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

1791936423

Unix milliseconds

1791936423000

ISO 8601

2026-10-14T00:07:03.000Z

UTC

Wed, 14 Oct 2026 00:07:03 GMT

Local

10/14/2026, 12:07:03 AM

Relative

now