The Developer Utility Hub

Strictly local processing. Your data never leaves the browser.
Paste your text below to get started, or browse our robust collection of tools.

Smart Input Auto-Detect

Paste any string (JSON, JWT, Cron, Base64, Colors, HTML) here. We'll instantly recommend the best tools for the job.

All Utilities 21 tools

URL Encoder / Decoder

Safely encode or decode URL components.

Base64 Encoder / Decoder

Convert text or binary data to Base64 format.

Decode JSON Web Tokens and view header/payload.

Format, validate, and minify JSON data.

JSONPath / JMESPath Tester

Extract nested values from JSON using JSONPath or JMESPath-like queries.

Test regular expressions against target strings.

Text Diff / Compare

Compare two text blocks line-by-line or word-by-word.

cURL ↔ fetch/axios Converter

Convert API requests between cURL commands and JavaScript snippets.

Image to Base64

Convert images to Base64 Data URIs or preview encoded strings.

Generate SHA-256, SHA-512, and SHA-1 cryptographic hashes.

Generate RFC 4122 UUID v4 identifiers in bulk.

Password Generator

Generate cryptographically secure random passwords.

JSON ↔ YAML Converter

Convert between JSON and YAML formats instantly.

Number Base Converter

Convert between Binary, Octal, Decimal, and Hexadecimal.

HTML Entity Encoder

Encode/decode HTML special characters to entities.

Unix Timestamp Converter

Convert Unix timestamps to dates and vice versa.

Cron Expression Parser

Decode cron schedules in plain English with presets.

Color Converter

Convert colors between HEX, RGB, and HSL with palettes.

QR Code Generator

Generate customizable QR codes from any URL or text.

Convert text between camelCase, snake_case, kebab-case, and more.

Markdown Previewer

Live Markdown preview with GitHub Flavored Markdown support.