Text-Converters

CSS Unit Converter

Convert between CSS units like pixels (px), rem, em, and points (pt). Adjust the base font size for accurate rem and em conversions.

Converter
About the CSS Unit Converter

The CSS Unit Converter is an essential tool for web developers and designers. It provides a simple, real-time way to switch between different CSS length units, such as pixels (px), rems, ems, and points (pt). Understanding and converting between these units is crucial for creating responsive, accessible, and typographically consistent websites. This tool simplifies the math and helps you visualize the relationships between absolute and relative units, all securely within your browser.

  1. Set Base Font Size: For accurate `rem` and `em` conversions, first set the base font size of your project (most browsers default to 16px).
  2. Enter a Value: Type a value into any of the unit fields (px, rem, em, or pt).
  3. See Live Results: All other fields will update instantly to show the equivalent value based on your input.
  4. Reset: Click the 'Reset to Defaults' button to return the tool to its initial state (16px base size).

What are relative vs. absolute units?

Absolute units like pixels (`px`) and points (`pt`) are fixed and do not change based on other elements. Relative units like `rem` and `em` scale in relation to another value, which makes them excellent for creating responsive and accessible designs.

What is the difference between `rem` and `em`?

`rem` (root em) is relative to the font-size of the root `<html>` element. `em` is relative to the font-size of its *direct parent* element. `rem` is generally easier to manage for overall layout consistency, while `em` is useful for components that need to scale internally.

When should I use points (pt)?

Points are a traditional print unit. They are rarely used for screen design because they don't map cleanly to pixels across different screen resolutions. It's almost always better to use `px` or `rem` for web development.

Is my data secure?

Yes. All calculations happen in your browser. Nothing is sent to our servers, ensuring your data remains private.

Related Tools
Base64 Encode & Decode
Easily encode or decode text and files into Base64 format.
URL & HTML Encoder / Decoder / Slugify
A versatile tool to encode/decode text for URLs and HTML, or to create clean, URL-friendly slugs from any string.
Markdown to HTML Converter
Write in Markdown and see the live HTML preview side-by-side.
Meta Tag Generator
Create Open Graph and Twitter Card meta tags for your pages.