Polymorpher

The Utility Factory — Free Developer Tools

Convert, transform, beautify & decode — all in one place.

🛠️ 11+ Tools

🌐 10 Languages

💰 100% Free

🔒 Zero Data Stored

⚡ All Tools

💻

Did You Know?

Select a tool from the sidebar to get started, or explore our free developer utilities.

About this Tool

DateTime Converter — Unix Epoch, ISO 8601, RFC 2822 & More

Convert between Unix timestamps (seconds, milliseconds, microseconds, nanoseconds), ISO 8601, RFC 2822, UTC, and human-readable date formats instantly. Auto-detects input format — paste any timestamp or date string and see all conversions.

Supports relative time output ("2 hours ago", "in 3 days"), day-of-year, week-of-year, and multiple regional date formats (US, EU, UK). Essential for developers working with APIs, databases, log files, JWT tokens, and cron jobs.

Zero data storage — your timestamps never leave your browser. Free online epoch converter for developers.

Live Examples

Example 1 — Unix timestamp (seconds) to all formats

Input: 1772694478

Output:

UNIX (s)    1772694478
UNIX (ms)   1772694478000
ISO 8601    2026-03-05T10:07:58+00:00
RFC 2822    Thu, 05 Mar 2026 10:07:58 +00:00
US Date     03/05/2026 10:07:58 AM
EU Date     05.03.2026 10:07:58
Relative    ~1 month ago

Example 2 — ISO 8601 date to Unix timestamp

Input: 2026-04-06T15:30:00Z

Output: Shows Unix seconds, milliseconds, and all regional date formats.

Example 3 — Millisecond timestamp (JavaScript Date.now())

Input: 1772694478000

The converter auto-detects millisecond timestamps (>10 billion) and converts correctly — no manual adjustment needed.

Example 4 — Human-readable date string

Input: March 5, 2026 10:00 AM

Natural language dates are parsed and converted to all machine-readable formats.

Auto-Detection Logic

Input Range	Detected As
< 10 billion	Unix seconds
10B – 1 trillion	Unix milliseconds
1T – 1 quadrillion	Unix microseconds
> 1 quadrillion	Unix nanoseconds
Non-numeric	Date string (ISO, RFC, natural language)

When to Use

Converting JWT exp / iat claims to human-readable dates
Debugging API timestamps in log files
Converting between JavaScript Date.now() (ms) and Unix time() (s)
Checking "how long ago" a database record was created
Converting regional date formats for international teams (US → EU)

Limitations

Timezone-aware output uses the offset from the input; ambiguous inputs default to UTC
Dates before Unix epoch (Jan 1, 1970) may not parse correctly from numeric input

Related Tools: JWT Decoder · JSON to Classes · Hash Generator

Free Online Developer Tools

12 professional-grade utilities — zero sign-up, zero data storage. Every transformation is stateless and private.

🔄

JSON to Code Classes

Convert JSON to strongly-typed classes in C#, Java, Python, TypeScript, Go, Kotlin, Dart, Ruby, Swift, and Rust. Supports nested objects, arrays, and nullable types. Reverse transform generates JSON from code.

🗃️

SQL to Code Classes

Transform SQL CREATE TABLE statements into EF Core entities, POCO classes, or C# Records. Auto-generates [Key], [Required], [MaxLength] data annotations with correct type mapping.

✨

Code Beautifier & Formatter

Beautify and format minified JSON and C# code instantly. Reverse transform minifies formatted code back into compact single-line output for production use.

📐

Unit Converter

Convert between 50+ measurement units across Length, Area, Weight, Volume, Temperature, Speed, and Data categories. Supports metric (SI) and US Imperial systems with 15-digit precision.

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Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 strings back to plain text. Essential for APIs, JWT tokens, email encoding (MIME), data URIs, and HTTP authentication headers. Full UTF-8 support.

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URL Encoder & Decoder

Encode text for safe URL usage with percent-encoding or decode URL-encoded strings. Handles query strings, form data, API parameters, and all special characters including Unicode.

🛡️

Hash Generator

Generate cryptographic hash digests using MD5, SHA1, SHA256, SHA384, SHA512. Supports HMAC with secret keys for API authentication, webhook verification, and data integrity checks.

🔑

JWT Token Decoder

Decode JSON Web Tokens to inspect header and payload claims without the signing secret. Debug OAuth2 flows, verify token expiration, and understand JWT structure instantly.

🎨

Color Converter

Convert colors between HEX, RGB, and HSL formats with live preview. Auto-detects input format and outputs CSS variables and Tailwind CSS classes ready for your codebase.

🔍

Regex Tester

Test regular expressions against text with match highlighting, capture groups, and detailed results. Supports .NET regex flavor including lookaheads, lookbehinds, and named groups.

🕐

DateTime Converter

Convert between Unix timestamps (seconds, milliseconds, microseconds), ISO 8601, RFC 2822, and human-readable dates. Auto-detects input format with relative time output.

📊

Text Statistics

Analyze any text for character count, word count, sentence count, top 10 frequent words, reading time estimation, average word length, and UTF-8 file size calculation.

How It Works

Three simple steps — paste, transform, copy. No sign-up, no installation, no data stored.

Paste Your Input

Select a tool from the sidebar and paste your text, code, or data into the input editor. Polymorpher auto-detects the format.

Transform Instantly

Click "Transform" — the result appears in milliseconds. Most tools support reverse transform with the swap button.

Copy & Use

One-click copy puts the result on your clipboard. Your input is processed in real-time and immediately discarded — zero data retention.

Frequently Asked Questions

Is Polymorpher really free?

Yes, 100% free with no sign-up, no trial period, and no premium tier. All 12 tools are available without any account or payment.

Is my data safe? Do you store anything?

Polymorpher is fully stateless. Your code, JSON, SQL, tokens, and all other input are processed in real-time and immediately discarded. We have no database — nothing is stored, logged, or tracked. Your data never touches a disk.

What programming languages are supported for JSON to Code conversion?

Polymorpher supports 10 languages: C#, Java, Python, TypeScript, Go, Kotlin, Dart, Ruby, Swift, and Rust. Each generates idiomatic code with proper naming conventions, type inference, and nested class support.

How does the hash generator work? Does it support HMAC?

The hash generator supports MD5, SHA1, SHA256, SHA384, and SHA512 algorithms. You can select a specific algorithm or generate all digests at once. HMAC mode is supported — enter a secret key to produce authenticated message digests used for API signatures and webhook verification.

Can I use Polymorpher offline?

Polymorpher requires an internet connection since transformations are processed by our .NET 10 API for accuracy and speed. However, the processing is stateless — each request is independent and nothing is cached server-side.

What is the reverse transform / swap feature?

Most tools support bi-directional conversion. For example, Base64 encode ↔ decode, URL encode ↔ decode, JSON to C# ↔ C# to JSON. Click the "Swap" button to reverse the transform direction instantly.

Polymorpher

⚡ All Tools

Did You Know?

Welcome to Polymorpher

Unit Converter

About this Tool

DateTime Converter — Unix Epoch, ISO 8601, RFC 2822 & More

Live Examples

Auto-Detection Logic

When to Use

Limitations

Free Online Developer Tools

JSON to Code Classes

SQL to Code Classes

Code Beautifier & Formatter

Unit Converter

Base64 Encoder & Decoder

URL Encoder & Decoder

Hash Generator

JWT Token Decoder

Color Converter

Regex Tester

DateTime Converter

Text Statistics

How It Works

Paste Your Input

Transform Instantly

Copy & Use

Frequently Asked Questions

From Our Blog

How to Convert JSON to C# Classes

SHA256 vs MD5: Which Hash Algorithm?

Understanding JWT Tokens

10 Regex Patterns Every Developer Should Know

Base64 Encoding Explained

JSON to Python Dataclass

Our Content Standards

Polymorpher

⚡ All Tools

Did You Know?

Welcome to Polymorpher

Unit Converter

About this Tool

DateTime Converter — Unix Epoch, ISO 8601, RFC 2822 & More

Live Examples

Auto-Detection Logic

When to Use

Limitations

Free Online Developer Tools

JSON to Code Classes

SQL to Code Classes

Code Beautifier & Formatter

Unit Converter

Base64 Encoder & Decoder

URL Encoder & Decoder

Hash Generator

JWT Token Decoder

Color Converter

Regex Tester

DateTime Converter

Text Statistics

How It Works

Paste Your Input

Transform Instantly

Copy & Use

Frequently Asked Questions

From Our Blog

How to Convert JSON to C# Classes

SHA256 vs MD5: Which Hash Algorithm?

Understanding JWT Tokens

10 Regex Patterns Every Developer Should Know

Base64 Encoding Explained

JSON to Python Dataclass

Our Content Standards

Metric System