UD5 Toolkit
Online Text Diff Checker – Compare Two Versions Side by Side
Paste two text blocks to see a line‑by‑line diff with added lines in green and removed lines in red. Ideal for code reviews and editing.
Developer Tools - Utilities for Coders
999+ toolsAccessible Name & Description Inspector – Generate Aria Labels
Enter a visual UI element and the tool suggests proper aria‑labels and descriptions. Learn to write meaningful text for screen readers.
Semantic Versioning Range Intersection Finder
Enter two semver ranges (e.g., ^1.2.3 and >=1.2.4 <2.0.0) to see if they intersect and what the maximum satisfying version is.
HTML <head> Element Optimizer – Best Practice Checklist
Paste your <head> section to check for missing favicon links, social meta tags, preload hints, and proper charset. Get a score and improvement list.
Web Font Subset Generator – Reduce Font File to Only Used Glyphs
Paste the characters your site uses and upload a TTF/OTF font. Download a smaller, subsetted WOFF2 for faster page loads.
Full‑Page Website Screenshot Tool – Enter URL, Get PNG
Enter a public URL and capture a full‑length PNG screenshot of the entire page. No install needed, processed in the cloud.
JSON to GraphQL Schema Converter – Quick Type Defs
Paste a sample JSON response and get back a GraphQL type definition. Speeds up mocking an API layer from a REST endpoint.
Semantic Versioning Bump Calculator – What’s My Next Version?
Select the type of change (breaking, feature, fix) and your current version to see the next semantic version number and git tag suggestion.
Wireframe to HTML Skeleton – Quick Layout Boilerplate
Select a layout (header‑content‑footer, sidebar, grid) and get the basic HTML5 structure with CSS grid or flexbox to start prototyping.
Data URI Generator – Convert Any File to Inline Data
Convert any small file (CSS, font, image) into a data URI that can be placed directly in HTML or CSS. Reduces HTTP requests for tiny assets.
Glassmorphism Generator – Background Blur & Transparency CSS
Design glassmorphic UI elements by tweaking blur, transparency, border, and shadow. Copy the resulting CSS for cards, navbars, or modals.
PX to REM & EM Converter – Scalable CSS Units
Convert pixel values to rem or em based on the root font size. Also batch‑convert an entire CSS snippet, replacing px with rem for accessibility.
SRI Hash Generator – Generate Integrity Attributes for Scripts
Paste the content of a JavaScript or CSS file and get its SHA‑256, SHA‑384, or SHA‑512 integrity hash. Build the full <script> tag with crossorigin.
International Slug Transliterator – Remove Diacritics for URLs
Convert text containing accented characters (é, ü, ñ) to their ASCII equivalents for clean, readable URL slugs. Supports many European languages.
API Key & Secret Generator – Secure Random Strings
Generate cryptographically secure random strings suitable for API keys, secrets, and tokens. Choose length and character set (hex, base64, alphanumeric).
HTML Character Entity Lookup – Search by Name or Symbol
Search over 1,400 HTML character entities by name, number, or just by typing a symbol. Click to copy the entity code for your markup.
Browser Feature Compatibility Lookup – Can I Use Data
Search any HTML, CSS, or JavaScript feature and instantly see browser support percentages and version notes. Offline‑capable with embedded data.
Interactive GraphQL Query Builder – Point & Click
Paste a GraphQL schema or introspection result and build queries by checking fields. See the resulting query string and copy it for use in your app.
Cron Expression Tester – See Next 10 Execution Times
Enter a cron expression (e.g., */15 * * * *) and see the next 10 dates and times it will trigger. Also explains the schedule in plain English.
Favicon Badge Generator – Add Notification Dot to Tab Icon
Upload your favicon and overlay a small numbered badge. Download the modified .ico and the JavaScript snippet to dynamically update the count.
Typing Effect Text Generator – Animated HTML & CSS Snippet
Type your message and get a self‑contained HTML/CSS snippet that animates a typing cursor. Customize speed, blink rate, and text color.
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.
Cookie String Parser & Editor – Read document.cookie
Parse a raw cookie string into a readable table. Edit values or create new cookies, then get the properly formatted string to set via JavaScript.
Emmet Live Tester – Preview Expansions Instantly
Type any Emmet abbreviation and see the expanded HTML or CSS in real time. A playground for learning and perfecting your Emmet skills.
CSS Text Gradient Generator – Gradient Fill for Headings
Apply smooth color gradients to text with a live preview. Generates cross‑browser CSS including the webkit‑background‑clip property.
ASCII Text to SVG Converter – Monospaced Diagram Art
Paste ASCII art or text‑based diagrams and convert them into a crisp SVG image. Preserves spacing and can be styled with CSS for documentation.
Markdown Link Checker – Find Broken Hyperlinks in Your Docs
Paste your Markdown file content and the tool extracts all links, then checks each one for a live response. Flag dead links before publishing your docs.
HTML 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.
CSS Specificity Battle – Compare Two Selectors Side by Side
Enter two CSS selectors and see which one wins in a specificity battle. Displays the (a,b,c) score and explains why one overrides the other.
Design Token Generator – Export Colors, Spacing & Typography
Define and export design tokens for your project. Choose colors, spacing, and fonts, then download as CSS custom properties, JSON, or SCSS variables.
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.
Mac Keyboard Shortcut Visualizer – Online Modifier Key Cheatsheet
Press a combination of modifier keys and see which common macOS shortcuts use them. Learn by experimentation.
Advanced Case Converter – Online snake_case camelCase kebab-case
Convert text between various programming case styles. Includes SCREAMING_SNAKE, PascalCase, etc.
Email‑Safe Button Generator – Online Inline CSS Bulletproof
Create colorful, bulletproof HTML buttons for email. Uses VML for Outlook, graceful fallback for others.
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.
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.
CSS Grid Cheatsheet – Online Interactive Template Areas
Visual reference for CSS Grid properties. Click to see code snippets and visual demos.
Code Review Focus Picker – Online Random Aspect to Check
Randomly picks a specific aspect to focus on (naming, security, performance) during code review. Sharpen reviews.
Pair Programming Role Assigner – Online Random Driver/Navigator
Enter names and randomly assign driver and navigator roles. Rotate fairly. Team tool.
Markdown to Word Snippet – Online Copy Formatted Text
Render Markdown and copy the formatted output as rich text to paste directly into Word or Google Docs.
URL Query String to JSON – Online Parse & Format
Paste a full URL or query string and instantly get a pretty JSON object. Parse arrays and nested keys.
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.
Advanced .gitignore Generator – Online Multi‑Tech Stack
Select multiple languages and tools (Node, Python, Mac, Windows) and generate a combined .gitignore.
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.
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.
CSS Color Converter All-in-One: Hex, RGB, HSL, OKLCH
Enter color in any CSS format and see all other representations. Live preview. Swatch history.
WHOIS Domain Lookup – Online Simple Registration Check
Enter a domain and see public WHOIS info via a free API with rate limiting. Quick domain check.
Browser Storage Quota Dashboard – Online See Usage
Check estimated usage and quota for local and session storage on your browser. Quick dev tool.
SVG Path D to Array – Online Extract Coordinates
Paste an SVG path d string and parse it into an array of commands and coordinates. Useful for animations.
Text to Unicode HTML Entities – Online Convert All Chars
Type text and get every character converted to &#xxxx; entities. Useful for encoding.
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.
JSON Duplicate Key Checker – Online Find Repeated Keys
Paste JSON and instantly see if any object has duplicate keys. Quick syntax spotter.
Viewport Unit Calculator – Online vw vh vmin vmax to PX
Enter a CSS value in vw/vh and see the actual pixel size at current viewport. Dynamic resize demo.
CSS Media Query Range Tester – Online Width/Height Debug
Paste media queries and see a visual indicator of which rules apply at current viewport size.
Image File Size Predictor – Online KB for Given Pixels
Enter width, height, format to approximate file size. Plan web performance. Simple model.