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Bethemesh
Images & graphics

Color blindness simulator

Upload an image and locally simulate protanopia, deuteranopia, tritanopia or achromatopsia.

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Customize the result, check the live preview, then copy the code.

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Responsive and automatically resized by Bethemesh.

  • 100% local
  • Instant
  • Free
  • No account
  • Works offline

Your files are processed locally in your browser and are never sent to our servers.

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Recommended size: up to 25 MB

Original

Simulation

Why use this tool?

Simulate several forms of color vision deficiency on an image directly in your browser to review color choices, contrast, and visual accessibility.

100% local and secure

Your data stays on your device and is never sent to our servers.

Smart processing

Prepare and transform images directly in your browser without additional software.

Supported formats

Common image formats with export options provided by the tool.

Save time

Get a clean, ready-to-use result in seconds without installing software or configuring a complex workflow.

Fonctionnement

How does this tool work?

The simulator loads your image locally and applies a color transformation matrix that approximates the selected type of color vision deficiency. You can switch between protanopia, deuteranopia, tritanopia, achromatopsia, and anomaly variants without uploading the file again. The original stays visible beside the simulation for immediate comparison, and the simulated result can be exported as a PNG without sending the image away from your device.

Use cases

Review an interface

Check whether a screen, dashboard, or product mockup remains understandable when some colors become difficult to distinguish.

Check a visual asset

Spot risky color combinations in charts, posters, infographics, presentations, or marketing graphics before publishing them.

Prepare an audit

Use the simulation as a fast visual check before carrying out a broader accessibility and contrast review.

Guide

How to use this tool

  1. 1

    Upload an image

    Choose a PNG, JPEG, or WebP file from your device.

  2. 2

    Choose a deficiency

    Select the type of color vision deficiency you want to simulate.

  3. 3

    Compare and export

    Compare the original with the simulation and download the result if useful.

Tips and best practices

  • Test several deficiencies instead of relying on a single simulation mode.
  • Use a contrast checker as well when text readability matters.
  • Add labels, shapes, or patterns when color alone communicates important information.

Frequently asked questions

Is the image uploaded to a server?

No. Loading, pixel transformation, and export all happen locally inside your browser.

Does this replace an accessibility audit?

No. It helps reveal color-related issues, but a complete audit should also review contrast, keyboard access, text, and structure.

Can I download the simulated image?

Yes. The simulated result can be exported as a PNG for review, sharing, or comparison with the original.

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