Redesigning a website's color palette is one of the highest-impact visual changes you can make. It is also one of the most error-prone if handled casually. Colors touch every page, component, and state. Changing them without a plan means broken hover states, invisible text, and hours of bug hunting.
Step 1: Audit the Current State
Before choosing new colors, understand what exists. Paste your current site URL into PaletteRx to extract every color in use. Compare this against your documented palette (if one exists). The gap reveals how much color sprawl has accumulated.
Step 2: Build the New Palette
Create your new palette in PaletteRx from scratch or by modifying extracted colors. Run through all five steps: build, balance, WCAG compliance, role assignment, and export. The new palette should address any accessibility gaps the old one had.
Step 3: Create the Mapping
Map every old color to its new equivalent. Old primary blue maps to new primary blue. Old background gray maps to new light base. Document every mapping. PaletteRx's Live Preview can help by showing you how the old site looks with the new colors applied.
Step 4: Find-and-Replace with CSS Variables
If your old site uses CSS variables, the migration is straightforward: update the variable declarations and every reference updates automatically. If your site uses hardcoded hex values, you need to search and replace each one, which is why migrating to CSS variables during the redesign is worth the extra effort.
Step 5: Test Systematically
After applying the new palette, check every page template, every component state (hover, active, disabled, error, success), dark mode, and email templates. Browser DevTools' accessibility panel can highlight contrast failures across the page.