Is there a file size limit?

No practical limit for most operations.

Results are generated using standard algorithms for maximum accuracy.

fast

Pixel to Em Converter — fast

Convert pixel values to em/rem units for CSS.

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Convert pixel values to em/rem units for CSS.

Coming soon — full implementation in progress

Type, paste, or upload your content.

Result appears instantly in your browser.

Copy the result or download your file.

Calculate and scale aspect ratios for any resolution.

Generate linear and radial CSS gradients visually.

Generate CSS border-radius visually.