Which types of color blindness can it simulate?

The common types — including red-green variants (protanopia, deuteranopia) and less common ones like tritanopia — covering the main categories of color vision deficiency.

Is this a substitute for real accessibility testing?

It's a useful screening step for catching obvious color-contrast issues — comprehensive accessibility testing should also include tools like a WCAG contrast checker and, ideally, real user testing.

Does it work on any image, or just specific formats?

It works on standard image formats like JPG and PNG.

Does Color Blindness Simulator upload my files to a server?

No. Color Blindness Simulator runs entirely in your browser using on-device processing, your files never leave your device.

Color Blindness Simulator

Preview an image as seen with different types of color blindness.

Runs in your browser

Drop an image here

Choose File

About this tool

Designing with accessibility in mind means checking that your color choices remain distinguishable for users with color vision deficiencies, but you can't just "imagine" what that looks like accurately without actually simulating it. This tool previews an image as seen with different types of color blindness, letting you check your actual design or image for accessibility issues instead of guessing.

Frequently asked questions

Color Picker & Palette Generator

Pick colors, convert formats, and extract a palette from an image.

File Converter

Convert data files between CSV, JSON and TSV.

Hot

JSON Formatter

Format, validate and minify JSON.

Base64 Converter

Encode or decode text and files as Base64.

Base32 Encoder/Decoder

Encode or decode text as Base32.

ULID Generator

Generate sortable, timestamp-based ULIDs.

Semver Parser/Comparator

Parse and compare two semantic version numbers.

.env File Parser/Validator

Parse a .env file and flag duplicate keys, missing values and invalid names.

Markdown Table Generator

Build a Markdown table with a spreadsheet-style editor.

CSS Grid Generator

Visually build a CSS Grid layout and copy the code.

CSS Flexbox Generator

Visually build a CSS Flexbox layout and copy the code.

URL Encoder/Decoder

Encode or decode URLs and query strings.

PDF Tools

Merge, split, compress and convert PDF files.

Image Tools

Compress, resize, crop and convert images.

Link & QR Tools

Shorten links and generate QR codes and barcodes.

Audio Tools

Convert audio files and turn text into speech, or speech into text.

Video Tools

Compress and process video files, right in your browser.

SEO & Web Tools

Meta tags, sitemaps, schema markup and other on-page SEO utilities.

Data & Spreadsheet Tools

Clean, convert and inspect CSV, TSV and tabular data.

File Tools

Archive, inspect and convert files, right in your browser.

Business Tools

Invoices, quotations, receipts and other business documents.

Social Media Tools

Resize images for social platforms, count hashtags and preview posts.