RGBA to HEX Converter – Convert RGBA Online (Free Tool)

RGBA to HEX converts a colour with an alpha channel into the 8-digit HEX form (#RRGGBBAA) supported by every modern browser. Use it when your design tool spits out rgba() and your stylesheet uses HEX, or when you want a single token for a brand colour at multiple opacities.

• No registration, account, or installation required
• No API keys to manage and no rate limits to monitor
• 100% free with no hidden costs or daily limits
• Works with any color input format — HEX, RGB, RGBA, HSL, HSLA, named colors
• WCAG contrast checks calculated correctly for AA and AAA, both text and large text

1. Set R, G, B channels (0-255) and the Alpha channel (0-1, where 1 is fully opaque)
2. Read the 8-digit HEX result — last two digits are the alpha byte
3. Toggle a checkered background to see the transparency visually
4. Copy the HEX8 or fall back to rgba() if your target needs broader support

• Migrating an rgba()-heavy stylesheet to HEX tokens
• Generating a HEX8 design token for a colour family at multiple opacities
• Sanity-checking exported design tool values when implementing a UI

HEX8 not rendering correctly in an email client or older browser.

Some email clients and a few legacy environments don't accept the 8-digit form. Fall back to rgba() — the conversion is the same colour, just the longer notation.

Alpha shows as a strange byte value (e.g. 1A for "0.1").

Alpha is multiplied by 255 and rounded — 0.1 ≈ 0x1A (26/255). Use 0.1 as the rgba alpha and the byte will be correct; don't try to pass percentages directly.