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Kilograms to Pounds Converter
kg, lbs, grams, ounces and stones in one place
Converters
Date Difference Calculator
Years, months, days and weeks between two dates
Date & Time
Mortgage Calculator
Monthly payment, total interest and payoff for a home loan
Finance
Word Counter
Words, characters, sentences and reading time
Text Tools
Image Compressor
Shrink JPG, PNG and WebP files without uploads
Image Tools
QR Code Generator
Websites, text, WiFi and phone numbers
Image Tools
AI Writing Detector
Check how "AI-flavored" your writing sounds
AI Tools
BMI Calculator
Body mass index with your healthy weight range
Health
Tip Calculator
Tip 15–25%, split the bill, round up per person
Finance
Age Calculator
Exact age in years, months and days, plus star sign
Date & Time
Discount Calculator
Sale price, savings, and stacked discount reality
Finance
Time Zone Converter
Beijing, New York, London, Tokyo and 11 more cities
Date & Time
About 1234 Tools
1234 Tools is a free collection of 39 online tools covering unit converters, date calculators, finance calculators, text tools, image tools, AI utilities and health calculators — each with a practical guide and FAQ. Everything runs locally in your browser: no signup, no uploads, no popups, and it works great on mobile and desktop. New tools are added regularly.