Calculators and developer tools
What you enter is calculated on this device. No install and no sign-up.
Calculators
- $Currency ConverterConvert between more than 150 currencies, such as USD, EUR, KRW and JPY, using daily exchange rates.
- mLength ConverterConvert between units of length such as metres, kilometres, miles, feet and inches.
- kgWeight ConverterConvert between units of weight such as kilograms, grams, pounds, ounces and tonnes.
- °CTemperature ConverterConvert between Celsius (°C), Fahrenheit (°F) and Kelvin (K).
- ㎡Area ConverterConvert between units of area such as square metres, pyeong, acres and square feet.
- km/hSpeed ConverterConvert between units of speed such as km/h, m/s, mph and knots.
- GBData Size ConverterConvert between data sizes such as bytes, KB, MB, GB, TB and KiB, MiB, GiB.
- MbpsMbps ↔ MB/s ConverterConvert internet speed in Mbps to download speed in MB/s and back. 1 MB/s is 8 Mbps.
- D-dayDate CalculatorCount the days between two dates, or find the date a number of days before or after a given day.
- ageAge CalculatorWork out your age from a date of birth in three ways (international, year age and traditional Korean age), with exact years, months and days and the days until the next birthday.
- %Loan CalculatorCalculate the monthly payment, total interest and repayment schedule for equal-payment, equal-principal and bullet loans.
- +%Compound Interest CalculatorCalculate the final amount and interest from a starting sum, monthly deposits and an annual rate, with compounding.
- %Percentage CalculatorFind a percentage of a number, what percent one number is of another, and the percent change between two numbers.
Developer tools
- {}JSON Formatter & ValidatorPretty-print or minify JSON and find the exact position of a syntax error.
- B64Base64 Encoder & DecoderEncode text to Base64 or decode Base64 back to text, with full UTF-8 support.
- %20URL Encoder & DecoderPercent-encode text for use in a URL, or decode %XX sequences back to text.
- IDUUID GeneratorGenerate random (v4) UUIDs, many at a time, with options for uppercase and hyphens.
- #Hash Generator (SHA-256)Calculate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or a file. Files never leave your device.
- TSUnix Timestamp ConverterConvert Unix timestamps (seconds or milliseconds) to dates and back, and see the current time at a glance.
- JWTJWT DecoderDecode the header and payload of a JWT and check its expiry time. The signature is not verified.
- .*Regex TesterType a regular expression and see the matches in your text highlighted instantly, with capture groups listed.
- RGBColor Converter (HEX, RGB, HSL)Convert colour codes between HEX, RGB and HSL, and pick a colour with the colour picker.
- ***Password GeneratorPick a length and character types to create random passwords. They are made in your browser and never stored.
Text tools
- AaWord & Character CounterCount characters (with and without spaces), words, lines and bytes, and estimate the reading time.
- aACase ConverterChange text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case and more.
- ±Text Diff CheckerCompare two texts line by line and highlight the added and removed lines.
- ≡Line ToolsRemove duplicate lines, sort, drop empty lines, trim whitespace and reverse the order of lines.