Free online tools: calculators, generators, formatters

Small tools that each do one job well: budget calculators, random number and UUID generators, a password generator and a JSON formatter. No sign-up, everything runs in your browser.

Calculators

Calculator

Savings rate calculator

• What share of income do I keep?
• How long until I reach my goal?
• How much will I set aside over any period?
• How much can I spend and still reach my goal?

Randomizers

Randomizer

Random number generator

• How do I pick a random number between two values?
• Can I draw several numbers without repeats?
• How do I leave certain numbers out of the draw?

Randomizer

UUID generator

• What does a UUID look like?
• How do I get a batch of UUIDs at once?
• Can two random UUIDs collide?

Prettifiers

Prettifier

JSON formatter

• How do I make minified JSON readable?
• Can I choose the indent size?
• Where exactly is my JSON invalid?

Generators

Generator

Password generator

• Which characters should a password include?
• How long would it take to crack by brute force?
• How long is long enough?

Try Qoin

Log expenses, set budgets and see the charts on a ready-made demo account. No sign-up.

Open demo