Leap Year Checker
Check if any year is a leap year
Leap Year Checker is a free online tool from BrowserUtils that check if any year is a leap year. It runs entirely in your browser — your data never leaves your device. No account required.
2026
is NOT a Leap Year
28
Days in Feb
365
Days in Year
2024
Prev Leap
2028
Next Leap
Nearby Years
2020202120222023202420252026202720282029203020312032
How to use Leap Year Checker
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About Leap Year Checker
Free online leap year checker. Determine if any year is a leap year, and find the next and previous leap years. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
Leap Year Checker specs
- Runtime
- 100% client-side (browser)
- Built on
- Native Date and Intl.DateTimeFormat APIs with full IANA timezone database support
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What makes a year a leap year?
A year is a leap year if it is divisible by 4, except for century years which must also be divisible by 400. So 2000 was a leap year, but 1900 was not.
How often do leap years occur?
Leap years occur roughly every 4 years. The Gregorian calendar has 97 leap years every 400 years.
Is 2100 a leap year?
No. While 2100 is divisible by 4, it is a century year not divisible by 400, so it is not a leap year. The next century leap year after 2000 will be 2400.
Why do we have leap years?
Earth takes approximately 365.2422 days to orbit the sun. Without the extra day every four years, the calendar would drift by about 24 days per century, eventually shifting seasons away from their expected months.
Does the leap year checker work offline?
Yes. The check is a simple divisibility calculation that runs in your browser. No server connection is required.
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