UD5 Toolkit
Number to Words Converter - Online Full English
Type a number and see its full English word representation (e.g., 123 β one hundred twentyβthree). Supports large numbers.
AllβinβOne Unit Converter - Online 20+ Categories
Length
Convert between different units of length
3.28084
Frequently Asked Questions
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.
Number to Words Converter - Online Write Out Currency
Convert a numeric amount into English words, perfect for writing checks or legal documents. Supports USD/GBP styles.
Currency Code to Symbol Converter - Online ISO 4217 Lookup
Enter a threeβletter currency code like USD or EUR and instantly see the corresponding symbol and number of decimals. Quick developer reference.
Scientific Notation Converter - Online Exponential & Decimal Swap
Convert between scientific notation (a Γ 10^n) and decimal form. Also supports engineering notation. Instant, local.
Data Storage Converter - Online Byte KB MB GB TB Tool
Convert between digital storage units: bits, bytes, kilobytes, megabytes, gigabytes, and more. Binary and decimal interpretations available. A developer must-have.
Text to Binary String - Online 0s and 1s Converter
Convert any text to a long string of binary digits. Perfect for learning binary representation. Local conversion.
Guinea Pig Age Converter - Online Cavvy Human Years Tool
Convert guinea pig age to approximate human years. Cute facts included. For guinea pig lovers. 100% local.
Resistors in Parallel Calculator - Online Multiple Branch Tool
Calculate the total resistance of up to 10 resistors in parallel. Enter values and see the combined resistance instantly. Local electronics helper.
CMYK to Pantone Converter - Online Approximate Match
Enter CMYK values and find the closest Pantone Solid Coated color. For print design reference. Clientβside lookup.
Voltage Divider Calculator - Online Two Resistor Output Tool
Calculate output voltage from a two-resistor voltage divider. Enter input voltage and resistances to see Vout. Includes circuit schematic. No data sent.
Hex to Decimal Converter - Online Base 16 to 10 Tool
Translate hexadecimal numbers to decimal integers. Instantly see the magnitude. A simple, private utility for developers and mathematicians.
HMAC Generator - Online SHAβ256/512 Message Authentication
Create an HMAC (Hashβbased Message Authentication Code) using SHAβ256 or SHAβ512 with a secret key. Verify data integrity. Local.
Email Permutator - Online Generate All Possible Addresses
Enter a first name and last name, plus a domain, to generate common email address patterns. For finding contacts.
Polygon Area Calculator - Online Irregular Shape Tool
Calculate the area of an irregular polygon by entering its vertex coordinates. Uses the shoelace formula. Pure math.
Love Calculator - Online Fun Romance Compatibility Test
Enter two names and get a playful love compatibility percentage. Purely for entertainment! All calculation happens instantly in your browser.
Eye Prescription Converter - Glasses to Contact Lens Rx Tool
Approximate conversion from eyeglass prescription to contact lens power. Uses vertex distance formula. For educational purposes only, consult your optometrist.
Split Payment Calculator - Online Divide Bill with Fees & Tax
Divide a total bill among multiple people considering tax and service fees. See exactly who pays what.
Card Deck Probability Calculator - Online Poker & Draw
Calculate odds of drawing specific cards or poker hands from a standard deck. Learn combinations. Local math.
Web Share Level 2 Tester - Online Share Files
Test sharing multiple files (images, PDFs) using the Web Share API. Check if the browser supports file sharing. Demo page.
Epoxy Resin Mix Calculator - Online Part A & B by Volume/Weight
Calculate how much resin part A and part B to measure for a given total volume. Common ratios (2:1, 1:1). Avoid sticky failures. Local.
Multi Dice Roller - Online 3D Animated Dice
Roll virtual dice with animated 3D spins. Choose any number and type. See total and individual results. Fun for games.
Gamma Function Calculator - Online Advanced Factorial
Evaluate the Gamma function for real and complex inputs (real part). Extension of factorial. Academic mathematics tool.
Multiplication Grid Challenge β Online Fill the Times Table
Complete a 10x10 multiplication grid against the clock. A fun way to master times tables.
Math Worksheet Generator - Online Printable Drills for Kids
Generate printable math worksheets for addition, subtraction, multiplication, and division. Choose difficulty and number of problems. Answer key included.
Final Exam Grade Calculator - Online What You Need to Score
Determine what score you need on your final exam to achieve your target overall grade. Enter current grade, weight, desired grade. Local only.
Probability Calculator - Online Odds & Combinatorics Tool
Compute probability for simple events, as well as permutations and combinations (nPr, nCr). Useful for statistics and game theory. Browser-based math.
Language Cheat Sheet Generator - Online Phrase Card for Travel
Select a destination language and generate a printable mini phrasebook with essential greetings, directions, food, and emergency phrases. Local only.
Memory Card Matching Game - Online Flip & Find Pairs
Classic memory card game with emoji or color themes. Select grid size and try to find all pairs in minimum moves. Brain training fun.
Speaker Placement Calculator - Online Home Theater Stereo Angle
Calculate ideal stereo speaker placement (toe-in, distance from wall) for best soundstage. Visual diagram. For audiophiles. Local tool.