◷Free
Leap year checker
Check the proleptic Gregorian century and 400-year leap rules.
A year is leap when divisible by four, except century years must also be divisible by 400. The year 2000 is leap with 366 total days and 29 days in February; 1900 is not.
How to use
- Enter your text, values, or image.
- Adjust the options and run the tool.
- Copy or download your result.
Worked example
Example input
Year: 2000
Example result
{
"year": 2000,
"isLeapYear": true,
"daysInYear": 366,
"februaryDays": 29
}Limitations and details
Only whole years 1–9999 are accepted; Gregorian rules are extended backward and do not reproduce historical calendar adoption dates.
Inputs and options
- Year
- Number · Minimum: 1 · Maximum: 9999
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.