Hex Color Validator
Use this free Hex Color Validator to quickly get accurate results in seconds, free and instantly offline with no signup required ever, trusted by professionals in Austin, Chicago, Miami, Denver, Seattle, and New York for reliable daily use without accounts, subscriptions, limits, or delays on any device for everyday personal and business workflows daily.
Validate a hex color code and convert it to RGB instantly in your browser. Free online hex color validator — check #RGB, #RGBA, #RRGGBB formats.
Calculator Inputs
About Hex Color
Use this free Hex Color Validator to quickly get accurate results in seconds, free and instantly offline with no signup required ever, trusted by professionals in Austin, Chicago, Miami, Denver, Seattle, and New York for reliable daily use without accounts, subscriptions, limits, or delays on any device for everyday personal and business workflows daily.
Four Formats Supported: 3-digit (#RGB), 4-digit (#RGBA), 6-digit (#RRGGBB), 8-digit (#RRGGBBAA). Shorthand (3/4) expands each nibble: #F3A → #FF33AA. Alpha channel (4/8) maps 00–FF to 0.0–1.0. The tool accepts with or without leading #.
Validation Logic: Strips #, checks length ∈ {3,4,6,8}, verifies all chars ∈ [0-9A-Fa-f]. On failure, returns exact reason (wrong length, invalid character). On success, outputs canonical 6/8-digit uppercase hex + rgb() or rgba() with decimal values (0–255) and alpha (0.0–1.0).
CSS Color Level 4: 4/8-digit forms are standard since 2018 (Chrome 62+, Firefox 52+, Safari 12.1+). Alpha in hex (#RRGGBBAA) is more compact than rgba() and works in all modern properties (color, background, border, etc.). The tool reports both formats.
Common Pitfalls: 5 or 7 digits (invalid), letters G–Z (invalid), missing # (accepted), mixed case (normalized). The tool catches all and explains the fix. No CSS parser quirks — pure hex math.
Instant, Private, Offline: Conversion is bitwise arithmetic in your browser. No network, no tracking, no storage. Safe for design systems, proprietary palettes, and air-gapped workflows.
Where it is used
A UI designer in Austin converting Figma specs to CSS; a frontend dev in Chrome debugging Tailwind color classes; a mobile dev in Miami porting hex to React Native; a game dev in Denver extracting palette from assets; a designer in Seattle checking contrast ratios; a creative director in New York reviewing brand guidelines.
How to use the Hex Color
- Hex color — enter the value (e.g. e.g. #FF5733 or FF5733).
- Calculate — press the Calculate button to see the result instantly above.
Examples
Shorthand with Alpha
Full 8-Digit
Invalid Length
Frequently Asked Questions
- Can I omit the leading #?
- Yes — the tool accepts both #FF5733 and FF5733. If you include the # it is stripped before validation.
- What do the 4 and 8 digit forms mean?
- They add an alpha (opacity) channel. #RGBA and #RRGGBBAA are CSS Color Level 4 formats (2018+). The tool expands them and reports rgba() with 0.0–1.0 alpha.
- Does it support named colors (red, blue)?
- No — hex only. Named colors and hsl()/rgb() strings are not parsed. Use a CSS parser for those.
- What about 5 or 7 digits?
- Invalid — no standard uses those lengths. The tool rejects them with a clear error message.
- Is my color value stored?
- Never. Conversion runs entirely in your browser. No network, no logs, no analytics. Works offline.