Free online tools that just work

Work out percentages three ways: a percent of a number, what percent one value is of another, and the percentage change between two numbers.

Paste or type text to count words, characters, sentences, and paragraphs in real time, with an estimate of reading and speaking time.

Convert kilograms to pounds and back. Type in either box for an instant result, and use the table for common values at a glance.

Calculate your Body Mass Index (BMI) in metric or imperial units and see which World Health Organization weight category it falls into.

Paste JSON to pretty-print it, validate it, or minify it. Errors are reported with a clear message so you can find the problem fast.

Generate strong, random passwords with the character types and length you choose. They’re created with cryptographically secure randomness and never leave your browser.

See how an amount grows over time with compound interest, including optional regular contributions. The result separates your deposits from the interest earned.

Find your exact age in years, months, and days from a date of birth, plus your total age in days and a countdown to your next birthday.

Convert temperatures between Celsius and Fahrenheit. Type in either box for an instant result, and check the table for everyday reference points.

Turn a link or any text into a QR code and download it as a PNG. It’s generated in your browser — your data is never uploaded — and there’s no watermark.

Generate random numbers within a range you set. Choose how many to draw, whether to allow duplicates, and whether to sort the results.

Estimate the monthly payment on a fixed-rate loan, plus the total you’ll pay and how much of that is interest. Works for auto loans, personal loans, and mortgages.