Black Screen Online — One-Tap Pure Black Display

✓ 無料ワンクリック黒画面、睡眠防止

Turn your screen pitch black instantly and prevent device sleep. No app needed — runs in any browser.

🖤 Instant Black Screen — Tap once to go pure black — no configuration needed.
🔒 Prevent Device Sleep — Uses Screen Wake Lock API to keep your screen on while black.
📱 Mobile & Desktop — Works great on phones, tablets, and computers with touch or click.
🖥️ Fullscreen Mode — Automatically enters fullscreen for a completely dark experience.

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