Configuration

marimo offers two types of configuration: User Configuration and App Configuration. Both can be easily managed through the Settings menu in the marimo editor.

App Configuration

App Configuration is specific to each notebook and is stored in the notebook.py file. This allows you to customize various aspects of your notebook, including:

• Notebook width

• Notebook title

• Custom CSS

• Additional app-specific settings

• and more

User Configuration

User Configuration applies globally across all marimo notebooks and is stored in a .marimo.toml file. marimo searches for this file in the following order:

1. Current directory

2. Parent directories (moving up the tree)

3. Home directory (~/.marimo.toml)

If no .marimo.toml file is found, marimo creates a default one in your home directory.

While you can edit the .marimo.toml file directly, we recommend using the marimo UI for a more user-friendly experience. To view your current configuration and locate the config file, run:

marimo config show

You can customize:

• Runtime configuration

• Hotkeys

• Completion settings (auto-completion, AI copilot, etc.)

• Display settings (theme, font size, output placement, etc.)

• Autosave settings

• Package management preferences

• Server settings

• VIM keybindings

• Formatting settings

• AI settings

• and more

Environment Variables

There are some configuration options that can be set via environment variables. These are:

Environment Variable	Description	Default Value
MARIMO_OUTPUT_MAX_BYTES	Maximum size of output that marimo will display. Outputs larger than this will be truncated.	5,000,000 (5MB)
MARIMO_STD_STREAM_MAX_BYTES	Maximum size of standard stream (stdout/stderr) output that marimo will display. Outputs larger than this will be truncated.	1,000,000 (1MB)
MARIMO_SKIP_UPDATE_CHECK	If set to “1”, marimo will skip checking for updates when starting.	Not set
MARIMO_SQL_DEFAULT_LIMIT	Default limit for SQL query results. If not set, no limit is applied.	Not set