Introduction
FLUX.2 Dev LoRA Text to image draws one image from a written prompt on FLUX.2 [dev], Black Forest Labs' 32-billion-parameter open-weights model, with up to three of your own LoRA files loaded. Pick one of nine aspect ratios and the 1k or 2k tier.
Choose a mode by starting material
| What you have | Mode |
|---|---|
| a written description | FLUX.2 Dev LoRA Text to image |
| one to three photos to change or combine | FLUX.2 Dev LoRA Image Edit |
Key features
FLUX.2 LoRAs by direct link
Pass the direct link to a .safetensors file trained for FLUX.2 [dev] and a scale. Hugging Face and Civitai download links both worked in our tests; nothing is uploaded to us in advance and the file is not reviewed.
Three at once
Up to three LoRAs per request, each with its own scale. In our test a painted-interior style at 0.8, a vintage colour-photo style at 0.5 and an impressionist style at 0.4 loaded together without an error.
2k without a surcharge
Nine aspect ratios from 21:9 to 9:21 at 1k (about one megapixel) or 2k (2048 pixels on the long side).
Request parameters
| Parameter | Required | Description |
|---|---|---|
aspect_ratio | No | The shape of the frame: wide, square or tall. 1:1 · 16:9 · 9:16 · 4:3 · 3:4 · 3:2 · 2:3 · 21:9 · 9:21 · Default: 1:1 |
loras | No | Load your own LoRA files to lock in a style or character. Default: [] |
prompt | Yes | Describe the subject, setting, light and style in plain sentences. Put a LoRA trigger word first. |
resolution | No | Output size. Bigger sizes look sharper and cost more. 1k · 2k · Default: 1k |
seed | No | Reuse the same number to get a repeatable result. ≥ 0 · ≤ 2147483647 |
Pricing
Prices are in credits, the same credits you use on the website (1 credit = $0.01). The hold is taken when the task is accepted and settled to the actual charge when it finishes; failed tasks are refunded.
| Option | Credits per image | ≈ USD |
|---|---|---|
| Standard | 3.24 | $0.032 |
Each task is rounded up to whole credits, so one run at the lowest tier costs 4 credits per image ($0.04).
For an exact number before you run, send the same body to POST /jobs/quote.
Use cases
A house style for a series
Load one style LoRA, keep its trigger word at the front and run a list of prompts: every image shares the look.
Cinematic stills
Write the lens, light and colour grade and the base model alone returns film-like frames, including 21:9 and 9:21 shapes at 2k.
Testing a LoRA you trained
Run your own FLUX.2 [dev] LoRA at full quality, with up to two more files stacked, without hosting a GPU.
Prompt guide & pro tips
Trigger first, then the shot
Start with the LoRA's trigger word, such as "HST photo" or "hmrsh", then describe subject, wardrobe, place, light and lens in sentences.
Check that the LoRA applied
Run the same prompt and seed with and without the file. A style LoRA should be obvious at a glance; identical images mean the file was trained for another model.
Stay near strength 1
0.5 to 1.2 covered everything useful in our tests. At 2 the image turned soft and smeared, and at 4 it dissolved into blur.
Draft at 1k
Settle the prompt and seed at 1k, then switch to 2k for the final.
API quick start
Call the FLUX.2 Dev LoRA API in three steps
- Create an API key. Sign in to PopNow and create a key in the API console. Keys start with sk-popnow- and use the same credits as the website.
- Send the request. POST /jobs/createTask with model black-forest-labs/flux-2-dev-lora/text-to-image and an input object that follows the parameter table. The response returns a task ID straight away.
- Get the result. Poll GET /jobs/recordInfo with the task ID, or pass a callBackUrl and we post the result to it. Download the output links when the task succeeds.
# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
-H "Authorization: Bearer $POPNOW_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $IDEMPOTENCY_KEY" \
-d '{
"model": "black-forest-labs/flux-2-dev-lora/text-to-image",
"input": {
"prompt": "A ceramic teapot on a linen cloth, soft window light, muted palette",
"aspect_ratio": "1:1",
"resolution": "1k"
}
}'
# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
-H "Authorization: Bearer $POPNOW_API_KEY"Replace the prompt and any links with your own. The API tab has the response, polling and callback reference.
FLUX.2 Dev LoRA API questions
How much does the FLUX.2 Dev LoRA API cost?
FLUX.2 Dev LoRA starts at 4 credits ($0.04) per image with Create Image, its cheapest task. Credits are the same as on the website (1 credit = $0.01), new accounts get 30 free credits, and failed tasks are refunded.
What is the model name for FLUX.2 Dev LoRA in the API?
Put black-forest-labs/flux-2-dev-lora/text-to-image for Create Image; black-forest-labs/flux-2-dev-lora/edit for Edit Image in the model field of POST /jobs/createTask.
How is this different from FLUX.2 Dev?
It runs the same FLUX.2 [dev] model with a LoRA slot: up to three of your own weight files per request, in text to image and in editing. If you do not need custom weights, FLUX.2 Dev has its own page.
Do FLUX.1 LoRAs work here?
No. In our test a FLUX.1 [dev] LoRA loaded without an error and the image came back pixel for pixel identical to the run without it. FLUX.2 [dev] is a different architecture, so use files trained for it.
How many reference images can I use?
One to three in Image Edit, in the order your prompt mentions them. Write "the man from image 1" and "the woman from image 2" when you combine people, and ask to keep their faces.
What are the limits of the FLUX.2 Dev LoRA API?
Resolutions: 1K · 2K; Aspect ratios: 1:1 · 16:9 · 9:16 · 4:3 · 3:4 · 3:2 +3; Prompt length (characters): 5,000. Requests outside these limits are rejected before anything is charged.
Can I try FLUX.2 Dev LoRA without writing code?
Yes. The Playground runs FLUX.2 Dev LoRA on your PopNow credits, needs no API key, and shows the matching code for every run.
All FLUX models
FLUX.2 Dev without a LoRA slot is simpler when you don't need custom weights.
- FLUX.2 Max APITop-tier FLUX: photoreal light and exact brand colorsFrom 11 credits per image
- FLUX 3 APIVideo with synced sound and a quick draft tierFrom 45 credits for a 5-second clip
- FLUX.2 Klein 9B LoRA APIFast FLUX.2 Klein 9B that loads up to three of your LoRAsFrom 3 credits per image
- FLUX.2 Klein Base 9B LoRA APIUndistilled Klein 9B for varied looks with your LoRAsFrom 4 credits per image
- FLUX.2 Klein 4B LoRA APISmall, quick FLUX.2 Klein 4B with your own LoRAsFrom 3 credits per image
- FLUX.2 Klein Base 4B LoRA APIUndistilled Klein 4B that loads your own LoRAsFrom 3 credits per image
- FLUX.2 Klein 9B APIFast FLUX edits that keep faces and poses intactFrom 2 credits per image
- FLUX.2 Klein 4B APIThe smallest, quickest FLUX for rapid draftsFrom 2 credits per image
- FLUX.2 Dev LoRA APIFLUX.2 Dev images and edits with your own LoRAsFrom 4 credits per image
- FLUX.2 Pro APIPhotoreal images with readable text and hex color controlFrom 5 credits per image
- FLUX.2 Flex APISpells headlines and labels exactly as writtenFrom 9 credits per image
- FLUX.2 Dev APIOpen-weights FLUX that can merge people into one sceneFrom 2 credits per image
- FLUX.1 Krea Dev LoRA APIPhotographic FLUX.1 Krea with your own LoRAsFrom 4 credits per image
- FLUX.1 Dev ControlNet LoRA APIPose, depth or edge control on FLUX.1 with your LoRAsFrom 6 credits per image
- FLUX.1 Fill Dev LoRA APIMasked inpainting on FLUX.1 Fill with your own LoRAsFrom 7 credits per image
- FLUX.1 Dev LoRA APIClassic FLUX.1 Dev with up to three of your LoRAsFrom 3 credits per image
- FLUX.1 Schnell LoRA APIFast FLUX.1 Schnell that loads your own LoRAsFrom 1 credit per image
Other image APIs
- Qwen Image 2.1 LoRA APIQwen Image 2.1 images and edits with up to three of your LoRAsFrom 5 credits per image
- MiniMax H3 Image LoRA APIH3 stills and edits with up to three of your LoRAsFrom 7 credits per image
- Anima Turbo LoRA APIAnime art with your own style or character LoRAsFrom 3 credits per image
- Krea 2 Turbo LoRA APIKrea 2 Turbo images and restyles with your own LoRAsFrom 4 credits per image
- P-Image LoRA APIFast P-Image renders and edits with one LoRA of your ownFrom 1 credit per image
- Z-Image Base LoRA APIZ-Image Base with up to three of your own LoRAsFrom 3 credits per image
