Screen Tester
Open fullscreen solid colors or color temperature screens for display testing, lighting and cleaning.
The Screen Tester replaces the separate white, black, red and other color screen tools with one unified fullscreen display. Pick a solid color preset or custom hex value for monitor testing and lighting, or switch to color temperature mode to create warm or cool fill light for video calls. Every mode supports fullscreen and multiple monitors, and solid colors can be downloaded as PNG.
Mode
Color presets
Download
white_background_1920x1080.png
How to use
- Choose a color preset, enter a custom hex color, or switch to color temperature mode.
- Click the preview or the fullscreen button to cover the entire display.
- Set an output size and download a solid-color PNG, or open the screen on all connected monitors.
Frequently asked questions
Can I still open a white, black or red screen from the old links?
Yes, the old white-screen, black-screen, red-screen and other URLs redirect to this tool with that color preselected.
Does the color temperature mode work as a video call light?
Yes, it displays a warm or cool fullscreen fill light and remembers the last temperature in your browser.
Related tools
Mouse Polling Rate Checker
Measure your mouse polling rate in real time with average, maximum and minimum Hz.
JSON Formatter
Format, validate and minify JSON in one place.
XML Formatter
Pretty-print and indent XML documents.
YAML Formatter
Format YAML and convert between YAML and JSON in both directions.
CSV to JSON
Convert CSV tables into JSON data.
JWT
Encode, decode and verify JSON Web Tokens locally.