FLUX 3 Klein Image Edit

FLUX 3 Klein Image Edit (Image-to-Image)

What is FLUX 3 Klein Image Edit?

FLUX 3 Klein Image Edit is Black Forest Labs' compact, open-weights image editor built on the FLUX 3 foundation. It turns a plain-language instruction plus one to ten reference images into a precise edit, so you can recolor, replace, move, resize or remove elements, composite references, or restyle a whole scene from a single API call. Built on a 5.6B-parameter distilled model, it keeps the untouched parts of your image exactly as they were, which makes it a dependable image-to-image engine for production editing pipelines and high-volume iteration.

Key Features

• •Pixel-perfect local edits — change one element and keep the rest of the frame identical.
• •Up to ten reference images — combine a subject, a background and a product into one composition.
• •Bounding boxes in the prompt — place elements or restrict changes to a region on a 0–1000 grid.
• •Whole-image restyle while preserving geometry and positions.
• •Resolution tiers up to native 4K, JPEG or PNG output, adjustable denoising steps and aspect ratio.

Best Use Cases

Teams reach for FLUX 3 Klein Image Edit for e-commerce product variants (swap colors, materials or labels without a reshoot), marketing composites (drop a logo, poster or product from a second image into a scene), interior and real-estate restyling, and concept art or style transfer. In testing, a cherry-red motorcycle's fuel tank was recolored to brushed copper while the chrome, tools, brick wall and lighting stayed pixel-identical — and the same source was composited with a poster, relocated via a bounding box, and redrawn as a blueprint, all cleanly.

Prompt Tips and Output Quality

Name the single element to change and explicitly list what to keep ("keep the … unchanged"). Refer to inputs as Image 1 and Image 2, and say where a second-image element should land. For precise placement, tag an element with <id> and append a JSON bounding box. Use 1k for most edits and 2k/4k only when fine detail matters; keep steps at 16 for full quality.

How to Use FLUX 3 Klein Image Edit

FLUX 3 Klein Image Edit works from one instruction and one to ten reference images. Put the image you want to change first, then write what to change and, just as importantly, what to keep. The model preserves untouched regions, so specific prompts produce clean, repeatable edits.

Recommended Settings

• •images — the image being edited goes first; add more references (up to 10) to combine or restyle.
• •prompt — one clear instruction; name the element to change and list what stays the same.
• •resolution — 1k for most edits, 2k or 4k when you need fine detail, 768sq for quick drafts.
• •steps — 16 for full quality (same price); lower only for fast, rough drafts.
• •aspect_ratio — auto to keep the source framing; output_format png for lossless, jpeg for smaller files.
• •seed — fix it to iterate on a single result; leave empty for variety.

Bounding boxes

For precise placement or region-restricted edits, tag an element with <id> in the sentence and append a JSON array of {id, bbox:[top,left,bottom,right]} on a 0–1000 grid plus a short desc.

Example edits to try

Each example below ran end to end at the settings above (1k, auto, jpeg) on the same tool-lined garage source, so you can compare edits on one image:

• •Local recolour. Prompt: "Recolour only the motorcycle's fuel tank from cherry red to brushed copper. Keep the chrome, the tyres, the pegboard of hand tools, the brick wall and the lighting exactly unchanged." The tank turned brushed copper while everything else stayed pixel-identical. Tip: list what to keep, not just what to change.
• •Bounding-box object move. Prompt: "Move the red helmet from the motorcycle seat onto the empty left side of the workbench top; leave the seat empty…" The helmet relocated exactly where the box pinned it. Tip: match the bbox id to a <tag> in the sentence.
• •Full restyle. Prompt: "Restyle the whole image as a hand-drawn cutaway blueprint: thin white technical lines on deep blue drafting paper…" The scene became a blueprint with every object in its original place. Tip: add "keep … in their original positions and proportions" to hold geometry.

Reference-guided edits

This model takes up to ten reference images; name each one by its position.

• •Multi-reference compositing. Images: the garage as Image 1 and a framed poster as Image 2. Prompt: "Hang the framed poster shown in Image 2 on the empty brick wall to the left of the pegboard in Image 1…" The poster appeared on the wall with correct perspective while the rest of Image 1 stayed unchanged. Tip: say exactly where the second-image element belongs.

Further edits to try: "replace the brick wall with white subway tile", "add a neon OPEN sign above the bench", "turn the whole scene into a watercolour painting".

Can it keep the rest of the image unchanged?

Yes — pixel restoration preserves untouched regions exactly.

How many reference images can I use?

One to ten, named Image 1…Image N in the prompt.

Does it support 4K?

Yes, native output up to 4K via the resolution tier.

Can I control where elements go?

Yes, with bounding boxes appended to the prompt.

Is it good for product photography?

Yes — recolor and recompose catalog assets without reshooting.