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Built-in Option
How to Enable Gemini's Own Dark Mode
Gemini includes a built-in dark mode. Here is how to turn it on — then see below for a more customizable alternative.
On desktop (gemini.google.com)
Open Gemini and sign in
Go to gemini.google.com in your browser and sign in with your Google account — the theme option only appears when signed in.
Open Settings & help
Click Settings & help at the bottom-left of the Gemini interface.
Turn on Dark theme
Toggle Dark theme on — the Gemini interface switches to dark colors instantly.
On iPhone & Android
Set your device to dark
On iPhone: Settings → Display & Brightness → Dark. On Android: Settings → Display → Dark theme.
Gemini follows the system
The Gemini mobile app matches your device theme automatically — no separate toggle needed.
Limitation: Gemini's dark theme is a single fixed palette with no scheduling or custom colors, and the web setting requires a signed-in Google account. Turn Off the Lights lets you pick your own dark colors and automate switching on Gemini and every other site.
Official instructions: Use Dark theme in Gemini Apps — Google Help.
We verified these steps on gemini.google.com and the Gemini app on iPhone and Android in October 2026. Last updated: .
Side-by-Side
Gemini Built-in Dark Mode vs Turn Off the Lights
Both options give you a dark Gemini — the difference is how much control you keep over it.
| Feature | Gemini Built-in | Turn Off the Lights |
|---|---|---|
| Dark theme on Gemini | ✅ Yes — via Settings & help | ✅ Yes — via Night Mode |
| Custom colors | ❌ Fixed dark-grey palette only | ✅ Background, text, links and buttons — all adjustable |
| Automatic schedule | ❌ Manual toggle only | ✅ Sunrise/sunset or custom hours |
| Sign-in required | ⚠️ Google account needed | ✅ None — works without an account |
| Works on other websites | ❌ Gemini only | ✅ Same dark theme on every site you visit |
| OLED true black | ⚠️ One fixed dark palette | ✅ Optional true black for OLED battery savings |
| Mobile apps | ✅ Follows device theme | ⚠️ Desktop browsers only |
| Price | ✅ Free | ✅ Free & open source |
Extension Features
Everything You Need for the Best Gemini Dark Mode
Turn Off the Lights is not just a simple dark theme for Gemini. It is a complete browser enhancement built to give you full control over how every website looks in the dark.
Consistent Gemini Dark Theme
Apply a uniform dark theme to gemini.google.com with your chosen colors — not just the fixed default theme.
Auto-Schedule Day/Night Switch
Set sunrise/sunset switching or custom hours. Your dark theme turns on and off automatically without any manual intervention.
One Theme for All Websites
The same dark theme applies to every website — Gemini, Instagram Web, Messenger, YouTube, Reddit, and beyond.
Choose Your Own Dark Colors
Pick background, text, link, button, and border colors independently. True black for OLED or warm dark for reading comfort.
Smart Detection
Turn Off the Lights detects when Gemini has already applied its own dark mode and can skip double-layering automatically.
No Gemini Data Access
The extension applies visual changes only. It does not read, store, or transmit any Gemini content or account data.
How It Works
Enable Gemini Dark Mode in Under 30 Seconds
Turn Off the Lights is available in every major browser store and takes less than 30 seconds to install. Switch Night Mode on once in Options — from then on it applies automatically.
Install Turn Off the Lights
Add the free extension from Chrome Web Store, Firefox Add-ons, Edge Add-ons, or Opera Add-ons.
Open gemini.google.com
Navigate to gemini.google.com in your browser with the extension installed.
Enable Night Mode
Open Options → Night Mode tab and toggle the Night Mode switch on.
Set Schedule & Colors
Choose custom dark colors and set an automatic day/night schedule so night mode on Gemini switches without any manual effort.
Browser Support
One Gemini Dark Mode Extension. Every Browser.
Turn Off the Lights is available across all major desktop browsers. Install it in each browser you use — your Night Mode settings stay in sync across your devices through your browser's built-in sync.
⬇ Install Free — Night Mode for Gemini
FAQ
Frequently Asked Questions About Gemini Dark Mode
Gemini has a built-in dark mode in its settings. For a fully customizable alternative with custom colors and auto-scheduling, install Turn Off the Lights and enable Night Mode in Options.
Yes — gemini.google.com offers a Dark theme toggle under Settings & help in the bottom-left corner. For custom colors and an automatic schedule, use the free Turn Off the Lights extension.
Gemini's dark mode has fixed colors and requires manual toggling. Turn Off the Lights offers custom colors, automatic scheduling, and the same dark theme on every other website you visit.
The Gemini mobile app follows your device's system theme, so set your phone to dark. Turn Off the Lights is a browser extension for desktop browsers — on mobile the built-in theme is the recommended option.
On OLED screens, true black pixels use less power. A true-black custom theme from Turn Off the Lights Night Mode saves more than any fixed dark-grey theme.
Reload the page, make sure you are signed in, then check Settings & help → Dark theme. If dark mode is missing or too limited, the Turn Off the Lights extension applies a dark theme to Gemini in any desktop browser.
Why Turn Off the Lights
The Most Complete Gemini Dark Mode Solution Available
While Gemini does offer a built-in dark mode, many users searching for Gemini dark mode want more control — custom colors, automatic scheduling, and a consistent dark experience that extends beyond Gemini to every other website.
Custom Colors for Gemini's Dark Theme
Gemini's built-in dark mode uses a fixed dark-grey palette. Turn Off the Lights lets you choose your own background color — pure black for OLED, warm dark for eye comfort, or any shade you prefer. Apply the same custom theme consistently across Gemini and all other sites.
Automatic Dark Mode Scheduling
Gemini's built-in dark mode requires manual toggling. Turn Off the Lights lets you set sunrise/sunset switching or custom hours, so your dark theme turns on and off automatically across Gemini and every other site.
One Extension, Dark Mode Everywhere
Gemini is just one website. Turn Off the Lights applies the same Night Mode theme to every website you visit — Gemini, Google Search, Gmail, Google Docs, and beyond — giving you a unified dark experience across your entire browser.
Open Source, Private, and Free — Always
Turn Off the Lights collects no personal data, displays no advertising, and charges nothing. The extension is fully open-source under the GNU General Public License Version 2 (GPLv2), with its complete source code available on GitHub for anyone to inspect. It has been in continuous development since 2009 and remains one of the most trusted browser extensions available, with millions of active users across all major browsers. Stefan Van Damme is the solo developer and has maintained the extension with monthly updates for over 15 years.
Dark Mode Guides
More Dark Mode Guides
Get the same dark experience on your other favorite websites and browsers: