UD5 Toolkit
object‑view‑box Demo - Online Zoom Into Image
Crop and zoom into an image using the object‑view‑box property. Define inset(). Great for responsive art direction.
Shipping Box Size Optimizer - Online Fit Items into Carton
Carton Dimensions (inner)
cm
cm
cm
Items to Pack
Max 30 items; allowed rotation: all 6 orientations.
Frequently Asked Questions
It calculates the optimal placement of rectangular items into a shipping carton, considering all possible rotations, to maximize space utilization and minimize unused volume. You input carton inner dimensions and item dimensions, and it provides a visual packing plan and utilization metrics.
We use a heuristic (greedy with maximal spaces) that produces high-quality results for most practical cases. It is not guaranteed to find the perfect global optimum, but it outperforms simple volume-comparison tools and works reliably for up to 30 items.
Yes, the optimizer automatically considers all 90-degree rotations (length, width, height permutations) for each item to find the best fit.
Utilization % = (total volume of placed items / carton inner volume) Ă— 100. It reflects how efficiently the carton volume is used.
Currently this tool handles only rectangular boxes. Weight distribution and irregular shapes are not supported.
3D Packing Visualization
Drag to rotate (placeholder)
Enter carton and items, then click Optimize Packing.
Audio Volume Normalizer - Online Loudness Equalizer
Adjust an audio file's volume to a target loudness level (e.g., -14 LUFS). Prevent clipping. Works in the browser.
Product Schema Markup Generator - Online JSON‑LD for Ecommerce
Create a Product structured data with reviews, price, and availability. Boost your ecommerce visibility in search.
Laundry Symbol Decoder – Online Wash, Dry, Iron Guide
Click to build a laundry symbol and learn its meaning, or look up common symbols. Never ruin clothes again.
JSON Path Finder - Online Search & Extract from Object
Search and extract values from a large JSON object using dot/bracket notation. Quickly locate deeply nested fields. Data stays local in your browser.
Page Replacement Simulator - Online FIFO, LRU, Optimal
Simulate memory page reference strings with FIFO, LRU, and Optimal algorithms. See page fault count. OS concept demo.
Paint Color Visualizer – Online Test Wall Colors on Sample Rooms
Simulate paint colors on a pre-loaded room photo by adjusting hue, saturation. Find your perfect shade before buying. Local canvas.
JSON to JSON Schema Generator - Online Infer Structure
Paste a sample JSON object and generate a basic JSON Schema describing its types and required fields. Local inference.
SQL Formatter & Beautifier - Online SQL Query Cleaner
Format and beautify SQL queries for improved readability. Supports various SQL dialects. Quick syntax highlighting and local processing ensure a secure experience.
Leather Stitching Spacing Guide – Online SPI for Projects
Select project type and leather weight to get recommended stitch spacing and thread size.
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.
Cover Letter Generator - Online Customizable Job Application
Create a tailored cover letter based on job title, your skills, and a template. Download as text or PDF print. Private.
Image FFT Visualizer - Online See Frequency Domain
Upload an image and see its 2D FFT magnitude and phase. Learn how image filtering works. Educatinal tool. Canvas.
WebSocket Load Tester - Online Simulate Many Clients
Open many parallel WebSocket connections and send messages. Test your server's concurrency. All from your browser.
JSON to Graph Visualization - Online Tree Diagram
Paste a JSON object and see a dynamic, draggable tree graph representation. Excellent for debugging nested data.
Crontab Expression Editor - Online Interactive Cron Builder
Build cron expressions using a visual editor with dropdowns. See human-readable description and next run times. Easier than raw cron.
JWT Debugger - Online JSON Web Token Decoder & Verifier
Decode the header and payload of a JSON Web Token (JWT) without verifying the signature. Inspect claims securely on the client side. Great for developers.
Favicon .ico Maker - Online Multi‑Size Generator
Upload a logo and generate a complete favicon package: .ico with 16, 32, and 48px sizes. No upload needed.
CPU Scheduler Simulator - Online FCFS, SJF, Round‑Robin
Enter processes and see how different scheduling algorithms handle them. Gantt chart generation. OS course helper.
Crystal Load Capacitance Calculator - Online Pierce Oscillator Tool
Calculate load capacitors for a crystal oscillator given stray capacitance and crystal CL. Essential for microcontroller circuit design. Local.
Gamepad Tester - Online Button & Axis Visualizer
Connect a game controller and see every button press, axis movement, and vibration test. Uses the Gamepad API.
Local Business Schema Generator - Online JSON‑LD for SEO
Generate a LocalBusiness structured data snippet with name, address, phone, and opening hours. Boost local SEO.
Small Claims Court Case Organizer – Online Prepare Your Claim
Fill in plaintiff, defendant, claim details and organize supporting documents. Print a summary for court. Local only.
Home Repair Cost Estimator – Online Get Rough Job Prices
Select a repair type (leaky faucet, paint room, etc.) and get a typical cost range. Simple general guide, no personal data.
JSON to Properties File Converter - Online Java Config
Convert a flat JSON object into a Java .properties file format. Handle nested values by dot notation. Local only.
Text to Character Array - Online For Programmers
Split a text into an array of individual characters, ready to paste into code. Options for quotes and newlines.
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.
Function Graph Plotter - Online Math Visualizer 2D
Plot one or more mathematical functions f(x) on a 2D canvas. Zoom, pan, and see intersections. Great for calculus and algebra. Purely client‑side.
Spice Rack Organizer – Online Track Freshness & Quantity
Catalog your spices with purchase date, so you know what's still potent. Search and sort. Local database.
package.json Generator - Online Interactive Creator
Fill in a form to generate a valid package.json for your Node.js project. Includes popular scripts and fields. Local only.