# Design tools

- Human page: https://happytails.ai/en/design-tools/
- Markdown: https://happytails.ai/en/design-tools.md
- Structured JSON: https://happytails.ai/agents/en/design-tools/index.json
- Visibility: public

## Page guide

Find the tool you need, then open it to get started.

## All design tools

- [Aspect ratio calculator](https://happytails.ai/en/design-tools/aspect-ratio-calculator/): Find the simplest aspect ratio from a width and height. ([Markdown](https://happytails.ai/en/design-tools/aspect-ratio-calculator.md))

- [Collage maker](https://happytails.ai/en/design-tools/collage-maker/): Arrange your images in a simple collage. ([Markdown](https://happytails.ai/en/design-tools/collage-maker.md))

- [Color palette from image](https://happytails.ai/en/design-tools/color-palette-from-image/): Extract representative colors with controllable palette size. ([Markdown](https://happytails.ai/en/design-tools/color-palette-from-image.md))

- [Color picker](https://happytails.ai/en/design-tools/color-picker/): Image upload sampling plus manual color entry. ([Markdown](https://happytails.ai/en/design-tools/color-picker.md))

- [Color shades](https://happytails.ai/en/design-tools/color-shades/): Generate tints/shades with defined color-space interpolation and HEX/CSS output. ([Markdown](https://happytails.ai/en/design-tools/color-shades.md))

- [Contrast checker](https://happytails.ai/en/design-tools/contrast-checker/): Compute stated WCAG ratio for foreground/background. ([Markdown](https://happytails.ai/en/design-tools/contrast-checker.md))

- [CSS box shadow](https://happytails.ai/en/design-tools/css-box-shadow/): Visual controls and accessible code output. ([Markdown](https://happytails.ai/en/design-tools/css-box-shadow.md))

- [CSS flexbox](https://happytails.ai/en/design-tools/css-flexbox/): Responsive interactive preview with generated CSS and minimal HTML. ([Markdown](https://happytails.ai/en/design-tools/css-flexbox.md))

- [CSS grid](https://happytails.ai/en/design-tools/css-grid/): Rows, columns, gaps and placements. ([Markdown](https://happytails.ai/en/design-tools/css-grid.md))

- [Curved text generator](https://happytails.ai/en/design-tools/curved-text-generator/): Place text on adjustable arcs or circles with radius, direction and spacing controls. ([Markdown](https://happytails.ai/en/design-tools/curved-text-generator.md))

- [Favicon generator](https://happytails.ai/en/design-tools/favicon-generator/): Create an ICO favicon from an image. ([Markdown](https://happytails.ai/en/design-tools/favicon-generator.md))

- [Gradient generator](https://happytails.ai/en/design-tools/gradient-generator/): Linear/radial stops, angle and CSS export. ([Markdown](https://happytails.ai/en/design-tools/gradient-generator.md))

- [Hex to RGB](https://happytails.ai/en/design-tools/hex-to-rgb/): 3/6/8-digit HEX support and explicit alpha interpretation. ([Markdown](https://happytails.ai/en/design-tools/hex-to-rgb.md))

- [Palette generator](https://happytails.ai/en/design-tools/palette-generator/): Generate from image or seed. ([Markdown](https://happytails.ai/en/design-tools/palette-generator.md))

- [Palette visualizer](https://happytails.ai/en/design-tools/palette-visualizer/): Preview selected colors on realistic text/surface components without claiming complete accessibility. ([Markdown](https://happytails.ai/en/design-tools/palette-visualizer.md))

- [RGB to hex](https://happytails.ai/en/design-tools/rgb-to-hex/): Validate channel ranges and alpha. ([Markdown](https://happytails.ai/en/design-tools/rgb-to-hex.md))

- [SVG optimizer](https://happytails.ai/en/design-tools/svg-optimizer/): Before/after render and size. ([Markdown](https://happytails.ai/en/design-tools/svg-optimizer.md))

- [Word art generator](https://happytails.ai/en/design-tools/word-art-generator/): Create styled or stacked display text with font, fill, outline, spacing and layout controls. ([Markdown](https://happytails.ai/en/design-tools/word-art-generator.md))

## Make design values consistent across formats

Design utilities help translate colors, dimensions and layout values into reusable settings. A color representation or size calculation is only useful when its units and intended display context are clear.

## How to choose your next step

Check the target medium, background and dimensions before copying a result. Test the design where it will actually appear.

## Common questions about design tools

### Are colors identical on every display?

No. Display calibration, color management and viewing conditions can change appearance. Numeric color conversion does not control those conditions.

### Does a computed contrast ratio describe the whole design?

A ratio compares specified foreground and background colors. Transparency, images, font size and other visual choices can change the actual reading experience.