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Built-in Option
How to Enable DeepSeek's Own Dark Mode
DeepSeek includes a built-in dark mode. Here is how to turn it on — then see below for a more customizable alternative.
On desktop (chat.deepseek.com)
Open DeepSeek Chat
Go to chat.deepseek.com in your browser and sign in.
Open Settings
Click your profile avatar in the bottom-left corner, then open Settings.
Choose the Dark theme
Under Theme or Appearance, select Dark — the chat interface switches to dark colors.
On iPhone & Android
Open app settings
In the DeepSeek app, tap your profile icon, then open Settings.
Choose Dark
Select the dark theme option — or let it follow your device theme.
Limitation: DeepSeek's dark theme is a fixed palette with no custom colors or automatic day/night schedule. Turn Off the Lights lets you pick your own dark colors and automate switching on DeepSeek and every other site.
We verified these steps on chat.deepseek.com and the DeepSeek app on iPhone and Android in October 2026. Last updated: .
Side-by-Side
DeepSeek's Built-in Dark Mode vs Turn Off the Lights
Both options give you a dark DeepSeek — the difference is how much control you keep over it.
| Feature | DeepSeek Built-in | Turn Off the Lights |
|---|---|---|
| Dark theme on DeepSeek | ✅ Yes — via profile → Settings → Theme | ✅ Yes — via Night Mode |
| Custom colors | ❌ One fixed palette | ✅ Background, text, links and buttons — all adjustable |
| Automatic schedule | ❌ Manual toggle only | ✅ Sunrise/sunset or custom hours |
| Extra appearance options | ⚠️ Theme selection only | ✅ Per-element colors plus per-site rules |
| Works on other websites | ❌ DeepSeek only | ✅ Same dark theme on every site you visit |
| OLED true black | ⚠️ One fixed dark palette | ✅ Optional true black for OLED battery savings |
| Mobile | ✅ Theme option in the DeepSeek app | ⚠️ Desktop browsers, plus Safari on iOS and Samsung Internet on Android |
| Price | ✅ Free | ✅ Free & open source |
Extension Features
Everything You Need for the Best DeepSeek Dark Mode
Turn Off the Lights is not just a simple dark theme for DeepSeek. It is a complete browser enhancement built to give you full control over how every website looks in the dark.
Consistent DeepSeek Dark Theme
Apply a uniform dark theme to chat.deepseek.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 — DeepSeek, 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 DeepSeek has already applied its own dark mode and can skip double-layering automatically.
No DeepSeek Data Access
The extension applies visual changes only. It does not read, store, or transmit any DeepSeek content or account data.
How It Works
Enable DeepSeek 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 chat.deepseek.com
Navigate to chat.deepseek.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 DeepSeek switches without any manual effort.
Browser Support
One DeepSeek Dark Mode Extension. Every Browser.
Turn Off the Lights is available across all major desktop browsers. Install it in one browser and your Night Mode settings sync automatically to others.
⬇ Install Free — Night Mode for DeepSeek
FAQ
Frequently Asked Questions About DeepSeek Dark Mode
DeepSeek 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 — chat.deepseek.com offers a theme option under your profile avatar → Settings. For custom colors and an automatic schedule, use the free Turn Off the Lights extension.
DeepSeek'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 DeepSeek mobile app includes a theme option in its settings. 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 or update the app, then check profile → Settings → Theme. If dark mode is missing or too limited, the Turn Off the Lights extension applies a dark theme to DeepSeek in any desktop browser.
Why Turn Off the Lights
The Most Complete DeepSeek Dark Mode Solution Available
While DeepSeek does offer a built-in dark mode, many users searching for DeepSeek dark mode want more control — custom colors, automatic scheduling, and a consistent dark experience that extends beyond DeepSeek to every other website.
Custom Colors for DeepSeek's Dark Theme
DeepSeek's built-in dark mode uses a fixed dark 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 DeepSeek and all other sites.
Automatic Dark Mode Scheduling
DeepSeek'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 DeepSeek and every other site.
One Extension, Dark Mode Everywhere
DeepSeek is just one website. Turn Off the Lights applies the same Night Mode theme to every website you visit — DeepSeek, coding sites, documentation, GitHub, 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: