Blue Light Filter & Screen Dimmer
Add a warm-tone overlay and extra dimming to your screen for evening use · free, no signup
See Blue Light Filter & Screen Dimmer in action
Free Blue Light Filter & Screen Dimmer
Most operating systems have a night-light setting, but it is easy to forget to turn on, and some laptops cannot dim their backlight as low as you would like in a dark room. This tool adds a warm-tinted, adjustable overlay directly on top of this page — a quick way to get a comfortable warm, dimmed screen without changing any system settings.
Drag the warmth slider toward orange for a stronger blue-light reduction, and the dimness slider to darken the screen further than your hardware brightness alone allows, using a semi-transparent black layer. Presets give a one-click Evening and Night setting, and everything resets the moment you leave the page.
Key features
Adjustable warmth
A smooth orange overlay from subtle to strong.
Extra dimming
Go darker than your screen's minimum hardware brightness.
Evening / Night presets
One-click comfortable settings.
No install
Works instantly on this page, no extension or app needed.
How to use it
- Open the tool in the evening or in a dark room.
- Adjust the warmth slider to taste.
- Adjust the dimness slider if the screen still feels too bright.
- Use a preset for a quick comfortable setting.
Worked example
Example
10pm reading → Night preset: warmth 70%, dimness 35% → a noticeably warmer, dimmer screen for late reading.
Who uses this tool
Night owls and shift workers
Reduce screen brightness and blue light late at night.
People sensitive to bright screens
Extra dimming below the hardware minimum.
Anyone without a built-in night mode
A quick browser-based alternative.
Tips for the best results
- Turn on your operating system's built-in night mode too for full-screen coverage outside the browser.
- Reduce blue light and brightness gradually in the evening rather than only right before bed.
- Combine with the 20-20-20 eye break timer for more complete eye comfort.
- This overlay only affects the browser tab, not other apps — use OS night mode for system-wide dimming.
Common mistakes to avoid
- Expecting it to dim other applications outside the browser.
- Setting the overlay so strong that text becomes hard to read.
- Relying on blue light filtering alone for sleep, while also using a bright phone right before bed.
Why use AZRS QuickFix?
It is 100% free, needs no signup and has no watermark or usage limits. The tool runs in your browser, so what you type stays on your device, and it works on phones, tablets and desktops. New tools are added every week — bookmark this page or browse the full QuickFix toolbox.
Frequently asked questions
Does this replace my operating system's night mode?
No, it only overlays this browser tab; use your OS night-light setting for system-wide dimming.
Can it make my screen darker than the lowest brightness setting?
Yes, the dimming overlay adds darkness on top of your hardware brightness, useful if the minimum is still too bright.
Does reducing blue light actually help sleep?
Evidence is mixed, but many people find warmer, dimmer screens more comfortable in the evening; it is one part of good sleep habits, not a guarantee.
Will this affect how colours look for design work?
Yes, it intentionally shifts colours warmer — turn it off before doing colour-accurate work.
Does it save my settings?
Your slider positions are kept for this browser tab while you're on the page.
Is this tool free?
Yes, completely free with no account needed.