UD5 Toolkit
Leather Thickness Conversion – Online oz to mm Chart
Convert between ounces and millimeters for leather. Visual guide to common project thicknesses.
Markdown to HTML Converter - Online MD to Webpage Tool
Hello World
SSH Key Fingerprint Viewer – Online MD5 & SHA256 Hash
Paste a public SSH key to generate its fingerprint. Verify host keys. Local Web Crypto.
JSON to CSV Converter - Online Free Data Translator
Easily convert JSON data arrays into CSV format for Excel or database import. Handles nested structures with flattening options. All conversions happen locally, no data uploaded.
Christmas Countdown - Online Days Until Santa Claus
A festive countdown showing days, hours, minutes until December 25. Animated snow and music toggle. Local time.
Bohr Model Viewer - Online Atom Electron Shells
Click any element to see its Bohr model with electrons orbiting in shells. Beautiful, educational diagram.
Large CSV File Splitter - Online Break into Chunks
Split a large CSV into smaller files by row count. Preview each chunk. No upload; streamed locally.
Scale of the Universe - Online Zoom from Planck to Galaxy
Zoom through sizes from the Planck length to the observable universe. Educational and awe‑inspiring visualization.
Book Reading List - Online Track To‑Read & Finished
Add book titles and authors to a to‑read list. Move them to 'finished' and add a rating. Data saved locally.
Paper Fold Simulator - Online Virtual Origami Practice
Fold a virtual square paper step by step with crease lines and visual previews. Practice origami basics without wasting real paper. All canvas‑based.
PNG to ICO Converter - Online Favicon Maker
Convert any PNG image into a proper .ico favicon file with multiple sizes embedded. For website icons. Local.
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.
Color to CIELAB Converter - Online Perceptual Space
Convert hex or RGB to CIELAB L*a*b* values. Understand perceptual lightness and color opponents. Local math.
Mailto Link Generator - Online HTML Email Link
Build a complex mailto: link with to, cc, bcc, subject, and body. Get the HTML anchor tag. Local.
Text to ISO Date Converter - Online Parse Any Date String
Paste a human‑readable date (like 'next Friday' or 'March 5, 2023') and convert it to ISO 8601 format. Quick and tolerant.
HTML Minifier - Online Compress Web Pages
Reduce your HTML file size by stripping whitespace, comments, and optional closing tags. Secure browser‑based.
Hijri to Gregorian Date Converter - Online Islamic Calendar
Convert between Gregorian and Hijri (Islamic) dates. Approximate visual reference. Local algorithm.
Julian Date Converter - Online Calendar to JD
Convert a Gregorian calendar date to its Julian Day Number and vice versa. Used in astronomy and mainframe computing.
Date to Unix Epoch Converter - Online Human to Timestamp
Convert any human‑readable date to a Unix timestamp in seconds or milliseconds. Also shows ISO 8601. Clean interface.
Gray Code Converter - Online Binary to Reflected Code
Translate between binary and Gray code (reflected binary code). See the bit changes. Useful for digital logic.
Signed Magnitude Converter - Online Negative Binary Numbers
Encode decimal integers into signed magnitude binary representation and decode back. Learn computer arithmetic.
Decimal to IEEE 754 Converter - Online Float Representation
Convert a decimal number to 32-bit single precision IEEE 754 format. See sign, exponent, mantissa bits. Developer tool.
Roman Numeral Date Converter - Online MMXXVI Style
Convert any date into Roman numerals (day‑month‑year) for tattoos or special occasions. Clean and local.
Minutes to Decimal Hours - Online Time Conversion Tool
Convert minutes to decimal hours and vice versa. Essential for billing and payroll. Instant conversion with a handy chart.
Favicon Converter - Online Image to .ico & Multi-size
Upload a logo and generate a pack of favicon sizes plus a .ico file. All conversion in your browser.
Radiation Converter - Online Gray Rad Rem & Sievert
Convert between units of absorbed dose and equivalent dose (Gray, Rad, Rem, Sievert). Educational and reference. Local calculation.
Power Converter - Online Watt Horsepower & Kilowatt Tool
Convert power units: watt, kilowatt, horsepower, BTU/h. Quick reference for electrical and mechanical engineering. Browser-based.
Force Converter - Online Newton & Pound-Force Translator
Convert units of force: Newton, kilonewton, pound-force, dyne. Handy for physics homework and engineering. Private, no upload.
Torque Converter - Online Newton-Meter & Foot-Pound Tool
Convert torque units between Newton-meter, foot-pound, inch-pound, and more. Essential for mechanics and engineers. Instant local conversion.
Audio Converter - Online Convert WAV MP3 OGG Locally
Convert audio files between popular formats like WAV, MP3, and OGG directly in the browser. No upload, fast encoding using WebAudio and ffmpeg wasm.
Number Base Converter - Online Binary Octal Decimal Hex
Convert numbers between binary, octal, decimal, and hexadecimal bases. See real-time conversion as you type. Clean and simple programmer utility.