Guides

Color conversion and contrast checking

Use HEX, RGB, HSL, and contrast ratios to keep interface colors readable.

Check the real foreground and background pair

Color conversion alone does not prove readability. Contrast must be checked against the actual background, state, font size, weight, and UI context where the color will appear.

Check normal text separately from large text.
Test hover, focus, disabled, and selected states.
Avoid judging transparent colors on a plain white background only.

Convert formats without losing intent

HEX, RGB, and HSL can represent the same color, but teams often prefer one format for tokens, CSS variables, or design handoff. Copy the format that matches the codebase convention and document alpha limitations.

Use HEX for compact static tokens.
Use RGB or HSL when components adjust channels.
Review alpha values against the final rendered background.

Use WCAG thresholds as review signals

AA and AAA thresholds help flag risky combinations, but they are not the entire accessibility review. Font size, text weight, icon meaning, motion, and focus visibility still need real interface checks.

AA normal text is stricter than AA large text.
AAA is useful for high-trust or long-reading surfaces.
Icons need labels or surrounding text when meaning is not obvious.

Avoid palette decisions from isolated swatches

A single color can look strong in a swatch but fail when used for dense text, charts, borders, and backgrounds. Review luminance gaps and contrast warnings before turning a converted value into a design token.

Check neutral text on tinted surfaces.
Check brand colors on both light and dark backgrounds.
Use border and fill colors that maintain workbench separation.

Continue into CSS utilities when needed

Color decisions often sit beside spacing, clamp values, and CSS cleanup. Use CSS Formatter, Unit Converter, and Clamp Generator after the color pair is readable so visual changes stay implementation-ready.

Format CSS before adding new color tokens.
Convert units for spacing around colored elements.
Use clamp only after fixed sizes are understood.

Before copying

A short review loop for safer reuse

1. Color ConverterConvert HEX, RGB, and HSL colors and inspect WCAG AA/AAA contrast diagnostics.ColorNext step: Convert color tokens between HEX, RGB, and HSLCheck the exact foreground and background pair used in the UI.2. CSS Unit ConverterConvert px, rem, em, and percent values for CSS layout calculations.CodeNext step: Convert spacing and typography values between common CSS units.Compare the output against the original input before copying.3. CSS Clamp GeneratorGenerate CSS clamp() expressions for responsive font sizes and spacing.CodeNext step: Generate fluid CSS values with min and max bounds.Compare the output against the original input before copying.

Color Converter

Convert HEX, RGB, and HSL colors and inspect WCAG AA/AAA contrast diagnostics.

Color

Use cases

Convert color tokens between HEX, RGB, and HSL
Check foreground and background contrast for AA and AAA thresholds
Copy a WCAG contrast report for design review or accessibility handoff
Review accessible button, form, and text color pairs before copying CSS

Common failure cases

A passing contrast ratio can still fail if the real UI uses smaller text or different weight.
Alpha, overlays, gradients, and background images can change the effective rendered contrast.
HEX, RGB, and HSL conversions can be copied into the wrong color syntax for the target CSS.

Before copying

Check the exact foreground and background pair used in the UI.
Verify AA normal text, AA large text, and AAA normal text separately.
Copy the color format that matches the target codebase convention.

Examples

Common input

Convert color formats, compare foreground/background pairs, and copy an accessibility report with AA/AAA checks.

#2563eb on #ffffff

Typical output

Use this as a quick sanity check before copying results.

HEX/RGB/HSL values / contrast 5.17 / AA pass / accessibility report

Button contrast

Checks a common primary button color against a light surface.

#2563eb on #ffffff

FAQ

Does Color Converter upload my input?

No. This tool runs in your browser unless the privacy badge explicitly says a server route is required.

Can I use this for production secrets?

Avoid pasting sensitive production data into any website. Prefer local test data or redacted payloads.

Why can a passing color still look weak?

Contrast depends on the real background, font size, font weight, alpha, and UI state, so review the actual component after converting values.

CSS Unit Converter

Convert px, rem, em, and percent values for CSS layout calculations.

Code

Use cases

Convert spacing and typography values between common CSS units.
CSS Unit Converter for code workflows

Common failure cases

CSS Unit Converter can still fail when the pasted input shape differs from 16px at 16px root.
The output should be reviewed in the target code workflow before reuse.
Browser-local processing does not make sensitive production data safe to paste.

Before copying

Compare the output against the original input before copying.
Remove secrets, customer data, and one-off environment values.
Continue with css-clamp-generator if the result needs another validation step.

Examples

Common input

Convert spacing and typography values between common CSS units.

16px at 16px root

Typical output

Use this as a quick sanity check before copying results.

1rem / 1em / 100%

FAQ

Does CSS Unit Converter upload my input?

No. This tool runs in your browser unless the privacy badge explicitly says a server route is required.

Can I use this for production secrets?

Avoid pasting sensitive production data into any website. Prefer local test data or redacted payloads.

CSS Clamp Generator

Generate CSS clamp() expressions for responsive font sizes and spacing.

Code

Use cases

Generate fluid CSS values with min and max bounds.
CSS Clamp Generator for code workflows

Common failure cases

CSS Clamp Generator can still fail when the pasted input shape differs from 16px at 360px, 32px at 1200px.
The output should be reviewed in the target code workflow before reuse.
Browser-local processing does not make sensitive production data safe to paste.

Before copying

Compare the output against the original input before copying.
Remove secrets, customer data, and one-off environment values.
Continue with css-unit-converter if the result needs another validation step.

Examples

Common input

Generate fluid CSS values with min and max bounds.

16px at 360px, 32px at 1200px

Typical output

Use this as a quick sanity check before copying results.

clamp(1rem, 0.5714rem + 1.9048vw, 2rem)

FAQ

Does CSS Clamp Generator upload my input?

No. This tool runs in your browser unless the privacy badge explicitly says a server route is required.

Can I use this for production secrets?

Avoid pasting sensitive production data into any website. Prefer local test data or redacted payloads.

Related tools

Open the utility connected to this guide.

Color ConverterConvert HEX, RGB, and HSL colors and inspect WCAG AA/AAA contrast diagnostics.Convert color tokens between HEX, RGB, and HSL · Check foreground and background contrast for AA and AAA thresholdsConvert color formats, compare foreground/background pairs, and copy an accessibility report with AA/AAA checks.No. This tool runs in your browser unless the privacy badge explicitly says a server route is required.CSS Unit ConverterConvert px, rem, em, and percent values for CSS layout calculations.Convert spacing and typography values between common CSS units. · CSS Unit Converter for code workflowsConvert spacing and typography values between common CSS units.No. This tool runs in your browser unless the privacy badge explicitly says a server route is required.CSS Clamp GeneratorGenerate CSS clamp() expressions for responsive font sizes and spacing.Generate fluid CSS values with min and max bounds. · CSS Clamp Generator for code workflowsGenerate fluid CSS values with min and max bounds.No. This tool runs in your browser unless the privacy badge explicitly says a server route is required.