CSS Unit Converter

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CSS Unit Converter

Convert px, rem, em, vw and vh with configurable reference values.

Testing & Layout workspaceProcessing stays in your browser; regex runs in a time-limited worker.

Results assume the reference sizes above; em, rem and viewport units depend on context.

Privacy-focused processingBrowser processing is used wherever practical.
25-minute cleanup policyServer files, when required, are removed after completion—not during active work.
Text, pasted data or supported local filesMaximum size and exact support are shown inside the tool.

About This Tool

Convert between px, rem, em, vw and vh using editable font and viewport references.

How to Use

  1. Enter a value and choose a source unit.
  2. Set root/element font sizes and viewport dimensions.
  3. Review live CSS equivalents and copy the results.

Tool Features

  • px, rem, em, vw, vh
  • Editable reference sizes
  • Instant results
  • Copy/download report

Common Use Cases

Everyday work

Complete repetitive formatting or calculation tasks.

Publishing

Prepare clean output for websites and documents.

Local review

Inspect and verify your result before downloading.

Supported Input and Output

Text, pasted data or supported local files

  • Check the tool workspace for its exact file-size limit.
  • Browser format support can vary by device and browser version.
  • Always review the generated result before important use.

Frequently Asked Questions

Are em and rem always equal?

No. em uses the element font size; rem uses the root font size.

Security and Privacy Information

Local first

Supported processing runs inside your browser whenever practical.

Temporary files

When server processing is required, cleanup starts only after the work completes.

Your responsibility

Avoid uploading confidential data unless you understand the displayed processing notice.

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