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.

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

Unix seconds

1791866678

Unix milliseconds

1791866678000

ISO 8601

2026-10-13T04:44:38.000Z

UTC

Tue, 13 Oct 2026 04:44:38 GMT

Local

10/13/2026, 4:44:38 AM

Relative

now