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Free Online Tools for Developers & Productivity

ToolZone is a curated collection of 28 free online tools for developers, designers, writers, and everyday productivity. Every tool runs entirely in your browser — no signup, no uploads. Your tool input never leaves your device.

Format and validate JSON, generate strong passwords, encode and decode Base64 or URLs, test regular expressions, convert colors, build CSS gradients, calculate BMI or age, generate Lorem Ipsum, hash text with MD5 or SHA-256, and more — all from a single fast, private, dark-themed workspace.

Whether you're a developer needing quick utilities, a designer working with colors and gradients, or a writer counting words and characters, ToolZone gives you instant, low-clutter access to professional-grade web tools that work offline once loaded.

Free Unix Timestamp Converter

Convert Unix timestamps (epoch seconds or milliseconds) to readable UTC and local dates, or convert a date back to an epoch timestamp. Essential for debugging logs, APIs, JWT tokens and database records.

Features

How to use

  1. Step 1. Paste a timestamp or pick a date.
  2. Step 2. See the converted value instantly.
  3. Step 3. Copy the result.

Real use case: correlating an API log with a customer complaint

A customer reports a failed payment "around 3pm yesterday". The payment provider's webhook log records only created: 1772636400, and the internal logs are in UTC while the customer is in Casablanca.

Converting the Unix timestamp shows the exact UTC instant and the local equivalent, letting support line the webhook up with the application log entry two seconds later — and prove the failure was a card decline, not an outage.

How Timestamp Converter works

A Unix timestamp counts seconds since 1970-01-01T00:00:00Z. JavaScript's Date works in milliseconds, so a 10-digit value is multiplied by 1000 and a 13-digit value is used as-is — the tool detects the magnitude to avoid the classic 1970-vs-now mistake.

Conversion to a readable date uses toISOString for the unambiguous UTC form and toLocaleString for your device's timezone, so daylight-saving transitions are applied by the browser's IANA timezone database rather than a fixed offset.

Going the other way, a date entered without a timezone is interpreted in local time; appending Z forces UTC. Always store timestamps in UTC and convert only for display.

Timestamp Converter vs similar tools

Timestamp handling compared:

ToolHow it worksTrade-off
date CLIdate -d @1772636400 in a terminal.Flag syntax differs between GNU and BSD/macOS, which trips people up mid-incident.
new Date(x) in devtoolsQuick conversion in the console.Easy to forget the ×1000 for seconds and land in January 1970.
ToolZone Timestamp ConverterAuto-detects seconds vs milliseconds, shows UTC and local, converts both directions.Single values, not bulk log conversion.

Frequently Asked Questions

What is a Unix timestamp?

The number of seconds (or milliseconds) since January 1, 1970 00:00:00 UTC — the standard way computers store moments in time.

Seconds vs milliseconds — how do I tell?

A 10-digit number is seconds; a 13-digit number is milliseconds. We auto-detect based on length.

Related Developer tools

JSON FormatterBase64 Encoder / DecoderURL Encoder / DecoderHTML Encoder / Decoder

Guides worth reading

Unix Timestamp ExplainedHow to Validate JSON and Fix Common Syntax ErrorsBase64 Is Not Encryption: What It Actually DoesHow to Decode a JWT Safely

Browse all ToolZone guides →