Free Developer Tools — Color, Favicons, URLs & Design Assets
Developer Tools on Apex Toolz bridge design and implementation — color pickers, palette extractors, gradient builders, theme token exporters, favicon generators, and URL encode/decode utilities that run instantly in the browser without Figma plugins or CLI installs.
About this category
Color workflows sample hues from photos, build balanced palettes, check WCAG contrast, and export CSS custom properties for Tailwind or design-system repos. Asset tools generate favicon packages, Open Graph images, and manifest snippets for production deploys.
URL utilities percent-encode query values, decode analytics payloads, and parse URLs into structured components for debugging OAuth redirects and webhook configs.
These tools complement Color Tools (a focused color hub) and Development Tools (CSS generators in a separate category on Explore). Start here when you need palettes, brand assets, or URL helpers in one place.
Featured tools below highlight the most common handoff tasks from design review to production CSS.
Design systems drift when tokens live only in Figma comments. Exporting CSS variables and JSON tokens from generators gives engineering a single paste target that matches what designers approved in review.
Micro-interactions and marketing landers often need one-off gradients and OG images — Developer Tools shorten the path from brand hex to deployable assets without opening heavyweight creative apps.
Component libraries in React, Vue, and Svelte consume the same CSS variables — exporting once from Theme Builder reduces drift between Storybook stories and production bundles when designers tweak primary hue mid-sprint.
Why use these tools
Jumping between desktop apps for a five-second hex sample wastes flow — browser tools sit next to your docs and Storybook tab.
Hand-coded :root blocks drift from Figma tokens — Theme Builder and Design System Generator export consistent variables.
OAuth and marketing link bugs often trace to double-encoded URLs — local encode/decode avoids pasting secrets into random websites.
Favicon and OG packages need multiple sizes — generators produce the set instead of manual Image Tools resize loops.
Extract Colors From Website accelerates competitive audits when rebuilding a component library — sample public pages, not private staging behind auth.
Manifest and PWA icon generators align with favicon packages so install prompts show crisp icons on Android and iOS home screens.
Featured tools
Palette Generator
Extract a balanced dominant-color palette from any image for UI and brand work.
Contrast Checker
WCAG contrast ratios with AA/AAA pass indicators for text and UI.
Theme Builder
Compose primary, accent, and surface tokens with live preview and CSS export.
Gradient Pro
Linear, radial, conic & repeating CSS gradients with live preview and PNG export.
Favicon Package
Generate 16, 32, 48, 180, 192 & 512 px icons plus a ZIP for your site.
URL Encoder
Encode text and URLs for safe use in query strings and links.
Design System
Export color scales, typography, spacing & radius tokens as JSON.
Image Colors
Pull UI and brand colors from screenshots while filtering browser chrome.
Tool categories
Color Tools
Featured pickers, palettes, gradients & design systems
Color Picker Pro
Precision eyedropper — click any image to sample hex, RGB and build a swatch list.
Palette Generator
Extract a balanced dominant-color palette from any image for UI and brand work.
Gradient Pro
Linear, radial, conic & repeating CSS gradients with live preview and PNG export.
Mesh Gradient
Build modern multi-blob mesh gradients for hero sections and landing pages.
Shade Generator
Generate a full 50–900 tint/shade scale from one brand hex color.
Contrast Checker
WCAG contrast ratios with AA/AAA pass indicators for text and UI.
Image Colors
Pull UI and brand colors from screenshots while filtering browser chrome.
Website Colors
Scan a live URL for theme-color and meta tag hex values.
+ 2 more in this group — browse explore
Icons & Assets
Favicons and icon workflows
PNG to ICO
Create Windows ICO icon files from PNG images.
ICO to PNG
Extract ICO icon files to PNG images.
OG Image Generator
Design a 1200×630 Open Graph share image with title, subtitle, and brand colors.
Favicon Package
Generate 16, 32, 48, 180, 192 & 512 px icons plus a ZIP for your site.
PWA Manifest
Build a web app manifest.json for installable PWAs with theme colors.
Screenshot Beautifier
Add padding, rounded corners, shadows, and backgrounds to screenshots.
Browser Mockup
Wrap website screenshots in a realistic light or dark browser chrome frame.
Favicon Generator
Resize logos to 32×32, 48×48, and 180×180 px favicon and app-icon sizes.
Common workflows
Brand color system bootstrap
From logo JPG to CSS variables.
- 1Extract dominant colors with Color Palette Generator or Extract Colors From Image.
- 2Build scales with Color Shade Generator and verify contrast with Color Contrast Checker.
- 3Export :root variables from Theme Builder Studio or Design System Generator.
- 4Document tokens in repo README for team alignment.
- 5Use Color Tools category for deeper gradient and mesh workflows.
Production favicon and PWA icons
Ship icons browsers and platforms expect.
- 1Start from square SVG or PNG master at least 512 px.
- 2Run Favicon Package Generator or Favicon Generator for multi-size ICO/PNG set.
- 3Add manifest.json with Manifest Generator if building installable PWA.
- 4Validate favicon links with Favicon Checker under SEO Tools after deploy.
- 5Upload assets to CDN or static /public folder.
Debug campaign and OAuth URLs
When redirect_uri or UTM strings break.
- 1Paste failing URL into URL Parser to inspect components.
- 2Decode query segments with URL Decoder to find double-encoding.
- 3Re-encode corrected values with URL Encoder before pasting into provider consoles.
- 4Test redirect in staging with clean browser profile.
- 5Document final URL shape in ticket for QA.
Open Graph image from brand template
Ship share cards with correct dimensions.
- 1Export 1200×630 art or build from Theme Builder color tokens.
- 2Compress with JPEG Compressor if file weight exceeds social crawler limits.
- 3Paste absolute image URL into Open Graph Generator under SEO Tools.
- 4Validate with Open Graph Preview on staging URL.
- 5Deploy and re-fetch in Facebook Sharing Debugger or LinkedIn Post Inspector.
Helpful tips
- Contrast check text and UI pairs at real font sizes — passing AA on 18px bold differs from 12px labels.
- Keep brand hex in version control — generator output is a starting point, not the source of truth alone.
- Clear URL tool panels after working with tokens or PII in query strings.
- PNG to ICO and SVG to PNG live under Image Tools when raster steps precede favicon packaging.
- Cross-link Color Tools for dedicated gradient and vision-simulation utilities.
- Pair with SEO Open Graph Generator after OG image assets exist.
- Version-control exported token JSON alongside CSS — diff tokens in PR review like any other config.
- When sampling colors from client photos, confirm usage rights before extracting palette from proprietary imagery.
- SVG favicons scale cleanly — pair SVG to PNG with Image Tools when legacy IE targets are finally dropped from support matrix.
Explore further
Related categories
Color Tools
Color Tools centralize palette extraction, gradient design, WCAG contrast checks, hex/RGB/HSL conversion, and CSS token export for UI and brand work.
SEO Tools
Apex Toolz SEO Tools span image SEO, web meta generators, live preview checkers, and YouTube character-limit utilities for publishers and developers.
Image Tools
Apex Toolz Image Tools cover format conversion, compression, resizing, cropping, metadata, and batch workflows — all in your browser without uploading files to a server.
Text Tools
Text Tools provide counting, casing, sorting, diffing, slug generation, UUID and regex utilities for writers, developers, and SEO workflows — processed locally in the browser.
Frequently asked questions
Summary
Developer Tools deliver color, asset, and URL utilities for front-end engineers and designers shipping production sites. Each tool has a dedicated URL for focused tasks.
Use brand bootstrap, favicon, and URL debug workflows to reduce handoff friction. Featured tools include Color Palette Generator, Theme Builder Studio, and URL Encoder.
Explore Color Tools for expanded color science utilities, SEO Tools for meta and OG tags after assets ship, and Image Tools when raster conversion precedes icon generation.
Developer Tools sit between design and deploy — bookmark the utilities your squad uses weekly so new hires find URL Encoder and Favicon Package Generator without searching Slack history.
Front-end interviews and take-home exercises sometimes include favicon or palette tasks — these tools let candidates produce real output without pirated software or trial expirations blocking their submission.
URL Parser helps debug deep links in mobile apps when custom schemes and universal links mix query parameters from marketing attribution platforms.