UD5 Toolkit
Custom Lorem Ipsum Generator – Words, Sentences & Paragraphs
Generate dummy text with precise control: number of paragraphs, sentences per paragraph, and words per sentence. Also choose between Lorem Ipsum and random English.
Developer Tools - Utilities for Coders
99+ toolsHTML Boilerplate Generator – Custom HTML5 Skeleton
Configure a modern HTML5 boilerplate with your choice of meta tags, social media cards, favicon links, and CSS/JS includes. Download or copy the code.
CSS Obfuscator – Minify & Mangle Class Names
Obfuscate CSS by mangling class names and removing whitespace for production. Use with caution and export a mapping file to keep references intact.
Grid Overlay Tester – Overlay Custom Grids on Live Sites
Enter a URL and apply a custom CSS grid overlay to check alignment. A quick frontend design tool for verifying column placement and baseline grids.
Date Locale Previewer – Online Intl.DateTimeFormat Visualizer
Select a date, time zone, and locale to see how it appears in various formats (long, short, etc.). Ensure correct i18n.
Image Silhouette to clip‑path – Online Polygon Extraction
Trace the edge of an object in an image and generate a CSS clip‑path polygon. For non‑rectangular layouts.
Windows Shortcut Driller – Online Random Win+Key Prompt
Randomly prompts you to press a Windows keyboard shortcut (e.g., Win+E). Learn to be a power user.
Nerd Font Icon Previewer – Online Search & Copy Glyphs
Browse all Nerd Font icons by category. Click to copy the glyph character. For terminal and prompt customization.
npm Package Name Checker – Online See If Slug Is Taken
Enter a name and query npm registry via public API to check if it's taken or scoped. Quick.
Get Installed Related Apps Demo - Online PWA Detection
Check if your related native or PWA app is installed. See the API in action and copy the code.
Caching Strategy Visualizer – Online Cache First vs Network First
Select a caching strategy and see a flow diagram of how requests are handled. Learn PWA patterns.
Pair Programming Role Assigner – Online Random Driver/Navigator
Enter names and randomly assign driver and navigator roles. Rotate fairly. Team tool.
SSL Certificate & Key Pair Matcher - Online Verify Match
Paste an SSL certificate and private key to verify they belong together. Check if a CSR matches a private key. All local crypto.
size‑container Demo - Online Intrinsic & Styled Queries
Explore the size‑container and inline‑size CSS properties for container queries. Understand containment contexts. Visual guide.
Element Blend Mode Tester - Online See mix-blend-mode
Overlay colored blocks and images and apply all mix‑blend‑mode values. Understand how each mode works live.
CSS Box Reflect Generator - Online WebKit Mirror Effect
Create a reflection effect for images or text using box‑reflect. Adjust direction and offset. Copy the CSS.
caret‑color CSS Demo - Online Colorful Text Cursors
Change the text input cursor color. See the effect live. Copy the minimal CSS. Simple but delightful.
empty‑cells CSS Property Demo - Online Table Visibility
Toggle between show and hide for empty table cells. Understand how it affects borders and backgrounds.
CSS tab‑size Property Demo - Online Control Indentation
Set tab‑size to any number and see how tabs are displayed in a pre element. Essential for code snippets.
Skip Navigation Link Generator - Online A11y Helper
Create a properly styled 'Skip to Content' link. Customize target and appearance. Essential for keyboard users. Copy the HTML/CSS.
CSS Cursor Demo - Online Preview All Pointer Styles
Hover over tiles to see every CSS cursor value in action. Quick visual reference for choosing the right UI feedback.
@font‑face Generator - Online Custom Web Font Snippet
Upload a font file or specify a URL and generate the complete @font‑face rule with modern formats and font‑display. Copy instantly.
JSON to PlantUML Diagram – Online Visualize Data Structure
Paste a JSON object and generate PlantUML code for a class or object diagram. Preview rendered image.
Visual Cron Schedule Builder – Online Next 10 Runs Preview
Build a cron expression using plain English toggles and see its visual timeline. No memorization needed.
HTML Class Name Shortener – Online Reduce File Size
Replace long CSS class names with short random strings. Map generated. For production optimization.
CSS Declaration Sorter – Online Organize Properties
Paste a CSS rule and sort its declarations alphabetically or by box model grouping. Clean up styles.
Next.js Page Boilerplate - Online App Router Setup
Generate a Next.js page.tsx file with Server Component or Client Component. Layout and metadata included.
Advanced Number Base Converter - Online Bin Oct Dec Hex Custom
Convert numbers between binary, octal, decimal, hex, and any custom base up to 36. With live preview of all bases.
CSV to GeoJSON Converter - Online Map Data Generator
Map CSV columns with latitude/longitude to GeoJSON points. Create map‑ready data instantly. All local.
Error.cause Property Demo - Online Chained Errors
Create errors with the cause option and see chained error objects. Learn error wrapping for better debugging.
Font Loading API Demo - Online Wait for Fonts Ready
Use the document.fonts API to check if a font is loaded. Watch the ready promise. Avoid FOUT. JavaScript demo.
DNS Record Lookup - Online Query A, AAAA, MX, TXT
Query DNS records for any domain directly from your browser using DNS-over-HTTPS. See A, AAAA, MX, CNAME, and TXT. No logs.
IndexedDB Browser - Online View & Edit Client‑Side DB
Explore your website’s IndexedDB databases and object stores. Add, delete, and inspect records. Like phpMyAdmin for IndexedDB.
Web Component Generator - Online Create Custom Element
Fill in a name and template to generate a complete Web Component class with shadow DOM. Start your library.
Canvas Sprite Animation - Online Play Sprite Sheet
Load a sprite sheet, define frames, and play an animation on a canvas. Control frame rate and loop. Game dev tool.
Houdini Paint Perspective Cube - Online CSS Art
A paint worklet that draws a moving 3D cube. See Houdini in action and copy the JS file. Modern CSS magic.
Canvas Pattern Maker - Online Repeat Image Tiles
Upload a small image and see it tiled as a canvas pattern. Export the pattern or copy the JavaScript.
Fetch Upload Progress Demo - Online Track XHR & Fetch
See how to implement file upload progress using both fetch and XHR. Real‑time bar and code snippets for your project.
CSS Snowfall Effect Generator - Online Winter Animation
Customize falling snow particles with pure CSS or canvas. Adjust speed, size, and wind. Copy the code for your website.
DOM Size Inspector - Online Count & Warn for Performance
Count total DOM nodes on the current page and show warnings if limits exceed best practices. Keep the DOM lean.
Content Indexing API Demo - Online Show in System Launcher
Add web content to the device’s content index (like Google Discover). See the indexed items and delete them.
Email‑Safe Button Generator – Online Inline CSS Bulletproof
Create colorful, bulletproof HTML buttons for email. Uses VML for Outlook, graceful fallback for others.
YAML to JSON Schema Converter - Online OpenAPI Infer Structure
Paste a YAML example and generate a JSON Schema draft that matches the structure. Helps build API specs. Pure client-side inference.
CSS Animation Library Browser - Online Preview & Copy Keyframes
Browse a collection of ready-to-use CSS animations (fade, slide, bounce). Click to preview, then copy @keyframes and class to your project. Local tool.
SCSS to CSS Converter - Online Free Sass Compiler
Compile SCSS code to CSS directly in the browser using the official Sass.js library. Supports variables, mixins, nesting. No server upload required.
Webhook Tester & Inspector - Online View Incoming Payloads
Generate a temporary webhook URL (mock) and view the JSON payloads sent to it. Great for testing integrations locally.
SolidJS Component Scaffold - Online Quick .tsx Template
Generate a SolidJS component with signals, props, and styles. Choose TypeScript. Copy the ready‑to‑use code.
CSS Anchor Positioning Center Demo - Online Pin to Parent
Use anchor positioning to perfectly center a popover relative to its anchor. No JavaScript. See the modern approach.
Two‑Pass Assembler Simulator - Online Simple SIC/XE
Write a simple assembly program and see the pass‑1 and pass‑2 symbol tables and object code. Systems programming helper.
CSS‑in‑JS Runtime Cost Simulator - Online Render 1000 Nodes
Render 1000 styled elements using inline styles vs. CSS classes and compare time. Understand CSS‑in‑JS trade‑offs.
Image Alt Text Linter - Online Check Missing & Redundant Alts
Paste an HTML snippet and get a report on missing, empty, or suspicious alt texts. Improve your image SEO and a11y.
Viewport Meta Tag Simulator - Online Test Mobile Rendering
Change the viewport meta tag and see how a page would render at different device widths. Understand responsive basics.
<selectlist> New HTML Element Demo - Online Rich Select
Test the upcoming <selectlist> element for a fully customizable, stylable select dropdown. Experimental browser feature.
animation‑composition Demo - Online Blend Multiple Animations
See how `animation‑composition: replace, add, accumulate` works by layering animations on the same property. Understand the spec.
CSS Cursor Playground - Online Preview All Pointer Styles
Hover over tiles to see every CSS cursor value in action. Quick visual reference for choosing the right UI feedback.
Chakra UI Theme Builder - Online Custom Design Tokens
Define brand colors, fonts, and spacing. Generate the Chakra UI extendTheme object. Export as JSON or JavaScript.
CSS Variable Theme Builder - Online Light & Dark Mode
Define a set of colors for light and dark themes. Get the CSS custom properties snippet. Toggle live.
Color to Tailwind Class Converter - Online Map Hex to closest
Enter any hex color and find the nearest Tailwind CSS color class. Also shows the Tailwind palette shade.
Media Query Live Tester - Online Resize & See Results
Write a media query and see if it matches as you resize the iframe. Understand width, height, and resolution queries.
Speech Dispatcher Tester - Online Explore All Voices
List all available TTS voices on your system. Test each with any text. Adjust rate and pitch. Find the best voice.