Free Utility Tools Online
QR code generator, BMI calculator, unit converter, password generator, age calculator, and percentage calculator — all free, all in your browser.
25 Tools
QR Code Generator
Generate QR codes for URLs, text, email, and phone numbers.
Utility
Unit Converter
Convert length, weight, temperature, and speed units.
Utility
Password Generator
Generate strong, random passwords securely.
Security
Pomodoro Timer
Focus timer with 25-minute work and 5-minute break sessions.
Utility
Aspect Ratio Calculator
Calculate aspect ratio and resize dimensions proportionally.
Utility
BMI with Body Fat
Combined BMI calculator and body fat percentage estimator.
Utility
Pack Weight Calculator
Estimate travel packing weight with airline limits.
Utility
Random Decision Maker
Spin the wheel to make random decisions.
Utility
Habit Tracker
Track daily habits with streak counting.
Utility
Screen Ruler
Measure pixels on screen with a draggable ruler.
Utility
World Clock
View live clocks for multiple cities worldwide.
Utility
File Size Converter
Convert between bytes, KB, MB, GB, and TB.
Utility
Timezone Converter
Convert time between world timezones instantly.
Utility
Date Calculator
Calculate days between dates or countdown to a date.
Utility
Binary Converter
Convert between text, binary, decimal, and hex.
Utility
Roman Numeral Converter
Convert numbers to Roman numerals and back.
Utility
Screen Resolution Checker
View your screen size, viewport, and device pixel ratio.
Utility
IP Address Lookup
Find your public IP address and location info.
Utility
Recipe Scaler
Scale recipe ingredients up or down.
Utility
Book Reading Tracker
Track books you are reading with progress and notes.
Utility
Movie Watchlist
Manage your movie watchlist with ratings.
Utility
Password Strength Tester
Test password strength and get improvement suggestions.
Utility
Unit Price Comparator
Compare unit prices to find the best deal.
Utility
Age in Different Units
Convert age into different time units.
Utility
Random Quote Generator
Generate random inspirational quotes.
Utility
Aadhaar Format Checker
Validate Aadhaar number format and Verhoeff checksum.
Validator
Land Unit Converter
Convert between Indian land units (Bigha, Guntha, Katha).
Converter
Premium Due Reminder
Generate printable insurance premium due date reminders.
Reminder
EMI Due Reminder
Generate printable EMI due date reminder cards.
Reminder
Renewal Reminder
Generate printable insurance/RC renewal reminders.
Reminder
About Utility Tools
OptiDrop's utility tools cover everyday tasks that don't fit into a single category. Generate QR codes for your website or business card, calculate your BMI to track health goals, convert between metric and imperial units, create cryptographically secure passwords, calculate exact age for official forms, and solve percentage problems instantly.
All utility tools are free, require no sign-up, and run entirely in your browser.
Frequently Asked Questions
Yes. All utility tools on OptiDrop are completely free with no hidden fees, no sign-up walls, and no usage limits.
Yes. The password generator uses the Web Crypto API for cryptographically secure random generation. The passwords are safe for real-world use.
You can download QR codes as PNG or SVG files. Both formats are high quality and suitable for printing or digital use.
The unit converter supports length, weight, temperature, and speed conversions between metric and imperial systems. Common units like km/miles, kg/lbs, Celsius/Fahrenheit are all supported.
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Last updated: June 2026