Leap Year Checker
Check if a year is a leap year and find upcoming ones
100% private. Your files and inputs never leave your device — everything runs locally in your browser.
How to Use Leap Year Checker
Check if a year is a leap year and find upcoming ones. No signup, no uploads, no watermarks.
- 1
Enter your numbers in the input fields.
- 2
Choose the calculation options or frequency.
- 3
The result updates instantly as you type.
- 4
Review the breakdown, chart, or schedule, and copy the answer.
Why choose Leap Year Checker?
- No uploads — your files never leave your device.
- Free forever with no signup, no watermarks, and no limits.
- Works on any device with a modern browser — no installs.
- Fast, private, and built for getting the job done in seconds.
Frequently Asked Questions
Why are century years special?▾
A century year like 1900 is divisible by 100 but not by 400, so it is not a leap year. 2000 is divisible by 400 and is a leap year.
Why do we need leap years?▾
A solar year is about 365.2422 days. Adding a day every four years (with the century rule) keeps the calendar aligned with the seasons.
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