All tools

A complete index of the tools on Heron Tools, grouped by category. Everything runs entirely in your browser, with no sign-up and nothing to install. Pick a category below, or jump straight to a tool from the lists.

Calculators

53 tools

Numeric calculation for study and day-to-day work — from basic arithmetic to statistics, equations and geometry.

Convert

48 tools

Convert between units — length, weight, temperature and area, plus data sizes and specialist engineering units.

Image

31 tools

Resize, crop, compress and filter images entirely inside your browser.

Programming

81 tools

Everyday developer utilities — JSON formatting, encoding conversion, hashing, regex and more.

Money

33 tools

Loan repayments, savings growth, discounts and take-home pay — the arithmetic behind personal finance decisions.

Health

32 tools

Put your condition into numbers — BMI, metabolism, heart-rate zones, hydration and sleep.

Security

31 tools

Password generation, hashing, one-time passwords and HTTP security headers.

Text

33 tools

Count, reformat, convert and reorder text — the fiddly steps around working with writing.

Date & Time

31 tools

Date arithmetic, business days, timers and world clocks.

Music

25 tools

Tempo, pitch and acoustics calculations for playing and producing music.

Games

39 tools

Random picks and probability — wheels, dice, draws and the maths behind them.

2D Codes

34 tools

Generate and read QR codes and barcodes to their published specifications.

Life

29 tools

Cooking, DIY, gardening and moving — answers to the everyday question of "how many do I need?"