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Hex Color Validator

Validators

Validate hex color codes for correct format and validity.

⚡ Instant🔒 Private, in your browser🆓 Free, no sign-up👥 For developers
Your data never leaves your browser. We do not store inputs.

What Hex Color Validator does

The Hex Color Validator checks whether a string is a properly formatted hex color code — the right '#' prefix, a valid digit count (3, 4, 6, or 8 hex digits), and only valid hex characters. Paste in a code you copied from a design tool or style guide and confirm it'll actually work before you use it in CSS.

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Reviewed by the FreeToolsVerse team · Last updated · How we check our tools

How to use Hex Color Validator

  1. Enter the hex code, with or without the # symbol
  2. The result appears instantly as you type
  3. See whether it's valid and which format it is (3-digit shorthand, 6-digit, or 8-digit with alpha)
  4. View the live color swatch if it's valid

Who should use it

Made for developers. Typical uses:

  • Checking a hex code copied from a design tool or brand guide before pasting it into CSS
  • Catching a typo like #12345Z that would otherwise fail silently in a browser
  • Confirming an 8-digit hex value with an alpha channel is correctly formatted before using it

Frequently asked questions

Is it free to use?
Yes, completely free.
Is my data sent anywhere?
No, validation happens entirely in your browser.
What hex formats are considered valid?
3-digit shorthand (#FFF), 6-digit (#FFFFFF), and 8-digit with an alpha channel (#FFFFFF80).
Does it show me a preview of the color?
Yes, a color swatch renders alongside the result when the code is valid.
What happens if I use an invalid hex code in CSS?
Browsers typically ignore the declaration or fall back to a default color, which can cause a silent styling bug that's easy to miss — validating first avoids that.

Learning resources

Explore more in Validators, read the guides and articles, or see how we test our tools.

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