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

1783547102

Unix milliseconds

1783547102000

ISO 8601

2026-07-08T21:45:02.000Z

UTC

Wed, 08 Jul 2026 21:45:02 GMT

Local

7/8/2026, 9:45:02 PM

Relative

1 second ago