Migrating CSS to OKLCH
A practical checklist for converting an existing stylesheet's colors to OKLCH without breaking anything.
Updated Jul 1, 2026 · By OKLCH.xyz editorial team
Migrating a stylesheet to OKLCH is mostly mechanical, but a few things are worth doing in the right order.
1. Convert the values
Paste your file into the bulk converter. It rewrites hex, rgb()
and hsl() values to oklch() while leaving variable names, comments, url()s and SVG
data untouched.
2. Add fallbacks where needed
If you support older browsers, keep an sRGB declaration before each oklch() one, or
wrap modern colors in @supports (color: oklch(0 0 0)).
3. Rebuild scales, don’t just translate
A one-to-one conversion preserves your current colors, but the real win is regenerating your ramps so they’re perceptually even. Feed each brand color into the palette generator and replace ad-hoc shades with a clean 50–950.
4. Re-check contrast
Perceptual lightness makes contrast easier to hit, but still verify text/background pairs in the contrast checker.
Calculation methodology
The bulk converter parses CSS declarations and values, preserving strings, comments, URLs and SVG data while replacing color tokens.