# Unix Timestamp Converter — Free

Convert between Unix timestamps and human dates. 100% in your browser — free, no sign-up.

## What is a Unix timestamp?

A Unix timestamp is the number of seconds (or milliseconds) since midnight UTC on 1 January 1970, called the epoch. It is a simple, timezone-free way to store a moment in time, which is why databases, logs, and APIs use it everywhere.

## How conversion works here

Enter an epoch value to see the human-readable date, or pick a date to get its timestamp. It handles both seconds and milliseconds and computes everything in your browser — nothing is uploaded.

## When to use it

Read the timestamp in a log line or API response, set an exact expiry value, debug why two times do not match, or convert a date into the epoch a system expects. It is a constant need when working with logs and APIs.

## Seconds vs milliseconds

Unix timestamps usually come in seconds (10 digits today) but many languages, including JavaScript, use milliseconds (13 digits). If a converted date looks wildly wrong, you are probably mixing the two — check the digit count.

## How to

1. Enter a Unix timestamp, or pick a date.
2. Read the converted value — it is computed in your browser.
3. Watch the seconds-vs-milliseconds unit if a result looks off.

## FAQ

**Does it handle seconds and milliseconds?**

Yes. It converts both. If a date looks wildly wrong, you are probably mixing the two — check the digit count (10 vs 13).

**Is my data uploaded?**

No. Conversions are computed in your browser, so nothing is sent anywhere.

**What is a Unix timestamp?**

The number of seconds (or milliseconds) since 1 January 1970 UTC — a simple, timezone-free way to store a moment in time.

**Can I convert a date back to a timestamp?**

Yes. Enter an epoch value to get the date, or pick a date to get its timestamp.

**Is it free?**

Yes, completely free — no sign-up and no watermark.

**Is my data private?**

Yes — this tool runs entirely in your browser. Your files and text are never uploaded.


## Related

- [Text Diff Checker — Free, In Browser](/dev/text-diff)
- [UUID Generator (v4) — Free](/dev/uuid-generator)
- [URL Encode / Decode — Free](/dev/url-encode)
- [Hash Generator (SHA-256, SHA-1, SHA-512) — Free](/dev/hash-generator)
- [Base64 Encode / Decode — Free](/dev/base64)
- [JWT Decoder — Free, In Browser](/dev/jwt-decoder)
- [JSON Formatter & Validator — Free](/dev/json-formatter)