A Unix timestamp (also called Epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC (the Unix epoch). It's a simple integer that represents any moment in time, regardless of timezones or date formats.

Unix timestamps are used extensively in computer systems, databases, APIs, log files, and debugging. When you see a value like 1751246400 in a database row or an API response, it's a Unix timestamp. This tool lets you instantly decode it or convert a human date into a timestamp — all client-side, nothing leaves your browser.