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Money Play · Korean beta
Pour and tidy banknotes, or try bundling exactly ₩1 million. The game currently uses Korean.
Play now →Myeongnyang Defense · Korean beta
Build and upgrade your fleet through 30 waves. Unlock flagships and ramming turtle ships. The game currently uses Korean.
Play now →Categories
6 of them
Documents
Make something and print it
Paper you print to write on, PDFs to merge or split, images to convert, and a photo turned into a knitting chart. Everything is laid out for A4 and nothing is uploaded.
- Printable paper
- PDF and image tools
- Knitting and crochet charts
19 tools →
Retirement
What you need, and how long it lasts
Set a retirement target, then carry that same number through saving and drawing it down. Compound interest and the 4% rule sit alongside, so the assumptions stay in one place.
- Retirement target
- Compounding · 4% rule
- Drawdown that lasts
8 tools →
Countries by the numbers
How countries compare
Population, economy size and income per person, country by country, from World Bank figures. Sort the table, or find one country and see where it sits.
- Population
- GDP and GDP per capita
- Adjusted for prices (PPP)
4 tools →
Dev tools
Small tools for everyday development
Formatters for JSON, SQL, JS and CSS, plus Base64, JWT, hashes, UUIDs, regular expressions and cron — the things you need for a minute in the middle of something else.
- Formatters and minifiers
- Encoding, hashes, UUIDs
- Regex, cron, diff
24 tools →
Everyday
The small sums you keep redoing
What percentage that is, how many days left, what the loan costs, what time it is there — the sums that never quite justify opening a calculator but catch you out every time.
- A plain calculator
- Units, percentages, dates
- Loans, fuel, time zones
24 tools →
Games
One round, nothing to install
Sudoku, minesweeper, 2048 and the rest, played straight in the browser. Nothing to download, no account, and your records stay on this device.
- Six puzzles
- Brick breaker and snake
- Typing and reaction
14 tools →
All tools
93 tools
🌐 Every tool listed here gives the same answer wherever you are.
Documents19 tools
- Document editor🌐Write in the browser, laid out for A4
- Merge PDFs🌐Several PDFs into one file
- Split PDF pages🌐Drop pages you don't need, or pull some out
- Extract images🌐Pull pictures out of a PDF or HWP
- Convert images🌐Resize and convert to JPG·PNG·WebP
- Make a GIF🌐Turn photos or video into a moving picture
- Knitting pattern converter🌐A photo becomes a knitting chart
- Crochet symbol chart🌐Draw a chart by placing symbols
- Build a screen🌐String pages together into a display board
- Play a screen🌐Run it on a TV or tablet
- My screens🌐Screens you have built
- Ruled paper🌐Line spacing 7–10mm, ready to print
- Grid paper🌐3·5·10mm squares, ready to print
- Dot paper🌐Dot grid at 5·7·10mm
- Staff paper🌐Blank music staves to print
- Arithmetic worksheets🌐Problem sheets with an answer key
- Timetable🌐School or class timetable to print
- Circular timetable🌐A day drawn as a circle
- Character count🌐Count with and without spaces
Retirement8 tools
- Retirement target🌐How much you need before you can stop
- Saving for retirement🌐How much to put away each month
- Drawing it down🌐How many years it lasts once you start spending
- The 4% rule🌐Retirement savings seen through a safe withdrawal rate
- Compound interest🌐What it becomes once time is added
- Rule of 72🌐How long until the money doubles
- Reinvesting dividends🌐What happens when dividends go back in
- Kelly criterion🌐How much of the pot to stake
Countries by the numbers4 tools
Dev tools24 tools
- JSON formatter🌐Format, validate, minify
- SQL formatter🌐Line a query up
- JS formatter🌐Format and minify JavaScript
- CSS formatter🌐Format and minify stylesheets
- Markdown🌐Strip the asterisks and backticks to plain text
- Base64🌐Encode and decode
- URL encoding🌐Percent-encode and back
- JWT🌐Take a token apart
- Hash🌐MD5 and SHA
- UUID🌐UUID v4·v7 and short IDs
- Secret key🌐A safe random string
- Regular expressions🌐Match as you type
- cron🌐Read a schedule out in words
- Diff🌐Compare two texts line by line
- Timestamp🌐Unix time ↔ date
- Colour🌐HEX·RGB·HSL and contrast
- Number base converter🌐Binary, octal, decimal, hex and any base
- Subnet calculator🌐A CIDR block into range, mask and host count
- Favicon🌐Make a favicon from an image
- JSON → TS🌐Derive types from a JSON sample
- Token count🌐Tokens and a cost estimate
- Prompt template🌐Fill the blanks with values
- Function-call schema🌐Build a schema from a sample JSON
- Secret scan🌐Sweep for keys and personal data before pasting into an AI
Everyday24 tools
- Calculator🌐Type the whole expression, precedence and all
- Random picker🌐Pick one of your options at random
- Percentage calculator🌐What percent it is, and how much it changed
- Unit converter🌐Length, weight, area, volume, temperature, speed
- Date calculator🌐Days until, days since, D-day
- Loan repayment calculator🌐Equal payment, equal principal, grace period
- Split the bill🌐Each share, and what is left over
- Fuel cost calculator🌐What the petrol for this trip costs
- World clock and time zones🌐What time it is there, and when to call
- BMI and reference weight🌐Body mass index, and weights at each cut-off
- BMR and TDEE calculator🌐Resting burn, and what a day actually costs
- Body fat calculator🌐The US Navy tape method — no calipers
- Target heart rate calculator🌐Maximum heart rate and Karvonen zones
- Waist ratio calculator🌐Waist-to-hip and waist-to-height together
- Child height predictor🌐Mid-parental height, and how wide the range is
- Macro calculator🌐Split a day's calories into carbs, protein and fat
- Due date calculator🌐Naegele's rule with gestational age and the term window
- Milestone date calculator🌐Day 100, day 1000, and what day you are on
- GCD and LCM calculator🌐Prime factors, divisors and primality in one place
- Permutation and combination calculator🌐nPr, nCr, repetition, and the probability that follows
- Mean and standard deviation calculator🌐Median, mode, quartiles and outliers too
- Quadratic equation solver🌐Discriminant, roots and the vertex
- Ohm's law calculator🌐Any two of voltage, current, resistance and power
- Transfer time calculator🌐How long a file takes on a given connection
Games14 tools
- 2048🌐Slide matching numbers together to reach 2048
- Reaction time test🌐Click the moment it turns green
- Do not press the button🌐A forbidden button tests your patience
- Bulls and Cows🌐Deduce the hidden number from bulls and cows
- 15 puzzle🌐Slide the tiles back into order
- Minesweeper🌐Read the numbers, find every mine
- Sudoku🌐A fresh puzzle at the difficulty you pick
- Tower of Hanoi🌐Move the disks — and see the fewest moves possible
- Matching pairs🌐Flip two cards and find the matching picture
- Typing practice🌐Type straight away and measure speed and accuracy
- Brick breaker🌐Bounce the ball off the bat and clear every brick
- Snake🌐Eat, grow longer, and stay out of your own way
- Click speed🌐How many clicks you land in the time given
- Bisect🌐Split a shape into two equal halves with one line