FLUX 1.1 Pro and FLUX 1.1 Pro Ultra – Text to Image Online
flux-3image is an independent web app that lets you generate images from text with Black Forest Labs' FLUX1.1 [pro] and FLUX1.1 [pro] Ultra models.
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Text to image with FLUX1.1 [pro].
What is FLUX 1.1 Pro?
FLUX1.1 [pro] is a text-to-image model from Black Forest Labs' FLUX.1 generation, released in 2024. You type a prompt and get one image, usually about 1 megapixel. BFL describes it as fast and reliable, with strong prompt adherence. FLUX1.1 [pro] Ultra is the high-resolution version, at about 4 megapixels per image.
FLUX 1.1 Pro was the model many "FLUX Pro AI" tools were built on before Kontext, FLUX.2 and FLUX 3 arrived. People still choose it because they know how it responds to prompts, and because a plain text-to-image job doesn't need an editing model.
- Models
- FLUX1.1 [pro] and FLUX1.1 [pro] Ultra by Black Forest Labs, called through the fal API
- Mode
- Text to image only; no reference images or editing on this page
- Output size
- [pro]: about 1 megapixel (1K) · Ultra: about 4 megapixels (2K), including 21:9 panoramas
- Waiting
- Results usually arrive while you stay on the page; Ultra images take longer
- Credits per image
- FLUX 1.1 Pro: 4 · Ultra: 5
- Commercial use
- Allowed for all users, per our Terms
- What it can't do
- No photo editing, no multi-reference, no 4K; use FLUX 3 Image or FLUX.2 for those
Clean illustration from a short prompt
The model handles graphic styles as well as photos. The lighthouse came from a short prompt asking for a flat vector-style illustration with a limited palette of navy, coral and cream. The model kept to those three colors, used clean geometric shapes and left the composition simple enough for a poster or a blog header.
For flat illustration, name the palette and say "clean shapes" or "flat vector style". Leave out camera terms, which push the model back toward photography.
- Short prompt
- Flat style
Food and product photos at 1K
This top-down ramen shot is a standard FLUX 1.1 Pro result at 1K. The soft-boiled egg, the noodle texture and the glossy broth all hold up at full size, and the slate surface gives the dark, moody look the prompt asked for.
At 1K, it is a solid choice for blog images, menu drafts and social posts. When you need a larger file for print or a wide banner, move the same prompt to Ultra.
- Top-down
- 1K
What is the difference between FLUX 1.1 Pro and Ultra?
Ultra makes larger images. A standard FLUX1.1 [pro] image is about 1 megapixel, while Ultra outputs about four megapixels and supports wide formats such as 21:9. Both versions are text to image only on flux-3image. Ultra costs more credits per image than the standard model.
Is FLUX 1.1 Pro free?
It is not free on flux-3image. Each image costs credits, because every request is a paid call to Black Forest Labs' model through the fal API. Accounts created with Google sign-in get a few free credits, enough for a first test. Ultra costs more credits per image than the standard model.
Wide panoramas with FLUX1.1 [pro] Ultra
This panorama is an Ultra image at 21:9, about 3,100 pixels wide. At that size the peaks stay sharp edge to edge, and the tiny lit cabin on the right shore is still a recognizable cabin. Wide Ultra images work well as website headers, desktop wallpapers and print panoramas.
- 21:9
- About 4 MP
Candid street photos with Ultra
People photos benefit from Ultra's extra pixels. This flower-stall scene is a 2:3 Ultra image of about 4 megapixels. The man's laugh, the wool texture of his coat and every tulip in the buckets stay sharp. The overcast light gives the soft, even look of a real morning on the street.
To get a candid feel, describe the moment rather than the pose ("laughing while buying tulips") and add photographic cues such as "natural colors" and "slight film grain". Ask for "no signs or text" when you want a clean background, because street scenes otherwise tend to fill up with invented lettering.
- Candid
- Natural light
How to use FLUX 1.1 Pro
- 1
Choose FLUX1.1 [pro] for 1K images, or FLUX1.1 [pro] Ultra for about 4 megapixels.
- 2
Write the prompt
Lead with the subject, then style, setting, light and camera.
- 3
Pick an aspect ratio
Ultra's wide ratios such as 21:9 suit banners and panoramas.
- 4
Generate
Run the prompt on the standard model first, then render the keeper on Ultra.
FLUX 1.1 Pro or a newer FLUX model?
Black Forest Labs now recommends FLUX.2 for most new work, and FLUX 3 Image is the newest model of all. Pick a newer model when you need to edit a photo, combine reference images, render readable text or reach 4K. Stay with FLUX 1.1 Pro when you want plain text to image from a model whose behavior you already know.
Plain text to image, familiar results
- Model
- FLUX1.1 [pro]
Large or wide images from text
- Model
- FLUX1.1 [pro] Ultra
Photoreal images plus editing
- Model
- FLUX.2 [pro]
1–10 references, 4K, precise edits
- Model
- FLUX 3 Image
Frequently asked questions
Is FLUX 1.1 Pro the same as FLUX.1 Pro?
- No. FLUX.1 [pro] was the first FLUX professional model. FLUX1.1 [pro] is its successor from the same FLUX.1 generation, with better image quality and prompt adherence. flux-3image runs FLUX1.1 [pro] and its Ultra mode.
What resolution does FLUX 1.1 Pro Ultra support?
- Ultra generates images of about 4 megapixels. In our tests, a 21:9 Ultra image came out at 3,136 × 1,344 pixels, and a 2:3 image at 1,664 × 2,496 pixels.
Can FLUX 1.1 Pro edit photos?
- Not on flux-3image. This page is text to image only. To edit a photo, use FLUX.1 Kontext for single-photo edits, FLUX.2 Pro or FLUX 3 Image for edits with several references.
Is FLUX 1.1 Pro Ultra worth the extra credits?
- Yes, when the image will be shown large: website headers, posters, wallpapers or prints. Ultra gives about four times the pixels of the standard model. For social posts and drafts, standard FLUX1.1 [pro] at 1K is usually enough.
How many credits does FLUX 1.1 Pro use?
- The standard model costs 4 credits per image, and Ultra costs 5. The exact cost shows on the Generate button before you click.
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