Free developer tools

110 quick tools for code, data, images, PDFs and more. They run in your browser, so your files and text stay on your device.

10 tools

Convert length, weight, temperature, volume, area, speed, time and data units.

Convert between bytes, KB/KiB, MB/MiB and more, and estimate download time at any speed.

Convert Unix timestamps (seconds or ms) to dates and back, across time zones and formats.

Find an exact age in years, months and days, plus a next-birthday countdown.

Calculate Body Mass Index in metric or imperial units and see the healthy weight range.

Project investment growth with compounding and monthly contributions, year by year.

Count days between dates (including business days) or add and subtract time from a date.

Work out the monthly payment, total interest and full amortization schedule of a loan.

Solve every percentage question: X% of Y, percent change, increase, decrease and more.

Calculate the tip and split the bill between any number of people.