jupyterlab_branding_extension

JupyterLab branding extension that replaces the default main area logo, the startup splash logo, and displays a configurable system name in the top toolbar. Supports SVG (inline embedding) and raster logo formats via configurable URIs.

Features

• Custom main area logo - replace the default JupyterLab 3-dot logo with any SVG or raster image
• Custom startup splash logo - replace the Jupyter logo at the centre of the boot splash animation, with the orbiting moons preserved
• System name in top toolbar - display a configurable text label (e.g. environment name) in the right side of the top toolbar, with optional custom hex color
• Configurable via traitlets - set logo_uri, splash_logo_uri, system_name, and header_system_name_color in jupyter_lab_config.py
• Local and remote logos - supports file:// paths, https:// URLs, and local filesystem paths
• Inline SVG embedding - SVG logos are embedded directly in the DOM, matching JupyterLab's native approach
• Server extension - serves local logo files through an authenticated HTTP endpoint, bypassing browser file:// restrictions

Requirements

• JupyterLab >= 4.0.0
• jupyter_server >= 2.0.0

Install

pip install jupyterlab_branding_extension

Configuration

Add to your jupyter_lab_config.py:

# Local file path
c.Branding.logo_uri = "/path/to/your/logo.svg"

# file:// URI
c.Branding.logo_uri = "file:///path/to/your/logo.svg"

# Remote URL
c.Branding.logo_uri = "https://example.com/logo.svg"

When no protocol is specified, the path is treated as a local filesystem path.

Splash logo

# Replace the Jupyter logo in the startup splash animation
c.Branding.splash_logo_uri = "/path/to/your/splash-logo.svg"

Accepts the same URI forms as logo_uri (local path, file://, or https://). The image is base64-encoded server-side and injected into PageConfig so the custom logo appears together with the orbiting moons on first paint - no network round-trip, no white flash. The orbits themselves are untouched. Leave splash_logo_uri empty to keep the default Jupyter splash.

System name

# Display "production" in the top-right of the header
c.Branding.system_name = "production"

# Optional: override text color with a hex value
c.Branding.header_system_name_color = "#ff8800"

The system name is rendered inside the existing JupyterLab header toolbar spacer (jp-Toolbar-spacer). When header_system_name_color is empty, the text uses the JupyterLab sidebar font color (--jp-ui-font-color2) and adapts to light/dark themes automatically. When set to a hex value, that color is applied as an inline style. Leave system_name empty to disable this feature.

System name appearance (Settings UI)

The colour and capitalization of the system name are controlled per-user through Settings → Settings Editor → Branding, which overrides the deployment-side header_system_name_color:

• Capitalize system name - off by default; when on, renders the name in uppercase via CSS text-transform
• System name colour mode - Auto uses the JupyterLab theme colour (--jp-ui-font-color2, matches the sidebar font); Custom uses the hex colour below
• Custom hex colour - the hex value (e.g. #ff8800) applied when colour mode is Custom; when left blank it falls back to the deployment-side header_system_name_color

Settings changes apply live without a reload. The system_name text itself remains set by the deployment config (c.Branding.system_name).

How It Works

The extension has two components:

• Server extension - exposes /jupyterlab-branding/config (returns the configured logo URL, splash logo URL, system name, and header color), /jupyterlab-branding/logo (serves the local main logo), and /jupyterlab-branding/splash-logo (serves the local splash logo). The splash file is also inlined into PageConfig as a base64 data URI so the custom splash logo paints with the first splash frame
• Frontend plugin - applies the splash logo at module load (before activation) so the very first splash animation uses the custom logo, fetches configuration during activation, replaces the #jp-MainLogo element, and injects the system name span into the top toolbar spacer. SVG logos are embedded inline, raster images use <img> tags

Favicon

This extension does not override the browser favicon. For JupyterHub deployments, favicon branding is typically configured at the JupyterHub level - refer to your JupyterHub configuration for how the hub overrides favicon for individual user servers.

Uninstall

pip uninstall jupyterlab_branding_extension