Is the Unix Timestamp Converter free?

Yes. Every VersaTools tool is completely free — no account, no watermark, and no sign-up required.

Is anything sent to a server?

No. All date math runs locally in your browser using the built-in Date API, so nothing you enter is uploaded.

What is a Unix timestamp?

It is the number of seconds that have elapsed since 1 January 1970 at 00:00 UTC, known as the Unix epoch. Many systems store it in milliseconds instead, which is 1000 times larger.

How does it know seconds versus milliseconds?

It counts the digits. A value with 13 or more digits is interpreted as milliseconds; anything shorter is treated as seconds. This matches typical present-day timestamps.

Which timezone does the date picker use?

The date and time you pick are interpreted in your device's local timezone, while the UTC and ISO outputs show the same moment in Coordinated Universal Time.

Unix Timestamp Converter

Time & Navigation

Convert between Unix timestamps and human-readable dates.

Convert both ways between Unix time and a calendar date.

Unix timestamp → date

Unix timestamp (seconds, or ms if 13+ digits)

Enter a timestamp to convert.

Date → Unix timestamp

Date & time (your local timezone)

Pick a date and time to convert.

Unix time counts seconds since 1 January 1970 UTC (the epoch). All conversions run in your browser.

Tool Overview & Guide

What is Unix Timestamp Converter?

Unix Timestamp Converter translates Unix time to and from human-readable dates, both ways. Type a timestamp to see the local time, UTC, ISO 8601, and a relative description, or pick a date and time to get the epoch value in seconds and milliseconds. It auto-detects whether your number is in seconds or milliseconds and includes a Now button for the current time. Everything runs in your browser — nothing is uploaded.

Technical Specifications & Supported Formats

Processing Engine:Client-side Native JavaScript & WebAssembly

Privacy & Security:100% In-Browser (Zero File Upload)

Supported Formats:All Standard Formats & Code Text

Max File Limit:100 MB

How to use Unix Timestamp Converter

3 simple steps to complete your task directly in your browser:

Convert a timestamp
Type or paste a Unix timestamp into the left field. If it has 13 or more digits it is read as milliseconds; otherwise it is treated as seconds.
Read the date breakdown
The tool shows the moment in your local time, UTC, ISO 8601 format, and as a relative phrase like "in 3 days" or "2 hours ago".
Convert a date
Use the date and time picker on the right to choose a moment in your local timezone and instantly see its Unix value in both seconds and milliseconds.

Common uses

Convert a Unix timestamp from a log or database into a readable date
Get the current epoch time in seconds or milliseconds
Turn a specific calendar date into a Unix timestamp for a query
Check whether a stored value is in seconds or milliseconds
See a timestamp in UTC and your local timezone side by side
Produce an ISO 8601 string for an API request or config file

Why choose VersaTools

100% private

Your files are processed inside your browser and are never uploaded to a server.

Free, no account

No sign-up, no watermark, no paywalled “premium” tier. Just open a tool and use it.

Instant

No upload, no queue, no server round-trip — work starts the moment you drop a file.

Runs in your browser

Built on open web standards. Works on any modern desktop browser, nothing to install.

No upload size caps

Nothing leaves your device, so there’s no server file-size limit — only your machine’s memory.

Yours to keep

Results download straight to your device in clean, standard file formats.