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

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Did You Know?

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

About this Tool

Unit Converter — Metric & Imperial

Convert between 50+ measurement units across 8 categories: Length, Area, Weight, Volume, Temperature, Speed, Pressure, and Data. Supports both metric (SI) and imperial systems with scientific precision up to 15 significant digits.

From picometers to light-years, milligrams to tons, Celsius to Fahrenheit — every conversion happens instantly with real-time updates. Click any unit card to set it as the source and see all other conversions update simultaneously.

Built for engineers, scientists, students, and developers who need quick, accurate unit conversions without ads cluttering the interface. 100% free, no sign-up required.

Conversion Examples

Length — Meters to Feet

Input: 1.85 meters

Output: 6.0696 feet / 72.835 inches

Useful for converting heights, room dimensions, or material lengths between metric and imperial.

Temperature — Celsius to Fahrenheit

Input: 37°C

Output: 98.6°F / 310.15 K

The formula is °F = °C × 9/5 + 32. This tool handles Kelvin conversions too.

Data — Gigabytes to Megabytes

Input: 2.5 GB

Output: 2,560 MB / 2,621,440 KB

Uses binary (1024-based) conversion, matching how operating systems report file sizes.

Weight — Kilograms to Pounds

Input: 75 kg → Output: 165.35 lbs

Supported Categories

Category	Example Units
Length	mm, cm, m, km, in, ft, yd, mi
Area	mm², cm², m², km², in², ft², acres, hectares
Weight	mg, g, kg, metric ton, oz, lb, stone
Volume	mL, L, gal (US), gal (UK), cup, tbsp, fl oz
Temperature	°C, °F, K
Speed	m/s, km/h, mph, knots
Pressure	Pa, kPa, bar, atm, psi, mmHg
Data	B, KB, MB, GB, TB, PB, bit

When to Use

Quick conversions during engineering or science work
Converting between metric and imperial for international projects
Checking server storage (GB ↔ TB) or network speed (Mbps ↔ MBps) calculations
Cooking conversions (cups ↔ mL, oz ↔ g)

Related Tools: Color Converter · Hash Generator · Base64 Encoder

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

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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.

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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.

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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.

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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

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Hash Generator

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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.

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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.

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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

Unit Converter — Metric & Imperial

Conversion Examples

Supported Categories

When to Use

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

Unit Converter — Metric & Imperial

Conversion Examples

Supported Categories

When to Use

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