Blackout icon Blackout before and after: a website in light mode, then the same page in dark mode

Dark mode. Any website. One extension.

Side by side: a website before Blackout in light mode, and after Blackout with the extension's toggle panel open showing brightness, contrast, sepia, and grayscale controls

Blackout forces a clean dark theme onto every site you visit — with per-site control, brightness/contrast tuning, and an optional day/night schedule. Free, private, no account required.

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What it does

Works everywhere One click darkens any site, even ones that never built their own dark mode.
Photos stay normal Smart color handling keeps images and video looking right — no "negative" effect.
Tune it to your eyes Brightness, contrast, warmth (sepia), and grayscale sliders, live-previewed.
Per-site overrides Dark everywhere except your bank's site? Set it once, it's remembered.
Auto day/night schedule Optional — dark mode switches on at night and off in the morning, automatically.
Nothing collected No analytics, no tracking, no network requests. Settings stay in your browser.

Available for

Chrome Edge Firefox Safari (coming soon)

Official store listings are in review. In the meantime, install the exact same build directly:

Install now (2 min, all browsers) →