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Create custom QR codes from any URL or text.
Decode QR codes from images or your camera.
Generate strong, secure passwords instantly.
Open and view Word, Excel, PDF, TXT, Markdown and CSV files instantly in your browser. No upload, no account, no download required.
Shorten any URL and generate a QR code for it instantly.
Tell us how many minutes you have free — we'll tell you exactly what to do.
Find the best time to wake up or go to sleep based on sleep cycles.
Calculate tips and split bills instantly.
Estimate your annual US federal income tax, effective rate, and refund or amount owed.
Calculate your monthly student loan payment, total interest, and payoff date. Compare Standard, Graduated, and Income-Driven Repayment plans side by side.
Calculate sale price after discount, find the discount percentage, or work out the original price — plus stack two discounts at once.
Find out how long it will take to pay off your credit card balance, how much interest you'll pay, and compare minimum payment vs fixed payment strategies.
Calculate percentages, percentage change, and percentage increase or decrease instantly.
Calculate your GPA from letter or percentage grades, and find out what GPA you need to hit your target.
Calculate gross margin, markup and profit from cost and revenue.
Calculate your Body Mass Index and healthy weight range.
Calculate your exact age in years, months and days.
Explore and listen to live radio stations from around the world on an interactive map.
Test your internet download, upload, ping and jitter speeds instantly.
Look up any IP address to see its country, city, ISP, timezone and coordinates.
Check whether a port is open on any host. Quick test for common ports right in your browser.
Check if WebRTC is leaking your real IP address behind a VPN.
Check your public IP, detected country and ISP — and compare with your expected VPN location.
Generate Ed25519 or RSA SSH key pairs entirely in your browser — no backend, no uploads.
Build school timetables in 10 languages, with logo, classes, teachers, and PDF/Excel export.
Check live weather for any city — current conditions, 24-hour forecast, 7-day outlook, UV index, air quality, sunrise and sunset times. Free, no signup.
Find public holidays for any country instantly.
Explore facts and data for every country in the world.
Convert time between any two cities instantly. Live world clock for 90+ cities, meeting planner for remote teams, and specific time converter. Free, no signup.
Convert between 170+ currencies with live exchange rates.
Mix chemical elements and discover real or imaginary compounds in your personal virtual lab.
Calculate monthly payments, total interest and amortization for any loan.
Calculate Equated Monthly Installment for personal, home and vehicle loans.
Calculate mortgage payments with PITI: principal, interest, tax, insurance and PMI.
Calculate auto loan payments including sales tax, down payment and trade-in value.
Calculate how your investment grows over time with compound interest and monthly contributions.
Estimate US take-home pay after federal tax, state tax, FICA and pre-tax deductions.
Estimate life insurance coverage needs and car insurance premiums — no signup, no email.
Compare debt snowball vs avalanche side by side. Enter your debts and see months to debt-free, total interest, and interest saved.
Find your breakeven year for buying vs renting. Full cost of ownership, opportunity cost of the down payment, and interactive assumptions.
Project your 401(k) at retirement as a conservative-to-optimistic range with real tiered employer match and inflation-adjusted values. No signup.
Pick, convert, and generate color palettes. Supports HEX, RGB, HSL, HSB, CMYK. Includes harmony generator, contrast checker, gradient builder, and image color extractor.
Convert between Bitcoin, Satoshi, mBTC, bits, USD, EUR and MAD instantly. Live BTC price updated every 60 seconds.
Convert length, weight, temperature, area, volume, speed, time, data, pressure and energy units instantly.
Calculate your daily calorie needs and macros based on your age, weight, height, and activity level.
Create professional invoices in seconds. Live preview, 3 templates, multi-currency, logo upload, and instant PDF download. 100% free and private.
Calculate your personalized daily water intake. Interactive glass tracker with sound effects and smart hydration schedule.
Find out how far along you are, your due date, and what's happening with your baby this week. Week-by-week development guide with baby size, milestones and key dates.
Free scientifically-grounded Big Five (OCEAN) personality quiz — 50 IPIP-based questions, full results shown immediately, no signup, no paywall, no email.
Free 28-question attachment style test scored on two dimensions — anxiety and avoidance. Secure, anxious, avoidant or fearful-avoidant, full results instantly, no signup.
Calculate your maximum heart rate and 5 training zones using Tanaka, Fox, Gulati, Nes or the Karvonen (HRR) method. Free, private, runs in your browser.
Find your ideal fasting schedule with a 4-question quiz. Live countdown timer, 6 proven protocols (12:12 to OMAD), and personalized daily eating window.
Free macro calculator with a complete protein / carb / fat breakdown for cutting, maintenance and lean bulking. Protein-first (g/kg) approach, Mifflin-St Jeor and Katch-McArdle formulas, no signup.
