Live converter
Edit either side. The other side updates instantly.
Pixels
px
24 ÷ 16 = 1.5rem
Root em
rem
1.5 × 16 = 24px
Conversion workbench
Batch values, refactor CSS, generate fluid values, or build a modular scale.
Strings and comments are protected. CSS length tokens outside them are converted; query conditions can be excluded independently.
Live fluid preview
Viewport 768px
Fluid type that actually lands on your endpoints.
The scale is mathematical, not mandatory. Round or curate values to match optical rhythm and your product's density.
Production notes
Practical guidance, not blanket rules.
Accessibility-friendly directionrem-based type can honor user default font-size preferences better than a rigid root reset. Browser zoom still scales px, so px is not automatically an accessibility failure.
Design-system friendlyUse the batch and scale tools to migrate repeated values into tokens instead of performing isolated one-off conversions.
Refactor with intentA mechanical px→rem pass is not always correct. Check hairlines, media queries, SVG/canvas coordinates, image dimensions and third-party CSS before shipping.