open-webui-docs/docs/features/audio/speech-to-text/env-variables.md

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2	Environment Variables

Environment Variables List

:::info

For a complete list of all Open WebUI environment variables, see the Environment Variable Configuration page.

:::

The following is a summary of the environment variables for speech to text (STT).

Environment Variables For Speech To Text (STT)

Variable	Description
WHISPER_MODEL	Sets the Whisper model to use for local Speech-to-Text
WHISPER_MODEL_DIR	Specifies the directory to store Whisper model files
WHISPER_LANGUAGE	Specifies the ISO 639-1 (ISO 639-2 for Hawaiian and Cantonese) Speech-to-Text language to use for Whisper (language is predicted unless set)
AUDIO_STT_ENGINE	Specifies the Speech-to-Text engine to use (empty for local Whisper, or openai)
AUDIO_STT_MODEL	Specifies the Speech-to-Text model for OpenAI-compatible endpoints
AUDIO_STT_OPENAI_API_BASE_URL	Sets the OpenAI-compatible base URL for Speech-to-Text
AUDIO_STT_OPENAI_API_KEY	Sets the OpenAI API key for Speech-to-Text