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Developer
Toolbox

18 essential tools for everyday development. Fast, private, and free — no sign-up required.

Encoding

Base64 Encoder/Decoder

Encode or decode Base64 strings and files instantly in your browser.

Hash Generator

Generate SHA-1, SHA-256, or SHA-512 hashes from text using Web Crypto API.

URL Encoder/Decoder

Encode or decode URLs with encodeURIComponent or encodeURI modes.

Number Base Converter

Convert numbers between decimal, binary, octal, and hexadecimal.

Generators

UUID Generator

Generate UUID v4 identifiers in bulk using the browser crypto API.

Random Number Generator

Generate random integers or decimals with configurable range and count.

Password Generator

Generate secure passwords with configurable length and character types.

Data

JSON Formatter

Beautify, minify, or validate JSON with error line numbers.

JWT Decoder

Decode JWT tokens and inspect header, payload, and expiry status.

Text Diff

Compare two texts side by side with highlighted differences.

Converters

Color Converter

Convert colors between HEX, RGB, and HSL formats with live preview.

Timestamp Converter

Convert Unix timestamps to human-readable dates and back.

Timezone Comparator

Compare multiple timezones side by side with live clocks and meeting planner.

Image Resizer

Resize PNG, JPG, and WebP images client-side with aspect ratio lock.

Unit Converters

Length Converter

Convert between mm, cm, m, km, inch, foot, yard, and mile.

Weight Converter

Convert between mg, g, kg, tonne, ounce, and pound.

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin.

Health

BMI Calculator

Calculate Body Mass Index with metric or imperial units and classification.

DeveloperToolbox