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Lumenfall

warning

This tutorial is a community contribution and is not supported by the Open WebUI team. It serves only as a demonstration on how to customize Open WebUI for your specific use case. Want to contribute? Check out the contributing tutorial.

Open WebUI also supports image generation through Lumenfall, an AI media gateway that unifies all popular image models on many different providers into an OpenAI-compatible API. Free models are available.

Initial Setup​

  1. Create a free account at lumenfall.ai.
  2. Generate an API key from your dashboard.

Configuring Image Generation​

  1. In Open WebUI, navigate to the Admin Panel > Settings > Images menu.
  2. Set the Image Generation Engine field to Open AI (Lumenfall uses the same syntax as OpenAI).
  3. Change the API endpoint URL to https://api.lumenfall.ai/openai/v1.
  4. Enter your Lumenfall API key.
  5. The API version can be left blank.
  6. Enter the model you wish to use. For example: gemini-3-pro-image, gpt-image-1.5, or flux.2-max. See all available models at lumenfall.ai/models.
  7. Set the image size (e.g. 1024x1024). Supported sizes depend on the model - if unsure, 1024x1024 works with most models.

Screenshot of the Open WebUI Images settings page configured with Lumenfall.

Configuring Image Editing​

Lumenfall also supports image editing through the same API:

  1. On the same Images settings page, scroll to the Edit Image section.
  2. Toggle Image Edit to on.
  3. Set the Image Edit Engine to Open AI.
  4. Enter the same API endpoint URL: https://api.lumenfall.ai/openai/v1.
  5. Enter your Lumenfall API key.
  6. Choose a model that supports editing (e.g. gpt-image-1.5).

For more details, see the Lumenfall documentation.