Unix Timestamp Converter

Type a timestamp to see every readable form of it, or pick a date to get the timestamp. Auto-detects seconds vs milliseconds.

Timestamp or date

How to use

Convert Unix seconds or milliseconds to dates and back, in your timezone or UTC. Your data is processed only inside this browser tab.

10 digits or 13?

Both are detected automatically — seconds and milliseconds.

Which timezone is shown?

Your browser's local time and UTC, side by side.

Turn an IP range into the smallest CIDR set, or a CIDR block back into its range. IPv4 and IPv6.

Netmask, wildcard, host capacity and subnet splits for any IPv4 address.

Beautify, minify and validate JSON right in your browser. No uploads, nothing leaves your device.

Live matches, capture groups and a replace preview for JavaScript regex.

Convert text or files to Base64 and back, with correct UTF-8 handling.

Percent-encode or decode URLs and parameter values, plus a query breakdown.