100+ tiny tools that just work
No accounts, no upsell, no clutter — just a tidy little zoo of utilities.
Pick your enclosure
Pastel and tidy. Each card opens a list of tools — no logins, no ads, no nonsense.
Calculators
Tip, mortgage, time zones, percentages, dates and beyond.
Dev Tools
JWT, JSON, base64, regex tester, hash, cron parsing.
Generators
UUIDs, lorem ipsum, fake data, names, gradients — instantly.
Text & Writing
category.text.description
Video & Audio
Trim, transcode, extract audio — powered by WebCodecs.
9 tools, in one wall
Hover anything for a name. Click for the tool.
Trending this week
What people opened most in the last seven days.
Age Calculator — How old am I?
Calculators
Calculate your exact age in years, days, hours and seconds. Zodiac sign, Chinese zodiac, days until your next birthday and life milestones.
Body Composition Calculator — BMI, Body Fat & Calories
Calculators
Calculate BMI, waist-to-height ratio, body fat %, lean mass, BMR and TDEE. Get personalized calorie targets and macro breakdown for your goal.
JSON Formatter & Validator
Dev Tools
Format, minify, and validate JSON online.
QR Code Generator online
Generators
Generate QR codes from text or URLs. Customize size, colors, and error correction. Download as PNG.
Wallpaper Calculator
Calculators
Calculate exactly how many wallpaper rolls you need. Interactive room editor with walls, windows, doors, and radiators.
Got a tool you wish existed?
Tell us. Most tools on Zootool started as a one-line note from someone like you.