Use PX to REM online for free. No installation, no signup — works directly in your browser.
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The conversion is mathematically precise based on the root font size you specify (default 16px). Every pixel value is divided by the root size to produce the exact rem equivalent. The tool handles individual values, full CSS declarations, and entire stylesheets, converting all px values while preserving non-px units.
All conversion runs entirely in your browser using simple client-side calculations. No CSS code or values are transmitted to any server. This is a straightforward mathematical conversion that requires no external processing, ensuring complete privacy of your stylesheet data.
Yes, use the swap button to convert rem values back to pixels. This bidirectional conversion is useful for teams working with both unit systems or for verifying that rem values produce the expected pixel sizes at your specified root font size.
