Is it safe to use the Timestamp Converter online?

Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.

Are my files uploaded to a server?

No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.

Do I need to sign up or pay?

No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.

How does it auto-detect seconds vs milliseconds?

Numbers below ~10^11 are treated as seconds. Above that, as milliseconds. The threshold corresponds to year ~5138 in seconds, so the heuristic is unambiguous in practice.

What about timezones?

Both UTC and local-time ISO strings are shown. Browser timezone is used for the local one.

Unix Timestamp Converter

Convert Unix epoch timestamps to ISO and local dates — and back. Auto-detects whether your input is seconds or milliseconds based on magnitude.

Features

Accepts seconds, milliseconds, or any parseable date string
Auto-detects the unit
Outputs Unix seconds, Unix ms, ISO 8601 (UTC), ISO 8601 (local), human date, relative time
"Use current time" shortcut
Copy any field

How to unix timestamp converter

Paste timestamp or date — Any of: 1234567890, 1234567890000, 2026-04-26T20:00:00Z, April 26 2026 8pm.
Read conversions — All formats are listed below the input.

Frequently asked questions

Is it safe to use the Timestamp Converter online?: Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.
Are my files uploaded to a server?: No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.
Do I need to sign up or pay?: No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.
How does it auto-detect seconds vs milliseconds?: Numbers below ~10^11 are treated as seconds. Above that, as milliseconds. The threshold corresponds to year ~5138 in seconds, so the heuristic is unambiguous in practice.
What about timezones?: Both UTC and local-time ISO strings are shown. Browser timezone is used for the local one.