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straighten
rem ↔ px
Convert rem to px and back with a root-size slider. Also shows the em / percentage equivalents.
cssconvert
/ Root font-size
16px (browser default is 16)
/ pixels
px
/ rem
rem
em (same context)
1em
% of root
100%
pt (~)
12pt
/ Common sizes
Runs entirely in your browser. Nothing is sent anywhere.