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Viewport Size Calculator
Calculate responsive width, height, aspect ratio and viewport units.
Testing & Layout workspaceProcessing stays in your browser; regex runs in a time-limited worker.
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
Calculate responsive width/height values from a viewport size.
How to Use
- Set viewport width and height or use the current window.
- Enter a percentage or viewport-unit value.
- Review pixels, CSS values and aspect ratio.
Tool Features
- Editable viewport dimensions
- Current-window shortcut
- vw/vh and percentage results
- Copy/download report
Common Use Cases
Complete repetitive formatting or calculation tasks.
Prepare clean output for websites and documents.
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
Does this change my real browser viewport?
No. Calculations use the values you enter.
Security and Privacy Information
Supported processing runs inside your browser whenever practical.
When server processing is required, cleanup starts only after the work completes.
Avoid uploading confidential data unless you understand the displayed processing notice.