"].

Unsupported parameters do not establish additional capabilities. A generated result can differ from the intended brief, so review detail and consistency before publication.