Fast, free online converters & calculators
Convert length, mass, volume, temperature, speed, time, data size, and more — instant, accurate, and running entirely in your browser. No sign-up, no waiting.
Notepad Calculator
Open the notepad →A notepad that does the math. Every line is answered live — arithmetic, named variables, conversions, percentages, and time zones — with running subtotals. Runs entirely in your browser; nothing you type is sent anywhere.
Browse by category
Speed
- Kilometers per hour to Miles per hour
- Kilometers per hour to Meters per second
- Kilometers per hour to Knots
- Kilometers per hour to Feet per second
Area
- Square meters to Square feet
- Square meters to Acres
- Square meters to Hectares
- Square meters to Square miles
Calculators
All calculators →BMI Calculator
Work out your Body Mass Index from your height and weight, in metric or US units, with the standard category.
Tip Calculator
Add a tip to a restaurant bill and split the total evenly between any number of people.
Discount Calculator
Find the sale price and how much you save when a percentage is taken off the original price.
Percentage Calculator
Answer the three everyday percentage questions: what is X% of a number, X is what percent of Y, and the percent change from one number to another.
Loan & Mortgage Calculator
Work out the monthly payment on a loan or mortgage, plus the total interest, total paid, and a full year-by-year amortization schedule.
Date Difference & Age Calculator
Find the time between two dates — in years, months, and days, plus the total days and weeks. Doubles as an age calculator: enter a birth date and today.
Unit Price Comparison Calculator
Compare two package sizes or prices to see which is the better deal per unit — the classic 'is the bigger box actually cheaper?' check.
Salary & Pay-Rate Converter
Convert any pay rate between hourly, daily, weekly, bi-weekly, monthly, and yearly — in both directions — with optional take-home pay and a multi-year projection.
Time zone converters
All timezones →Generators
All generators →Password Generator
Create a strong, random password or a memorable passphrase — generated securely in your browser and never sent anywhere.
UUID Generator
Generate RFC 4122 UUIDs — random v4 or time-ordered v7 — one at a time or in bulk, entirely in your browser.
PIN Generator
Generate a random numeric PIN of any length — for cards, locks, or codes — created securely in your browser.
Image Tools
All image tools →Image Editor
Crop, blur out a face, draw arrows and boxes, add a caption, cut out a region, and set a background — then save a PNG or JPG. All in your browser; nothing uploaded.
Image Compressor
Shrink an image's file size in your browser — nothing is uploaded. Choose a quality, or set a target size (e.g. under 1 MB) and download the result.
Image Resizer
Resize an image by pixels or percentage in your browser — nothing is uploaded. Lock the aspect ratio to keep it from stretching.
Background Remover
Remove a solid-color background — white, a plain wall, a green screen — and download a transparent PNG, all in your browser. Built for flat-color backgrounds, not busy photos. Nothing is uploaded.
PNG to JPG Converter
Convert PNG images to JPG in your browser — nothing is uploaded. Instant and free.
PNG to WebP Converter
Convert PNG images to WebP in your browser — nothing is uploaded. Instant and free.
JPG to PNG Converter
Convert JPG images to PNG in your browser — nothing is uploaded. Instant and free.