Is Timestamp Converter free?

Yes, Timestamp Converter is completely free to use with no signup required.

Does Timestamp Converter send my data to a server?

No. Timestamp Converter runs entirely in your browser using client-side JavaScript. Your data never leaves your device.

Convert Unix timestamps in seconds or milliseconds to ISO, UTC, local, and relative time, entirely in your browser.

DevTab

Never leaves your browser

Convert Unix timestamps (seconds/ms) to ISO, UTC, local, and relative time — and back.

Unix seconds

1791939520

Unix milliseconds

1791939520000

ISO 8601

2026-10-14T00:58:40.000Z

UTC

Wed, 14 Oct 2026 00:58:40 GMT

Local

10/14/2026, 12:58:40 AM

Relative

1 second ago