What is OmniConverter?

OmniConverter is a free online converter suite with professional-grade tools for unit conversion across 20+ categories, color design tools (palette generator, gradient maker, color picker), 200+ Google Fonts browser, image compression and conversion (17 tools), PDF tools, text utilities (case converter, word counter, diff checker), technology history timelines, and news coverage across 7 sections.

Is OmniConverter free to use?

Yes, all OmniConverter tools are completely free. No sign-up, no account, no subscription required. Just open and convert.

Does OmniConverter support multiple languages?

Yes, OmniConverter is available in 8 languages: English, Spanish, French, German, Chinese, Japanese, Hindi, and Arabic. Blog posts are in English only.

What unit conversions does OmniConverter support?

OmniConverter supports 20+ unit categories including length, weight, temperature, area, volume, speed, time, currency, digital storage, pressure, energy, power, force, frequency, angle, fuel consumption, shoe size, clothing size, ring size, and more. All conversions use exact factors with live currency rates.

What color tools does OmniColors offer?

OmniColors includes 9 free color tools: Color Palette Generator with 6 harmony modes, CSS Gradient Maker (linear/radial/conic), Color Picker & Converter (HEX/RGB/HSL/CMYK), Color Mixer & Blender, WCAG Contrast Checker, Color Names Database with 250+ named colors, Hex Color Clock, Color Converter, and Palette from Image extractor.

Is OmniColors free to use?

Yes, all OmniColors tools are completely free with no usage limits. No sign-up or account is required. Everything runs client-side in your browser.

Is my color data private?

Absolutely. All color processing happens locally in your browser. No color data, images, or palettes are ever sent to a server. Images uploaded for palette extraction are processed entirely client-side and never leave your device.

What color formats are supported?

OmniColors supports HEX, RGB, RGBA, HSL, HSLA, CMYK, and HSB color formats. The Color Palette Generator exports as HEX, CSS custom properties, or PNG image. The Gradient Maker generates production-ready CSS with vendor prefixes.

What is a WCAG contrast ratio?

WCAG (Web Content Accessibility Guidelines) defines minimum contrast ratios to ensure text is readable for people with visual impairments. Normal text requires 4.5:1 (AA) or 7:1 (AAA). Large text requires 3:1 (AA) or 4.5:1 (AAA). The OmniColors Contrast Checker tests your colors against all four levels.

Can I extract colors from an image?

Yes. The Palette from Image tool lets you upload JPG, PNG, or WebP images. It analyzes the image client-side and extracts the dominant color palette with HEX codes. You can copy the colors as CSS custom properties or export the palette as a PNG image.

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OmniColors, Free Online Color Tools for Designers & Developers

Professional-grade color tools for designers, developers, and artists. Generate harmonious palettes with 6 color theory modes, create CSS linear/radial/conic gradients, pick colors with HEX/RGB/HSL/CMYK values, mix pigments, verify WCAG 2.1 contrast ratios, extract palettes from images, and explore 250+ named colors, all free, fully client-side, no sign-up required.

Select a color tool below to get started

Color Palette Generator

CSS Gradient Maker

Color Picker & Converter

Color Mixer & Blender

WCAG Contrast Checker

Color Names Database, 250+ Named Colors with HEX, RGB, HSL

Hex Color Clock

Color Converter

Palette from Image

Interactive Harmony Visualizer

Select a harmony type to see how colors relate on the color wheel. Click a rule to see when to use it in UI design.

Ideal for CTA buttons, hero sections, and accent elements where maximum contrast and visual pop are needed.

Select harmony type...

HSL(210, 80%, 55%)

Semantic Color Guide for UI States

A clean mapping of colors to their standard UI states. Use these consistently across your design system for predictable user experiences.

State	Color	HEX	Usage
Success	Green	`#22C55E`	Form submissions, completed actions, positive confirmations, payment success
Error	Red	`#EF4444`	Validation errors, destructive actions, critical alerts, connection failures
Warning	Amber	`#F59E0B`	Pending states, caution messages, unsaved changes, rate limits approaching
Info	Blue	`#3B82F6`	Helpful tips, general notifications, links, secondary actions, informational badges
Disabled	Gray	`#9CA3AF`	Inactive buttons, unavailable options, read-only fields, loading states
Link	Indigo	`#6366F1`	Hyperlinks, navigation items, clickable text, interactive elements

Color Theory & Harmonies Explained

Understanding color harmonies helps designers create visually balanced, aesthetically pleasing interfaces. These harmony rules are derived from the color wheel and describe how colors relate to each other.

Color Psychology in Branding & UI

Colors evoke specific emotional responses and cultural associations. Choosing the right palette communicates your brand's personality before a user reads a single word.

Color	Emotional Association	Industry Use Cases
Blue	Trust, stability, professionalism	Finance, healthcare, SaaS, enterprise software. Used by Facebook, PayPal, IBM, LinkedIn.
Red	Urgency, passion, energy	Food delivery, entertainment, sales, warnings. Used by YouTube, Netflix, Coca-Cola.
Green	Growth, health, nature, success	Health, wellness, sustainability, fintech. Used by Spotify, Whole Foods, WhatsApp.
Purple	Luxury, creativity, wisdom	Premium products, creative tools, education. Used by Twitch, Cadbury, HubSpot.
Orange	Enthusiasm, warmth, affordability	Call-to-action buttons, e-commerce, travel. Used by Amazon, Fanta, Nickelodeon.
Yellow	Optimism, attention, caution	Warnings, highlights, cheerful brands. Used by McDonald's, IKEA, Snapchat.
Black	Sophistication, luxury, authority	High-end fashion, luxury goods, minimal design. Used by Chanel, Nike, Apple.
White	Purity, simplicity, cleanliness	Healthcare, minimal design, technology. Used by Apple, Tesla, Google.

Developer's Cheat Sheet to Color Formats

Choosing the right color format depends on your use case. Here is a practical comparison of the most common formats used in CSS and design systems.