Flux Subject
Flux Subject turns a text prompt into an image. Pick a mode, write the prompt, run it in the studio.
Input
FormPrompt*
Image Url*
Image Size
Num Images
Result
Preview
Illustrative preview, not Flux Subject output
Credits·~10s
What Flux Subject is for
Flux Subject from Black Forest Labs is a text-to-image model. You describe the frame and it returns a still image in about 10 seconds, billed at Credits. There is one mode on this page: text to image.
Flux Subject is cheap enough that a generation usually fits the free Knowlify plan's credits. A typical run is about 10 seconds.
Pick Flux Subject for text to image at Credits and ~10s. Compare it with Flex, Flux, Flux 1 on the related cards below if you need a different look, speed, or input type.
How to use Flux Subject
- 1. Upload the still Flux Subject should start from, then write the change or motion in Input.
- 2. Run it. The prompt and file hand off to the Knowlify studio, where Flux Subject generates.
- 3. Stay in the studio if you want that frame or clip inside a longer narrated video.
What you need
- A prompt that names the subject, style, and framing.
- A source still (PNG or JPG) for the model to start from.
- Image Size (square_hd, square, portrait_4_3, portrait_16_9, and more).
Example prompt
a barefoot runner on a salt flat, heat shimmer, wide, fashion film still, anamorphic, teal and gold, no text, no watermark
Frequently asked questions
How do I run Flux Subject?
Run Flux Subject on Knowlify at /generate/flux-subject. Write the prompt on this page and it opens in the studio, where Flux Subject generates a still image. The same studio also turns documents into full narrated videos.
Where can I use Flux Subject online?
On Knowlify (Black Forest Labs's model, knowlify.com/generate/flux-subject). You do not need a separate playground. Flux Subject runs in the studio next to document-to-video.
Can I make a longer video with Flux Subject?
Flux Subject itself produces a still image. On Knowlify you can take that output, or skip it and upload a document, and generate a full narrated video with a script you can edit.
What do I need to run Flux Subject?
A prompt and a source still. Flux Subject will not invent the starting frame for you on this mode.
How long does Flux Subject take?
Plan on about 10 seconds for a typical run, then whatever queue time the studio has. Video models sit at the high end of that range.
What does FLUX.1 Subject cost?
Knowlify charges this as credits, at the compute cost.
What is FLUX.1 Subject best for?
Super fast endpoint for the FLUX.1 [schnell] model with subject input capabilities, enabling rapid and high-quality image generation for personalization, specific styles, brand identities, and product-specific outputs. It turns a text prompt into an image.
Do I need an account to use FLUX.1 Subject?
Yes, a free account. The prompt you write here is waiting for you when FLUX.1 Subject opens in the studio.