UD5 Toolkit
Gradient Border CSS Generator - Online Animated & Static
Design borders with linear or conic gradients. Supports border‑image and background‑clip methods. Copy optimized CSS.
Pixel Art Drawing Board - Online Retro Sprite Maker
Pixel Art Maker
ASCII Text Signature Generator - Online Figlet & Banner
Type your name and create a stylized ASCII text banner for email signatures or forum posts. Choose a font style.
Handwriting Worksheet Generator - Online Traceable Letters
Create custom traceable handwriting worksheets with name or sentence. Print in dotted font. Great for teachers and parents.
CSS Easing Curves Visualizer - Online Cubic & Steps
Graph a cubic‑bezier or steps easing function and see a bouncing ball animation using it. Copy the CSS timing‑function.
Pathfinding Visualizer - Online A*, Dijkstra & BFS Grid
Draw walls on a grid and watch A*, Dijkstra, or BFS find the shortest path. Interactive animation. Learn graph traversal.
HTML Email Signature Builder - Online Professional Footer Creator
Create a polished HTML email signature with your photo, links, and company details. Live preview and copy HTML to clipboard. Works with Gmail, Outlook, Apple Mail.
Screen Color Depth Checker - Online 8‑bit vs 16‑bit
See your monitor's color depth and pixel depth. Detect if HDR or wide gamut is available using media queries.
Email Signature Generator - Online Professional HTML Footer
Design a clean, professional email signature with your photo, links, and disclaimers. Copy the HTML to use in Gmail/Outlook.
Traceroute Simulator - Online Visual Hop Path
Simulate a traceroute by entering a destination IP. Learn about AS paths and latency. Does not send real packets; educational visualisation.
Screen Reader Text Visualizer - Online View Hidden A11y Content
Paste a website's HTML and see which text is only visible to screen readers (e.g., .sr‑only). Preview the accessible layer.
Unicode Blocks Browser - Online Explore All Scripts
Browse Unicode by block: Latin, Cyrillic, CJK, Emoticons. See characters and copy with a click. Full reference.
Query String Parser & Builder - Online URL Params Editor
Parse a URL's query string into a key-value table, or build a query string from parameters. Perfect for API testing and web development.
Screen Reader Text Preview - Online See Hidden A11y Labels
Enter HTML with aria-labels and see what a screen reader would announce. Simulates common patterns. Local educational tool.
Telegram Bot Markdown/HTML Builder - Online Message Formatter
Compose messages with bold, italic, links, and code. See the raw HTML or Markdown for your Telegram bot API calls.
Screen Reader Test Snippet - Online Check HTML ARIA Labels
Paste an HTML snippet and see how a screen reader might interpret it. Highlights missing alt texts and ARIA misuses. Educational.
XSS Payload Sandbox - Online Test Escape Characters
Paste a potential XSS vector and see if it executes in a sandboxed iframe. For security researchers and education.
Redirect Rule Tester - Online See How Browsers Follow
Enter a URL and see the full redirect chain with status codes and response times. Also validates against your chosen rule.
User Agent Parser - Online Browser & OS Detector
Paste a user agent string to get a human-readable breakdown of browser, operating system, and device. See your own current agent info automatically.
HTTP Security Header Checker - Online HSTS, CSP, X-Frame Analysis
Paste response headers string and get a security audit. Check presence and configuration of key security headers. Local analysis.
JWT Viewer & Verifier - Online Decode & Check Signature
Paste a JSON Web Token and decode its header and payload. Verify signature if you provide the secret. Fully local.
Iframe Sandbox Configurator - Online Test Permissions
Build an iframe with different sandbox flags and see live which features are blocked. For secure embedding.
Content Security Policy Evaluator - Online Hash & Nonce Check
Test if a script or style will be allowed by a given CSP. Compute hash/nonce. Strengthen your site’s defense against XSS. Local.
Robots.txt Validator - Online Check Syntax & Rules
Paste a robots.txt file and validate its syntax. See if a specific user‑agent can access a path. Essential for webmasters.
Constraint Validation API Tester - Online Form Debug
Test required, pattern, minlength etc. See validity states and custom error messages. Learn browser‑native validation.
Browser Extension Headers Check - Online Detect Injected Scripts
Look at HTTP headers and JavaScript objects to guess which browser extensions might be installed. For awareness.
JSON Diff Compare - Online Highlight Differences
Paste two JSON objects and find the structural differences with side‑by‑side highlighted output. Indispensable for API debugging.
Text Diff Checker - Online Compare & Find Differences
Compare two text blocks and highlight differences line by line. Ideal for code review and document revisions. All diffs computed locally for privacy.
Pixel Art Coloring Book – Online Click to Fill Grid Cells
Choose a pre-drawn pixel outline and fill cells with colors. Save your masterpiece. Meditative fun.
Pixel Art Upscaler - Online Nearest‑Neighbour Enlarge
Enlarge pixel art or low‑res images without blur. Choose 2x, 4x, 8x. Perfect for sprites. Download scaled PNG.
Multi‑User Whiteboard (Local) - Online Shared Drawing
Open the same page in two tabs and draw together in real time using BroadcastChannel API. Share ideas without a server.