UD5 Toolkit
Running Shoe Size Converter - Online US UK EU CM Chart
Convert running shoe sizes between US (men/women), UK, EU, and centimeters. Also includes brand-specific fit notes (general guide).
Tag: File & Image Size Reducer
20+ toolsDiaper Size Finder - Online Weight-Based Size Guide
Enter baby's weight in lbs or kg to see suggested diaper sizes across major brands. General reference, no data collected.
Luggage Size Checker - Online Airline Carry-On Compliance Tool
Enter your bag dimensions and compare against major airline carry-on and checked limits. Visual pass/fail gauge. Avoid gate fees.
Shipping Box Size Optimizer - Online Fit Items into Carton
Enter item dimensions and find the smallest rectangular box that can fit them (simple packing heuristic). Helps reduce shipping costs. Local algorithm.
Crochet Hook Size Converter – Online US, UK, Metric, JP
Enter a hook size in any system and instantly see the equivalent in all other standards.
Crochet Hat Sizing Guide – Online Measure & Increase
Enter head circumference to get crown diameter and length. Perfect fit top‑down hats.
Photo Print Size Guide - Online Aspect Ratio to Dimensions
Enter image pixel dimensions and compute maximum print size at various DPI. With aspect ratio presets (4x6, 5x7, 8x10) and cropping preview. Local tool.
Window Size Detector - Online Outer & Inner Dimensions
See outerWidth, innerWidth, outerHeight, innerHeight, screenX/Y, and availWidth/Height live. Understand the viewport.
Bird Harness Size Guide – Online Measurement & Fit
Enter your bird species and weight to find the correct harness size. Visual adjustment guide.
Moving Truck Size Calculator – Online Bedrooms to Cubic Feet
Enter number of bedrooms and large items to estimate the truck size you need. Avoid multiple trips. Simple local estimator.
Blanket Size Chart – Online Crib, Throw, King Dimensions
Reference for standard blanket and afghan sizes in inches and cm. Perfect for knitters and crocheters.
Viewport & Document Size Viewer - Online Real‑Time
See the current viewport width/height, document size, scrollbar width, and pixel ratio. Essential responsive data.
Element Resize Detector - Online Monitor Size Changes
Select any element on the test page and monitor its size changes with ResizeObserver. See log of all entries.
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.
Paper Size Converter - Online A4, Letter, Legal Dimensions
See exact mm and inch dimensions of ISO A-series and US paper sizes. Visual comparison tool. Also calculates weight based on GSM and dimensions.
PDF Compressor - Online Reduce File Size Locally
Shrink a PDF file size with configurable image quality and object removal. All processing stays in your browser.
Resize Observer Playground - Online Watch Element Size
Drag to resize a box and see the Resize Observer callback fire. Get contentRect and borderBoxSize. Learn the API.
Tire Size Visualizer - Online Compare & Dimensions
Enter two tire sizes and see a side‑by‑side comparison of diameter, width, and speedometer error. Local math.
HTML Minifier - Online Compress Web Pages
Reduce your HTML file size by stripping whitespace, comments, and optional closing tags. Secure browser‑based.
Web Image Size Calculator - Online KB & Dimensions Tool
Predict the file size of an image based on pixel dimensions and format (JPEG, PNG, WebP). Rough estimate. Local.