PX to REM, HEX to RGB & Color Converter Online Free

Front-end work is full of small conversions: pixels to rem for flexible text sizes, a HEX color from a design file into RGB, a brand color into HSL. PDFFlowState has three free tools for these, working in your browser with no sign-up.

PX to REM Converter

PX to REM Converter turns CSS pixels into REM using your root font size.

How it works: rem = px ÷ root font size. Browsers usually default the root font size to 16px, so:

Pixels REM (16px root)
12px 0.75rem
14px 0.875rem
16px 1rem
18px 1.125rem
24px 1.5rem
32px 2rem

Why use rem? Rem sizes scale with the user's font settings, which helps accessibility and makes responsive design easier. If your site sets a different root font size, enter it in the tool so the numbers match.

HEX to RGB

HEX to RGB turns color codes into RGB values.

A HEX code has three pairs of digits for red, green and blue. For example, #FF5733 is red 255, green 87, blue 51, written rgb(255, 87, 51).

Color Converter

Color Converter converts between HEX, RGB, HSL, CMYK and HSV.

  • HEX and RGB: the usual formats for screens and CSS.
  • HSL: hue, saturation and lightness, handy for making lighter or darker shades.
  • HSV: hue, saturation and value, common in color pickers.
  • CMYK: cyan, magenta, yellow and black, used for print.

Screens and printers show color differently, so a CMYK result is a close guide, not an exact match for print.

How to use the tools

  1. Open the tool on phone or desktop.
  2. Enter your value: pixels and root size, a HEX code, or a color in any supported format.
  3. Copy the result into your CSS or design tool.

Tips

  • Keep your root font size in mind. Changing it changes every rem value.
  • Check contrast between text and background colors so your design stays readable.
  • Shorten HEX codes like #FFFFFF to #FFF when the pairs repeat.
  • Related tools: Unit Converter for inches and centimeters, and Image Effects for adjusting pictures.

Frequently asked questions

Are these tools free? Yes. All three are free and need no sign-up.

How do I convert px to rem? Divide the pixel value by the root font size. With a 16px root, 24px is 1.5rem.

What is the default root font size? Browsers usually use 16px unless a site changes it.

Can I convert RGB to HEX? Use Color Converter, which converts between HEX, RGB, HSL, CMYK and HSV.

Convert your values now

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