CSS Unit Converter

px、rem、em、%、pt、vw互转。
PX
16px
.
REM
1rem
.
EM
1em
.
%
100%
.
PT
12pt
.
VW
0.8333vw
.

6 Units

px, rem, em, %, pt, vw.

Custom Base

Set base font size and viewport width.

Copy Result

One-click copy to clipboard.

Client-side

All processing in your browser. No data uploaded.

关于CSS Unit Converter

CSS Unit Converter helps front-end developers and designers translate measurements between the six most common CSS length units: px (pixels), rem (root em), em (local em), % (percent), pt (points), and vw (viewport width). Getting unit conversions right is critical for responsive layouts — a spacing value that looks perfect at a 1440px viewport can break completely at 375px if the units are not chosen carefully. rem and em are preferred for typography because they scale with the user's browser font size preference, improving accessibility; vw adapts to viewport width for fluid layouts; and px remains useful for borders and fine details that should not scale. Enter any value, pick its unit, and see all six equivalents computed simultaneously. You can also customise the base font size (default 16px) and viewport width for accurate context-specific conversions.

如何使用CSS Unit Converter

  1. Type the numeric value you want to convert into the left input field.
  2. Select the source unit from the dropdown (px, rem, em, %, pt, or vw).
  3. If needed, update the "Base font" field — this affects rem, em, and % calculations. The default is 16px.
  4. If needed, update the "Viewport" field — this affects vw calculations. The default is 1920px.
  5. All six unit equivalents update instantly in the grid below.
  6. Click any result card to copy that value (with its unit suffix) to the clipboard.

常见问题

What is the difference between rem and em?

rem (root em) is always relative to the root element's font size (typically 16px). em is relative to the font size of the element itself, which can cascade and compound in nested elements.

Why does % conversion depend on the base font size?

In the context of font sizes, percentage values are relative to the parent element's font size. This tool uses the base font size as a stand-in for the parent, giving a useful approximation.

How many pixels is 1 point (pt)?

1pt = 96/72 ≈ 1.333px at standard screen resolution. Points are a print measurement unit and rarely used in modern CSS.

What viewport width should I enter?

Use the target device width for your design. Common values: 375px (iPhone SE), 768px (tablet), 1440px (desktop), 1920px (wide desktop).

Can I convert multiple values at once?

Currently the tool converts one value at a time. For batch conversions, use your browser's DevTools console with a custom script.

CSS Unit Converter 完全使用指南与免费在线工具

无需安装、完全免费、纯前端本地运行的高效 CSS Unit Converter 工具

用于快速解决：px、rem、em、%、pt、vw互转。。无需安装复杂软件，打开网页即可立即使用，极速且安全。

为什么选择 Metoolzy 的 CSS Unit Converter？

  • 秒级即时响应: 极致性能优化，输入即可见结果。
  • 数据绝对安全: 纯浏览器本地计算，数据绝不上传服务器。
  • 完全免费使用: 无需注册登录，无任何隐形消费。

三步快速上手

  1. 打开 Metoolzy CSS Unit Converter 工具页面。
  2. 在输入区粘贴或上传您的数据。
  3. 即时查看处理结果并点击复制或下载。

功能对比表

对比项 Metoolzy CSS Unit Converter 普通在线工具 本地客户端软件
使用成本 永久免费 有次数限制或收费 需购买授权
隐私保护 纯本地内存运行 数据需上传云端 本地运行

适用人群与应用场景

  • 软件开发人员日常调试与数据转换
  • UI/UX 设计师资产处理
  • 运营与办公人员效率提升

常见问题解答 (FAQ)

处理的数据会被记录或保存吗？

绝不会。所有运算均在您的浏览器本地完成，没有任何数据回传。