DevToolbox

Free, client-side developer utilities. Every tool runs entirely in your browser — nothing is ever uploaded to a server.

Formatters

JSON Formatter

Format, validate, and minify JSON with inline error highlighting.

JWT Decoder

Decode JSON Web Tokens and inspect header, payload, and expiry.

SQL Formatter

Pretty-print SQL queries for readability.

XML Formatter

Format and validate XML documents.

Encoders

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text.

URL Encoder / Decoder

Percent-encode or decode URL components.

HTML Entity Encoder

Escape and unescape HTML entities.

Generators

Hash Generator

Generate MD5, SHA-1, and SHA-256 hashes from text.

UUID Generator

Generate v4 UUIDs in bulk.

Password Generator

Generate strong, random passwords with custom rules.

QR Code Generator

Turn any text or URL into a scannable QR code.

Lorem Ipsum Generator

Generate placeholder text for mockups and layouts.

Converters

Timestamp Converter

Convert between Unix timestamps and human-readable dates.

Color Converter

Convert colors between HEX, RGB, and HSL.

Text

Regex Tester

Test regular expressions against sample text with live match highlighting.

Text Diff Checker

Compare two blocks of text and highlight differences.

Case Converter

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

Search tools