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bongobongo2020/krea2-character-lora-trainer

Analysis updated 2026-05-18

8PythonAudience · vibe coderComplexity · 3/5Setup · moderate

TLDR

Browser-based trainer for creating custom character LoRAs with the Krea 2 image model: upload photos, auto-caption, click train, download a .safetensors file.

Mindmap

mindmap
  root((krea2-lora-trainer))
    What it does
      Upload character photos
      Auto-caption with Qwen-VL
      Train LoRA on Krea 2 Turbo
      Download safetensors output
    Tech Stack
      Python
      FastAPI
      Vanilla HTML JS
      AI Toolkit
      Qwen-VL
    Use Cases
      Character LoRA for image generation
      Style training without command line
      Low-VRAM-aware fine-tuning
    Audience
      AI image creators
      Vibe coders
      ComfyUI users
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What do people build with it?

USE CASE 1

Train a LoRA on 10-20 photos of a character so you can generate new images of them in Krea 2 or ComfyUI.

USE CASE 2

Auto-caption a dataset of images using the built-in Qwen-VL model before training, without writing captions manually.

USE CASE 3

Run the full LoRA training pipeline on a 12 GB GPU with automatic settings tuning to avoid out-of-memory crashes.

What is it built with?

PythonFastAPIAI ToolkitQwen-VLmusubi-tuner

How does it compare?

bongobongo2020/krea2-character-lora-traineradam-s/car-diagnosisduration-ai/bonsai-image-android
Stars888
LanguagePythonPythonPython
Setup difficultymoderatemoderatehard
Complexity3/53/55/5
Audiencevibe coderresearcherresearcher

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 1h+

Requires a CUDA NVIDIA GPU (12 GB minimum), ~30 GB disk for model downloads, and Python 3.9+.

No license information stated in the README.

In plain English

This tool lets you train a custom AI image style (called a LoRA) for the Krea 2 image model, using a small collection of photos you upload. The entire process happens through a browser interface on your own computer, with no command line required. The typical workflow is: create a project, upload 10 to 20 photos of a character or subject, have the tool automatically write captions for them using a built-in AI, then click Start Training. When training finishes, you download a single file that you can load into tools like ComfyUI to generate new images in the style of your subject. The tool supports two training approaches. The default uses the Krea 2 Turbo model, which is publicly available and downloads automatically. Turbo produces results faster (8 steps per image) and is the recommended choice for most people. An optional second approach uses the raw Krea 2 base model, which you supply yourself, and is mainly useful for reproducing an older workflow. A practical concern for AI image training is running out of GPU memory. The tool detects your GPU's memory capacity and automatically adjusts training settings to fit within what you have. It also monitors ComfyUI (another AI image tool) if it is running on the same machine and temporarily frees memory from it before training starts, to avoid crashes. On Windows, installation is a double-click batch file that checks for required software, lets you pick where model files are stored, detects your hardware, and creates a desktop shortcut. On Linux and macOS, a single shell script starts the web app. The tool requires a CUDA-capable GPU (NVIDIA), around 12 GB of GPU memory is the practical minimum, and 24 GB is comfortable. Roughly 30 GB of disk space is needed for the base model download. The README is in English and covers both the quick start path and more advanced options like adjusting training steps, resolution, and caption settings.

Copy-paste prompts

Prompt 1
Walk me through setting up krea2-character-lora-trainer on Windows: install, upload photos of my character, auto-caption them, and start training a Turbo LoRA.
Prompt 2
I have a 12 GB GPU. What settings does krea2-character-lora-trainer auto-tune for me, and can I adjust the resolution or training steps manually?
Prompt 3
How do I load a .safetensors LoRA file produced by krea2-character-lora-trainer into ComfyUI and use it to generate images of my character?
Prompt 4
Explain the difference between the AI Toolkit Turbo engine and the musubi-tuner Raw engine in krea2-character-lora-trainer and when I should use each.

Frequently asked questions

What is krea2-character-lora-trainer?

Browser-based trainer for creating custom character LoRAs with the Krea 2 image model: upload photos, auto-caption, click train, download a .safetensors file.

What language is krea2-character-lora-trainer written in?

Mainly Python. The stack also includes Python, FastAPI, AI Toolkit.

What license does krea2-character-lora-trainer use?

No license information stated in the README.

How hard is krea2-character-lora-trainer to set up?

Setup difficulty is rated moderate, with roughly 1h+ to a first successful run.

Who is krea2-character-lora-trainer for?

Mainly vibe coder.

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