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Browse all pages and tools on ZivoLab
Main Pages
Calculators
BMI Calculator
Calculate your Body Mass Index (BMI) and determine if you are in a healthy weight range.
Age Calculator
Calculate your exact age in years, months, weeks, and days based on your birth date.
Date Calculator
Calculate days between dates, add or subtract from a date, find the weekday, and check week numbers.
Percentage Calculator
Calculate percentages, percentage increases, and decreases.
Scientific Calculator
Calculate advanced math expressions with trigonometry, logarithms, powers, roots, constants, memory, and history.
Random Number Generator
Generate random integers or decimals with custom ranges, unique sampling, exclusions, sorting, and multiple sets.
Unit Converter
Convert length, mass, area, volume, time, temperature, speed, density, power, energy, force, pressure, storage, angle, illuminance, torque, resistance, voltage, and current.
Loan Calculator
Compare fixed-payment loans, fixed-principal loans, deferred lump-sum loans, and bond face-value maturity scenarios.
Pregnancy Calculator
Estimate due date, gestational age, trimester, and key pregnancy milestones from LMP, ultrasound, conception, IVF transfer, or an existing due date.
Games
Sudoku
Classic number puzzle game. Fill the grid so each row, column, and 3x3 box contains digits 1-9.
2048
Slide numbered tiles to combine them and reach the 2048 tile.
Snake Game
Classic snake game. Eat food to grow longer without hitting walls or yourself.
Minesweeper
Classic Minesweeper logic game. Reveal safe cells, flag hidden mines, and clear the board.
Nonogram
Solve picture logic puzzles by filling cells from row and column clues, with hints, undo, and responsive controls.
Dev Tools
JSON Formatter
Format, validate, and beautify JSON data.
Base64 Encoder/Decoder
Encode and decode Base64 data.
URL Encoder/Decoder
Encode and decode URL components, full URLs, and form values locally in your browser.
JWT Decoder
Decode JWT headers and payload claims locally in your browser.
Timestamp Converter
Show the current time and convert Unix epoch seconds or milliseconds to readable dates and back locally in your browser.
Color Converter
Convert colors between HEX, RGB, HSL, and other formats.
QR Code Generator
Generate styled QR codes for text, URLs, phone, email, SMS, and Wi-Fi locally in your browser.
UUID Generator
Generate UUID v1, v4, v6, and v7 values in bulk, then copy or download the output locally in your browser.
Password Generator
Generate secure passwords, passphrases, and PINs with adjustable character rules, bulk output, and local browser processing.