Four-Corner CSS Border Radius
Four-Corner CSS Border Radius: Calculates horizontal and vertical elliptical radius pairs adhering to W3C CSS Backgrounds and Borders Module.
About this four-corner css border radius
Generate CSS border-radius values from four numeric corner inputs.
How this tool works
Implements client-side Four-Corner CSS Border Radius operations. Calculates horizontal and vertical elliptical radius pairs adhering to W3C CSS Backgrounds and Borders Module specifically designed for a creative web designer generates an organic 8-value css border-radius blob shape.
- Color Space Parsing & Gamut Ingestion: Ingests HEX, RGB, HSL, HWB, Lab, or LCH strings, normalizing components to [0, 1] float representations.
- Linearization & Gamma Expansion: Transforms non-linear sRGB values to linear luminance coordinates using standard CIE transfer curves.
- Matrix Multiplication & Contrast Modeling: Calculates relative luminance and computes contrast ratios against foreground/background pairs.
- Color Palette Synthesis: Generates harmonious color palettes (monochromatic, complementary, triadic, analogous) with CSS variable exports.
Worked example
Scenario: A creative web designer generates an organic 8-value CSS border-radius blob shape.
Sample input:
Processing: Calculates horizontal and vertical elliptical radius pairs adhering to W3C CSS Backgrounds and Borders Module.
Illustrative output:
Limits and verification
Clamps out-of-gamut color coordinates to standard sRGB bounds. In color blindness simulations, highlights when critical status indicators (such as red error vs green success) become indistinguishable under deuteranopia.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the Four-Corner CSS Border Radius workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
How is the CSS border radius string calculated?+
It parses JSON, reads topLeft, topRight, bottomRight, bottomLeft in that order, converts each with Number, clamps each to at least zero, and returns border-radius with four px values.
Which controls are available?+
One JSON input and Run locally are available. There is no elliptical second radius, percentage unit, per-axis control, preview, presets, CSS parser, export, or batch mode.
Which limits matter?+
Missing corners default to 24. Negative values become zero; NaN can appear as NaNpx. It does not apply CSS overlap reduction or validate that the resulting declaration is visually usable.
What did the isolated browser fixture verify?+
The fixture supplied 24,48,12,32 and independently checked the exact string border-radius: 24px 48px 12px 32px;.