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CSS Variable Theme Previewer

Import CSS custom properties to preview light and dark themes, tweak values live, and export polished token sets.

How to use this tool

  1. Switch between theme presets or duplicate an existing theme as a starting point.
  2. Edit CSS variable values and verify changes in the live UI preview.
  3. Import JSON/CSV theme data or export your current set as formatted JSON.

Token workflow

  • Use the tokens pane to manage variable names and update values in place.
  • Preview panels apply the active variable set for quick visual validation.
  • Color swatches auto-detect common color token formats for faster scanning.

Data formats

  • JSON imports support either `{ name, variables }[]` or object-map shapes.
  • CSV expects `theme,variable,value` rows with one token per line.
  • Exported JSON is prettified and ready for source control.

FAQ

Can I compare multiple themes in one session?
Yes. Add, duplicate, switch, and remove theme presets without leaving the page.
What import formats are supported?
JSON and CSV are both supported, including array and object-map JSON shapes.
Does this generate CSS output files?
The tool exports structured JSON theme data; CSS output can be derived from those tokens in your build setup.

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