How to Test Colors for Colorblindness
Simulate how your design looks to people with different types of color vision deficiency using our free tool.. This step-by-step guide walks you through the process using LevnTools Colorblind Simulator, a free browser-based tool that handles everything locally on your device. No software to install, no account to create, and no files uploaded to external servers. Follow these steps to complete the task in under a minute — updated for 2026.
Upload your design or enter colors
Upload an image of your design, or enter specific color values to test. The tool supports full-page screenshots, individual design components, or simple color swatches.
Select the type of color blindness
Choose from common types: Protanopia (red-blind), Deuteranopia (green-blind), Tritanopia (blue-blind), or Achromatopsia (total color blindness). Each simulation shows how affected individuals perceive your colors.
Compare original and simulated views
View your design side by side with the simulated version. Look for areas where important color distinctions are lost. Pay special attention to charts, status indicators, and any color-coded information.
Adjust your design
If critical information is lost in any simulation, adjust your colors or add non-color indicators (patterns, labels, icons) to ensure accessibility for all users.
Pro Tips
- About 8% of men and 0.5% of women have some form of color vision deficiency. Always design with this in mind.
- Never rely solely on color to convey information — add text labels, patterns, or icons as secondary cues.
- Red-green color blindness (Deuteranopia/Protanopia) is the most common. Test for these types first.
Common Issues & Fixes
Issue: My red and green buttons look the same in the simulation.
Fix: Use a blue-orange color scheme instead of red-green, or add text labels and icons to differentiate the buttons.
Issue: Charts with color-coded data are unreadable in the simulation.
Fix: Add patterns, labels, or different line styles alongside colors so data can be distinguished without relying on color alone.
Step-by-Step: How to Test Colors for Colorblindness
Complete this task using LevnTools Colorblind Simulator by following each step below. Every step runs in your browser with zero server interaction.
Step 1: Upload your design or enter colors
Upload an image of your design, or enter specific color values to test. The tool supports full-page screenshots, individual design components, or simple color swatches. Colorblind Simulator handles this step entirely in your browser, so your color files remain private throughout. After completing this step, proceed to the next one to continue processing.
Step 2: Select the type of color blindness
Choose from common types: Protanopia (red-blind), Deuteranopia (green-blind), Tritanopia (blue-blind), or Achromatopsia (total color blindness). Each simulation shows how affected individuals perceive your colors. Colorblind Simulator handles this step entirely in your browser, so your color files remain private throughout. After completing this step, proceed to the next one to continue processing.
Step 3: Compare original and simulated views
View your design side by side with the simulated version. Look for areas where important color distinctions are lost. Pay special attention to charts, status indicators, and any color-coded information. Colorblind Simulator handles this step entirely in your browser, so your color files remain private throughout. After completing this step, proceed to the next one to continue processing.
Step 4: Adjust your design
If critical information is lost in any simulation, adjust your colors or add non-color indicators (patterns, labels, icons) to ensure accessibility for all users. Colorblind Simulator handles this step entirely in your browser, so your color files remain private throughout. Once this step completes, your result is ready to download and use immediately.
Tips for Better Results with Colorblind Simulator
Getting the best output from Colorblind Simulator comes down to a few practical tips. About 8% of men and 0.5% of women have some form of color vision deficiency. Always design with this in mind.. Never rely solely on color to convey information — add text labels, patterns, or icons as secondary cues.. Red-green color blindness (Deuteranopia/Protanopia) is the most common. Test for these types first.. Following these recommendations ensures consistent, high-quality results every time you use Colorblind Simulator.
Common Issues and Fixes
If you run into problems while using Colorblind Simulator, these are the most common issues and their solutions. Issue: My red and green buttons look the same in the simulation.. Fix: Use a blue-orange color scheme instead of red-green, or add text labels and icons to differentiate the buttons.. Issue: Charts with color-coded data are unreadable in the simulation.. Fix: Add patterns, labels, or different line styles alongside colors so data can be distinguished without relying on color alone.. If none of these solutions resolve your problem, try clearing your browser cache and reloading Colorblind Simulator.
Frequently Asked Questions
Open LevnTools Colorblind Simulator in your browser and follow the 4-step process outlined in this guide. Start by upload your design or enter colors, then the entire process takes under a minute. No account or download is required.
LevnTools Colorblind Simulator is the best free option for this task because it runs entirely in your browser with no file uploads, no account requirements, and no usage limits. For users who value privacy and cost, it is the top choice in 2026.
Yes, LevnTools Colorblind Simulator works on mobile browsers including Chrome for Android, Safari for iOS, and Firefox Mobile. The interface adapts to smaller screens, and all processing happens locally on your device regardless of whether you use a phone, tablet, or desktop computer.
No, LevnTools Colorblind Simulator runs entirely in your web browser. There is nothing to install, no plugins required, and no desktop application to download. Open the tool page, follow the steps in this guide, and download your result. It works on any modern browser across all operating systems.
Yes, using LevnTools Colorblind Simulator to test colors for colorblindness is completely free. There are no premium features locked behind a paywall, no per-file charges, and no daily usage limits. The tool is and will remain free because all processing happens client-side, eliminating server costs.