Can I convert multiple CSS values at once?

Yes, the batch converter lets you paste an entire CSS file and replace all unit values at once with your chosen target unit.

How does the rem calculation work?

Rem values are calculated relative to the root font size; the default is 16px, but you can adjust the base size to match your project’s stylesheet.

Are the conversions affected by screen size?

Viewport width and height (vw, vh) percentages change as the browser window resizes, while px, rem, em, pt, and % conversions are based on the entered value and base font size.

Is my CSS code sent to a server?

No, all processing happens in your browser; your code and uploaded files never leave your device.

HTML & CSS ToolsFree Tool

CSS Unit Converter

Provided byDevBoltdevbolt.dev

Converts between px, rem, em, pt, vw, vh, and % single values or batch CSS files.

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Screenshot of CSS Unit Converter on DevBolt — devbolt.devOpen the live tool →

About this tool

What CSS Unit Converter does

The CSS Unit Converter on DevBolt translates measurements between pixels, rems, ems, points, viewport widths, viewport heights, and percentages. Users can enter a single value, adjust the base font size for rem and em calculations, or upload an entire CSS file for batch conversion. The result displays the converted value alongside a quick-reference table of common conversions, all processed within the browser to keep code private.

Step by step

How to use the DevBolt CSS Unit Converter

1
Enter a numeric value in the input field
2
Select the source unit (px, rem, em, pt, vw, vh, or %) and the target unit
3
Adjust the base font size if converting to rem or em for accurate proportional scaling
4
View the converted result and use the reference table for common px-to-rem equivalents; for batch work, paste CSS into the converter and replace units at once

Is it right for you

Best for

Web developers and designers who need to standardize spacing, typography, or layout values across responsive projects, especially when ensuring consistent sizing across different devices and screen resolutions.

Limitations

No unit switching for viewport units (vw, vh) beyond the provided conversions
Batch conversion requires pasting CSS manually; no drag-and-drop file upload
Results depend on the user‑set base font size for rem/em calculations

Questions

CSS Unit Converter FAQ

Can I convert multiple CSS values at once?: Yes, the batch converter lets you paste an entire CSS file and replace all unit values at once with your chosen target unit.
How does the rem calculation work?: Rem values are calculated relative to the root font size; the default is 16px, but you can adjust the base size to match your project’s stylesheet.
Are the conversions affected by screen size?: Viewport width and height (vw, vh) percentages change as the browser window resizes, while px, rem, em, pt, and % conversions are based on the entered value and base font size.
Is my CSS code sent to a server?: No, all processing happens in your browser; your code and uploaded files never leave your device.

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