Choose a Colour
Select one of seven presets or use the colour picker and hex field for a custom value. The preview updates before you open the large display.
Full-Screen Colour Display
White Screen Image Tool
Display white, black, red, green, blue, yellow, teal, or a custom colour across the browser window. Use it as a simple visual screen check, temporary light source, colour reference, clock display, or distraction-free solid-colour background.
7
Preset Colours
Custom
Hex Colour
4
Timer Options
Clock
Optional Overlay
White Screen and Full-Colour Display
Choose a colour and display intensity, select any optional features, then open the colour display. Use Escape, the exit button, or tap the display to close it.
Screen Colour
100%
This changes the rendered colour only. Use your device controls to
change the physical screen brightness.
Advanced Options
Clock Overlay
Keep Screen On
Preview
Fullscreen availability and Wake Lock behavior depend on the browser, device, page visibility, permissions, and operating-system settings.
Three Steps
How to Use the White Screen Tool
Select a colour, configure the optional controls, and open the full-window display.
Configure Optional Features
Adjust the rendered colour intensity, choose an auto-exit timer, enable the clock, select a colour cycle, or request a screen Wake Lock where the browser supports it.
Open the Colour Display
Choose Open Colour Display. The browser will request fullscreen where supported and otherwise retain the page-based overlay. Use Escape, the exit button, or tap the display to close it.
Which Colour Might Be Useful?
Colour
Possible Use
Important Note
White
Revealing dust before cleaning or providing temporary fill light
Turn off and unplug a monitor before physically cleaning it
Black
Checking for bright or stuck-looking pixels and reducing visual
distraction
Display-power effects vary between OLED and LCD hardware
Red, Green and Blue
Basic visual inspection of pixel and colour behavior
This is not professional calibration or a definitive diagnosis
Custom Colour
Visual references, ambient backgrounds, or brand-colour previews
Screen rendering varies by panel, profile, and device settings
Lighting tip: A phone, tablet, or monitor can provide a small temporary light source, but the result depends on screen size, distance, room light, colour accuracy, and device brightness. Check the photograph rather than relying on a fixed percentage.
Features
White, Black and Custom Colour Display Controls
Use preset colours or a custom hex value with optional timer, clock, colour-cycle, and Wake Lock controls.
White Display
Fill the display with white for a visual dust check, a neutral background, or a temporary source of reflected light.
Black Display
Use a dark screen for low-distraction viewing or a basic visual check for unusually bright pixels.
Seven Preset Colours
Switch between white, black, red, green, blue, yellow, and teal using accessible preset buttons.
Custom Hex Colour
Choose a colour visually or enter a valid six-digit hex value for a more specific reference.
Rendered Colour Intensity
Darken the displayed colour from 100% to 10%. This control does not change the device's physical backlight or hardware brightness.
Fullscreen Request with Fallback
The tool requests the browser's fullscreen mode where available and retains a page overlay when fullscreen cannot be entered.
Auto-Exit Timer
Close the colour display after one, five, ten, or thirty minutes, with a visible countdown.
Clock Overlay
Show the current local time over the selected colour while the display remains open.
Optional Screen Wake Lock
Request that a supported browser keep the screen awake. The system can still release or deny the lock, and the code tries to reacquire it when the page becomes visible again.
Optional Display Features
Countdown and Auto-Exit
The timer starts when the display opens and closes the overlay when it reaches zero. The selected settings remain available when you return to the page.
Preset Colour Cycle
Cycle through a sequence of colours at one of three speeds. The tool disables this motion automatically when the browser reports a reduced-motion preference.
Local Clock
Display the device's local time while the overlay is active. The clock is visual only and uses the device's current time settings.
Wake Lock Handling
A Wake Lock request may require a secure, visible page and browser support. It can be released automatically by the browser or operating system.
Common Uses
Locate Dust and Smudges
A white display can make marks easier to see. After locating them, turn off and unplug the monitor before cleaning it according to the manufacturer's instructions.
Temporary Photography Fill
Use a nearby screen as a small coloured or white light source. Avoid overheating the device, and inspect the exposure and colour in the camera preview.
Basic Pixel Inspection
View red, green, blue, white, and black screens to look for pixels that behave differently. Confirm suspected hardware defects with the manufacturer or a qualified technician.
Dark OLED Display
Black pixels can use less display power on OLED or AMOLED hardware than bright pixels. The effect depends on the panel, brightness, content, and device, and does not apply in the same way to LCD backlights.
Visual Colour Reference
Display a custom colour for rough visual comparison. This is not a colour-calibration instrument, and different displays can render the same hex value differently.
Large Clock Display
Add the optional clock to a solid-colour background for a simple temporary desk, studio, or room display.
Guide
White Screen vs Black Screen
The most suitable display depends on whether you need a bright visual reference, a dark background, or a basic screen inspection.
When a White Screen Can Help
- Finding screen marks: White can reveal dust and fingerprints before the monitor is powered down for cleaning.
- Temporary fill light: A nearby display can soften some shadows in a close-range photo or video-call setup.
- Neutral background: White can provide a simple temporary background behind a small object or translucent material.
- Visual inspection: Bright screens can make dark-looking pixel irregularities easier to notice.
When a Black Screen Can Help
- Low-distraction display: Black reduces visible page content and can suit dark-room use.
- Bright-pixel inspection: A dark background can make unusually bright or stuck-looking pixels easier to notice.
- OLED power behavior: Dark pixels can use less panel power on OLED hardware, although whole-device battery savings vary.
- Night environments: A black or dim red display may be less disruptive than a bright white screen.
How to Perform a Basic Visual Pixel Check
- Clean only after turning off and unplugging the display, then restart it for the visual check.
- Open red, green, blue, white, and black screens one at a time.
- View the panel from a normal angle and look across the full area without pressing or rubbing the screen.
- Repeat the check after restarting the display and testing another cable or source when relevant.
- Photograph a suspected physical panel defect with another camera. A normal software screenshot generally cannot capture a defect in the display hardware itself.
- Check the manufacturer's current pixel policy before requesting service or replacement.
This visual check cannot establish the cause of a screen problem. Flickering, lines, colour shifts, and persistent pixel issues can involve the panel, cable, graphics hardware, software, or settings.
Safer Monitor-Cleaning Workflow
- Use the white display only to locate marks before cleaning.
- Close the tool, power off the screen, and unplug it where the manufacturer recommends doing so.
- Let the panel cool before touching it.
- Use a clean, dry microfiber cloth with light pressure.
- Follow the manufacturer's guidance for any approved cleaning liquid. Do not spray liquid directly onto the panel.
- Allow the screen to dry before reconnecting power.
Using a Screen as a Small Photography Light
A phone, tablet, laptop, or monitor can provide a limited amount of light for close subjects. Choose white or a custom colour, position the device securely, and adjust the device's real brightness using its operating-system controls.
Keep enough distance to avoid reflections, colour casts, harsh highlights, or heat buildup. Review the camera histogram or preview and reposition the display rather than relying on one fixed percentage.
After shooting, use the Image Cropper to adjust framing or the Image Compressor when a smaller file is required.
Related Tools
Continue Your Image Workflow
Crop, compress, enlarge, rotate, combine, convert, or outline an image with another relevant tool.
Image Stretcher
Change image width and height when a layout requires different proportions.
Open Tool →Image Compressor
Reduce file size for websites, forms, email, and sharing.
Open Tool →Image Upscaler
Increase dimensions and use the available image-enhancement controls.
Open Tool →Image Cropper
Remove unwanted areas or prepare a selected aspect ratio.
Open Tool →Image Rotation Tool
Correct orientation, flip an image, or apply a custom angle.
Open Tool →Image Combiner
Merge two to four images horizontally, vertically, or in a grid.
Open Tool →Black and White Converter
Create a grayscale or monochrome version of a colour image.
Open Tool →Add Outline to Image
Add a solid, soft, or glow border around a supported image.
Open Tool →
FAQ
Frequently Asked Questions
Answers about fullscreen mode, Wake Lock, OLED displays, colour intensity, timers, and custom colours.
The tool is currently available without payment or account registration. Browser, device, permission, and operating-system limits can affect fullscreen and Wake Lock features.
Fullscreen support and user-interface behavior vary by browser, device, embedding context, and permission policy. The revised tool retains a page overlay when a fullscreen request is not available or is rejected.
Choose a duration before opening the display. The countdown starts immediately, updates once per second, and closes the colour overlay when it reaches zero.
Black pixels can use less panel power on OLED and AMOLED displays because those pixels emit little or no light. Actual whole-device savings depend on brightness, panel design, other screen content, radios, processor use, and system behavior. LCD displays use a backlight and behave differently.
It changes the display through a preset colour sequence at the selected interval. It is a visual convenience rather than a professional calibration process. The cycle is disabled when the browser reports a reduced-motion preference.
Screen Wake Lock lets a supported browser request that the device keep its display awake. The request can be denied or released by the browser or operating system, particularly when the page is no longer visible.
Press Escape on a keyboard, activate the exit button, or tap the colour display. If the browser entered native fullscreen, the tool also cleans up its timers and Wake Lock when fullscreen is exited through browser controls.
Yes. Use the colour picker or enter a valid six-digit hex value, such as #FFFFFF or #1A73E8. The preview updates after a valid value is entered.
No. It darkens the rendered colour inside the web page. Adjust the physical screen brightness separately through the device or operating-system controls.
Ready to Open a Colour Display?
Return to the tool, select a colour and optional settings, then open the full-window display.
Open the White Screen Tool