How do I convert a Unix timestamp to a date?

Paste the timestamp (in seconds, milliseconds, microseconds, or nanoseconds) into the timestamp-to-date converter above. It automatically detects the unit and shows the equivalent UTC time, your local time, ISO 8601 format, and a human-readable relative time.

How do I validate and format JSON online?

Paste your JSON into the JSON formatter and validator, then click Format to pretty-print it or Validate to check its syntax. Switch to Tree View to explore nested objects and arrays interactively, similar to a JSON viewer.

Is the JavaScript playground safe to run untrusted code?

Code entered in the JavaScript playground runs inside a sandboxed iframe with a unique origin, no cookie or DOM access to the main page, no network requests, and an automatic timeout that stops runaway scripts, so it cannot read your data or affect the rest of the site.

Free Developer Tools Online

Unix timestamp & epoch converter, JSON viewer/formatter, sandboxed JavaScript playground, regex tester, timezone converter, Base64/URL tools, color converter, string utilities, UUID & password generator — everything runs locally in your browser.

Current Unix Timestamp

seconds since Jan 1, 1970 UTC

The Unix timestamp (epoch time) converter below converts epoch to date and date to epoch instantly, auto-detects seconds/milliseconds/microseconds, supports any timezone, and includes a timestamp calculator — a free alternative to epochconverter.com that runs entirely client-side.

Current Time

Local Time

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UTC / GMT Time

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Unix Timestamp (seconds)

Unix Timestamp (ms)

Timestamp → Date (Epoch Converter)

Paste a Unix timestamp in seconds, milliseconds, microseconds, or nanoseconds — the unit is auto-detected.

Unix Timestamp

Leave empty to use the current time

Display Timezone

Date → Timestamp (Epoch)

Date & Time

Interpret Date As

Timestamp Calculator

Add or subtract time from a Unix timestamp — useful for computing expiry times, TTLs, or deadlines.

Base Timestamp (seconds)

Amount

Unit

Known Epoch Values & Reference

Common reference points, useful for spotting off-by-one and overflow bugs.

Event	Unix Timestamp	UTC Date

What is a Unix timestamp / epoch time?

A Unix timestamp counts the seconds elapsed since 00:00:00 UTC on January 1, 1970 (the "Unix epoch"), ignoring leap seconds. It's a compact, timezone-free way for programs and databases to represent an exact moment in time.

Why are some timestamps 13 digits instead of 10?

A 10-digit value is typically seconds since the epoch; 13 digits usually means milliseconds (used by JavaScript's Date.now()), 16 digits means microseconds, and 19 digits means nanoseconds. This tool detects the unit automatically.

What happens on January 19, 2038?

Systems that store Unix time as a signed 32-bit integer will overflow at 03:14:07 UTC on 19 January 2038 — the "Year 2038 problem." Most modern systems use 64-bit timestamps and are unaffected.

A free online JSON formatter, validator, beautifier and tree viewer — paste JSON to pretty-print, minify, validate, or explore it as a collapsible, searchable tree, similar to jsonviewer.stack.hu. Also tolerates common mistakes: single-quoted strings, unquoted keys/values, trailing commas, and // or /* */ comments — it will auto-fix and tell you what changed.

JSON Formatter, Validator & Viewer

JSON Input

0 characters

Format valid JSON above to see the interactive tree.

Path:

Write and run JavaScript online with live console output. Code executes inside an isolated, sandboxed frame — an in-browser JS playground / online JS compiler with no access to this site's cookies, storage, or network.

JavaScript Playground

Code Editor

Console Output

🛡️

Sandboxed execution. Your code runs inside an isolated iframe with a unique origin: it cannot read this page's cookies or DOM, cannot make network requests, and is automatically stopped if it runs longer than 5 seconds (e.g. an infinite loop).

ℹ️ Tips:

Use console.log() to print output
Supports modern ES6+ JavaScript syntax
Use console.error() / console.warn() for styled messages
Press Ctrl/Cmd + Enter to run
Runaway loops are killed automatically after 5 seconds

Test regular expressions against sample text in real time — a free online regex tester supporting global, case-insensitive, and multiline flags.

Regex Pattern Tester

Regex Pattern

Enter a valid regex pattern (without delimiters)

Flags

Global (g) Case Insensitive (i) Multiline (m)

Text to Test

Common Regex Patterns

Email Address

^[^\s@]+@[^\s@]+\.[^\s@]+$

URL

https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b

Phone Number

^\+?[\d\s\-]{7,}$

Password (8+ chars)

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$

Hex Color Code

^#?([a-f0-9]{6}|[a-f0-9]{3})$

Alphanumeric Only

^[a-zA-Z0-9]+$

Click a pattern to copy it to the pattern field

A world clock and timezone converter showing the current time across major cities, with support for adding any IANA timezone.

Current Time in Different Timezones

Add Custom Timezone

Use IANA timezone format (e.g. Europe/London, Asia/Kolkata)

Encode or decode text using Base64 or URL encoding — handy for API payloads, query strings, and data URIs.

Base64 Encoder / Decoder

Input

Output

URL Encoder / Decoder

Input

Output

Convert colors between HEX and RGB with a live preview — a simple online color picker and converter.

Color Converter

Pick Color

HEX Value

RGB Value

Transform text case, reverse strings, trim whitespace, and count characters and words online.

String Utilities

Input Text

Output

Characters

Words

Generate random UUIDs (GUIDs) and strong, secure random passwords for free, entirely in your browser.

UUID Generator

Generate random universally unique identifiers (UUID v4 / GUID)

Password Generator

Create secure random passwords

Length

Uppercase Lowercase Numbers Symbols