Free • Private • Nothing Sent

Free Color Converter & Contrast Checker

Convert HEX ↔ RGB ↔ HSL, pick colors, and check WCAG 2.1 contrast (AA / AAA) entirely in your browser. Share a pair with a hash link that never expires. Nothing is uploaded.

🔒 Runs in your browser · Never uploaded · Share uses URL # only · Works offline · Free, no sign-up

Foreground

HEX

RGB

HSL

Background

HEX

RGB

HSL

Hash link keeps both colors in the URL # — never sent to a server.

WCAG contrast

4.70:1

Normal textAA
Large textAAA

Preview

The quick brown fox jumps over the lazy dog.

A color tool that never uploads your palette

Colorly keeps every conversion and contrast check on your device. HEX, RGB and HSL stay in sync as you type or pick. WCAG grades use the official relative-luminance formula. Optional share links store only HEX values in the URL hash, so they never hit ToolBookly servers and never expire.

Features

HEX ↔ RGB ↔ HSL with live sync
Native color picker for foreground and background
WCAG 2.1 contrast ratio with AA / AAA for normal and large text
Shareable hash links — never uploaded, never expire

Why Colorly?

100% client-side: colors are never sent or stored
Built for accessibility checks next to everyday conversion
Hash share only — history stays local to the link you copy
Free, no sign-up, works offline after the page loads

How to convert a color

Pick a color

Use the picker or type HEX, RGB or HSL. All formats stay in sync.

Set a background

Choose a second color to check contrast for text or UI.

Read WCAG grades

See the ratio plus AA / AAA for normal and large text.

Share if you want

Copy a hash link with both HEX values — never uploaded, never expires.

Frequently Asked Questions

Are my colors uploaded or stored?

No. Colorly converts colors and checks WCAG contrast entirely in your browser. Nothing is sent to ToolBookly. Optional share links put HEX values only in the URL hash (#), which never reaches the server.

What color formats does Colorly support?

HEX (#RGB / #RRGGBB), RGB (0–255), and HSL (hue 0–360, saturation and lightness 0–100%). Changing any field updates the others instantly. A native color picker is included.

How does the WCAG contrast check work?

Colorly uses the WCAG 2.1 relative luminance formula. It reports the contrast ratio and whether the pair passes AA or AAA for normal text (4.5:1 / 7:1) and large text (3:1 / 4.5:1).

Can I share a color pair?

Yes. Use Copy share link. The link stores foreground and background HEX in the hash fragment only, so it works offline after load, never expires, and is not logged as a server query.

Is Colorly free?

Yes. Free, no sign-up, no limits. It is part of the ToolBookly suite of browser tools.

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