Please download promptly — images are stored temporarily and long-term retention is not guaranteed.
Creations may be featured in the system showcase — opt out per image under My creations or with the switch above.
This session
Dedicated 4K tier
A dedicated server-side 4K tier returns a high-resolution original — no client-side 2K stretching needed.
Images in minutes
Usually about 1–3 minutes, with automatic retries when busy; failed generations are not charged.
Pay as you go
Pay only for what you use — no plan lock-in, balance always available.
Commercial use
Generated images are cleared for commercial projects.
How to prompt
Great images do not come from keyword stuffing: one focal point, one environment, one lighting system
① Output & viewpoint
Start with the intended output, then establish the viewpoint: “Breathtaking 4K desktop wallpaper: aerial view of…” Wallpapers, portraits and posters need different compositions.
② One coherent scene
Keep one focal point and one environment. Details may be rich, but they must reinforce the same scene instead of competing as separate hero subjects.
③ Color, light & depth
Use visible cues: teal-to-deep-blue gradients, golden sunrise, volumetric rays, layered haze and crisp reflections. Concrete optics beat vague superlatives.
④ One consistent finish
Close with a short, consistent finish: ultra detailed, cinematic, photorealistic, 8k quality. Avoid mixing photographic, oil-paint and anime treatments.
A prompt structure validated by real generations
Output type + viewpoint + one core scene + 2–4 related elements + color and light + depth or reflections + one consistent finish. English is optional, but a mature prompt is best kept intact rather than expanded again.
Breathtaking 4K desktop wallpaper: aerial view of a turquoise tropical lagoon, coral atolls, crystal clear gradient water from teal to deep blue, white sand, a few palm islands, ultra detailed, cinematic, photorealistic, 8k quality
Breathtaking 4K desktop wallpaper: a misty pine forest valley at golden sunrise, layered ridges fading into haze, volumetric god rays through the trees, a soft sun flare, ultra detailed, cinematic, photorealistic, 8k quality
Breathtaking 4K desktop wallpaper: vivid green and violet aurora borealis dancing over snowy mountains and a frozen mirror lake, star-filled night sky, crisp reflections, ultra detailed, cinematic, photorealistic, 8k quality
Resolution controls canvas size; the prompt controls visual detail. Validate composition in 2K, then reuse the same prompt in 4K for the final render.
API access
Standard REST endpoint, pay-as-you-go. Try it in the playground above first.
Endpoint
POST https://llmapi.pro/v1/images/generations
Authorization
Authorization: Bearer <metered API key>
This endpoint requires a metered (pay-as-you-go) API key — subscription plan keys cannot call it.
Get a metered key →
Choose an image tier
image22K · ¥0.08 / image
Best for composition drafts, social images and fast iteration. Lock subject, viewpoint and lighting before moving to 4K.
image2-4k4K · ¥0.15 / image
A dedicated high-resolution tier for wallpapers, final delivery and zoomable work. Higher resolution cannot repair an overcrowded composition.
Both tiers use the same prompting method. The service retries and switches available capacity during transient congestion; only successful image responses are charged.
cURL
curl https://llmapi.pro/v1/images/generations \
-H "Authorization: Bearer $LLMAPI_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "image2-4k",
"prompt": "Breathtaking 4K desktop wallpaper: vivid green and violet aurora borealis dancing over snowy mountains and a frozen mirror lake, star-filled night sky, crisp reflections, ultra detailed, cinematic, photorealistic, 8k quality",
"n": 1
}'
JavaScript (fetch)
const res = await fetch("https://llmapi.pro/v1/images/generations", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.LLMAPI_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
model: "image2-4k", // 4K · ¥0.15 · image2=2K · 返回 b64_json
prompt: "Breathtaking 4K desktop wallpaper: vivid green and violet aurora borealis dancing over snowy mountains and a frozen mirror lake, star-filled night sky, crisp reflections, ultra detailed, cinematic, photorealistic, 8k quality",
n: 1,
}),
});
const data = await res.json();
// 图片以 base64 (b64_json) 内联返回（无外链）
const b64 = data.data[0].b64_json;
const buf = Buffer.from(b64, "base64"); // -> 保存为 .png
Pay-as-you-go. Body fields: model, prompt, n (1–9 images); both image2 and image2-4k models are available.
Pick resolution by model name: image2=2K, image2-4k=4K; images return inline as b64_json.
FAQ
How much per image?
2K is ¥0.08/image and 4K is ¥0.15/image. Pay-as-you-go, only for what you use.
Should I choose 2K or 4K?
Use 2K for low-cost composition drafts and 4K for the final render. 4K provides a larger canvas, while fine detail still depends first on a focused prompt.
How long does generation take?
Usually about 1–3 minutes depending on quality and channel load. You may leave the page; completed images appear under My creations.
Can I use images commercially?
Yes — images from Image2 can be used in commercial projects.
How do I top up?
Log in and top up on the API billing page to fund image generation.