UD5 Toolkit
Regex Injection / ReDoS Tester - Online Safe Pattern Test
Test a regular expression against malicious inputs to detect catastrophic backtracking and ReDoS vulnerabilities. Educational.
Trusted Types API Demo - Online Prevent XSS
Trusted Types API Demo
Online XSS Prevention Sandbox & Security Playground
PDF Script Inspector - Online See Embedded JavaScript
Drop a PDF and extract any embedded JavaScript or form actions. Check for malicious code. Privacy‑friendly analysis.
Launch Handler API Demo - Online Control App Launch Behavior
Configure how your PWA launches: focus existing or create new. Test with the launch_handler manifest field.
CSS Scroll Snap Demo - Online Carousel & Gallery
Build a horizontal scroll‑snap container with configurable snap‑type and alignment. Perfect for image galleries.
UI Animation Timing Demo - Online Easing Presets
Compare all CSS easing presets side by side on a bouncing ball. See which curve fits your UI animation.
Permissions Query API Demo - Online Check All APIs
Query the permission state of camera, microphone, geolocation, and more. See the response and learn the API.
OfflineAudioContext Demo - Online Render Audio Fast
Process audio faster than real‑time with OfflineAudioContext. Apply filters and export the result. Dev tool.
Drag & Drop File Upload Demo - Online With Preview
Drop files onto a zone and see a preview with name, size, and type. Copy the JavaScript pattern for your site.
EventSource Polyfill Demo - Online See SSE with Custom Headers
Demonstrate how to add custom headers and POST‑like functionality to EventSource using a polyfill. Code and example.
position: sticky Playground - Online Sticky Headers & Footers
Scroll a container and see how sticky elements behave. Adjust top, bottom, and scroll margins. Copy the code.
WebGPU Bunny Demo - Online Simple 3D Renderer
Render the classic Stanford Bunny with a basic WebGPU pipeline. Rotate and zoom. Check if your browser supports WebGPU.
scroll‑padding & scroll‑margin Demo - Online Anchor Position
See how scroll‑padding and scroll‑margin affect the position of elements when using anchor links or scroll‑snap. Visual.
Built-in Translation API Demo - Online On‑Device Translate
Test the experimental Translation API to translate text between languages directly in the browser, without cloud calls. Check support and copy the JavaScript starter.
DNSSEC Chain Validator - Online Check RRSIG & DS
Validate a DNSSEC chain by entering DS and RRSIG records. Verify that signatures match. Educational. Local algorithm.
Permissions‑Policy Header Parser - Online Decode & Check
Paste the Permissions‑Policy header and get a human‑readable table of allowed/blocked browser features. Understand how your site is restricted.
Web Worker Image Filter - Online Heavy Processing Demo
Apply a convolution filter (blur, sharpen) using a Web Worker. See the UI stay responsive while processing. Learn multithreading in the browser.
scrollbar‑gutter Tester - Online Prevent Layout Shift
Toggle scrollbar‑gutter: stable to reserve space for the scrollbar and avoid content jumps. Visual demo with two columns.
Web Locks API Demo - Online Resource Coordination
Acquire and release locks across tabs. Prevent race conditions in IndexedDB or localStorage. Visual queue and lock state.
Periodic Background Sync Demo - Online PWA Feature
Register a periodic background sync to fetch fresh data even when the tab is closed. Understand the API and limits.
HSTS Header Checker - Online Strict‑Transport‑Security
Fetch a site’s HSTS header and validate its syntax, max‑age, and subdomain flags. Ensure your site enforce HTTPS.
Fullscreen API Tester - Online Request & Exit Demo
Test the Fullscreen API: request fullscreen on a colored div, detect changes, and copy the JavaScript boilerplate.
View Transitions API Demo - Online Smooth Page Switch
See the View Transitions API in action. Cross‑fade and morph between two states. Copy the JavaScript starter code.
Iframe Sandbox Configurator - Online Test Permissions
Build an iframe with different sandbox flags and see live which features are blocked. For secure embedding.
String to Escaped HTML - Online Protect Against XSS
Instantly convert plain text into HTML‑safe escaped characters for secure display in web pages. Prevent cross‑site scripting. All processing local.
Elephant Toothpaste Demo Calculator - Online Reaction Ratios
Find safe mixing ratios for the classic elephant toothpaste demonstration. Volume adjustments for different container sizes.
HTML Sanitizer - Online Clean Dangerous Tags & XSS Prevention
Strip dangerous HTML tags and attributes (scripts, onclick) to prevent XSS attacks. Safe iframe preview. Local sanitation engine.
Phishing Email Checker - Online Suspicious Link Analyzer
Paste email headers or body text to quickly spot phishing signs, suspicious domains, and obfuscated links. Educational and private.
HTML Escape/Unescape - Online Encode Special Characters
Escape HTML special characters to prevent XSS attacks, or unescape HTML entities back to original text. Essential for web developers. Runs locally.
Password Strength Checker - Online Meter & Analyzer Tool
Evaluate the strength of your passwords with a visual meter and detailed feedback. Check for length, complexity, and breached passwords. All analysis is client-side.
Strong Password Generator - Online Random Secure Passwords
Generate ultra-secure, random passwords with configurable length and character sets. Created entirely on your device; never transmitted or stored.