🛠 Developer Toolkit

40+ free online tools for developers. JSON formatter, Base64 encoder, JWT decoder, hash generator & more. Everything runs in your browser — your data never leaves your machine.

🔍 Smart Detect — Paste anything

Paste text and we'll detect the format and suggest the right tool.

📝 Formatters

JSON Formatter

Format, validate and beautify JSON data with syntax highlighting

SQL Formatter

Format and beautify SQL queries for better readability

XML Formatter

Format and beautify XML documents

CSS Formatter

Beautify or minify CSS code

HTML Formatter

Format and beautify HTML code

🔐 Encoders & Decoders

Base64 Encode/Decode

Encode or decode Base64 strings instantly

URL Encode/Decode

Encode or decode URL (percent-encoding) strings

HTML Entity Encode/Decode

Encode or decode HTML entities

JWT Decoder

Decode and inspect JSON Web Tokens (JWT) — header, payload, signature

🎲 Generators

UUID Generator

Generate UUID v4 (random) identifiers

ULID Generator

Generate ULID (Universally Unique Lexicographically Sortable Identifier)

Password Generator

Generate strong random passwords with customizable options

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

Lorem Ipsum Generator

Generate placeholder text for design and development

Slug Generator

Convert text to URL-friendly slugs with customizable separators

🔁 Converters

JSON ↔ YAML

Convert between JSON and YAML formats

JSON ↔ CSV

Convert between JSON arrays and CSV format

JSON ↔ XML

Convert between JSON and XML formats

Timestamp Converter

Convert between Unix timestamps and human-readable dates

Number Base Converter

Convert between binary, octal, decimal and hexadecimal

Color Converter

Convert between HEX, RGB, HSL color formats with preview

📊 Text Tools

Text Statistics

Count words, characters, sentences, paragraphs and reading time

Case Converter

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

Diff Checker

Compare two texts and highlight differences

Markdown Preview

Preview Markdown with live rendering

Text Reverser

Reverse text, words, or lines instantly

🔍 Testers

Regex Tester

Test regular expressions with real-time matching and capture groups

Cron Expression Parser

Parse and explain cron expressions with next run times

JWT Generator

Create JSON Web Tokens with custom headers, payloads and signing

JWT Inspector

Decode JWTs with expiration validation and detailed claim analysis

IP Address Info

Look up your public IP address and geolocation details

HTML Preview

Live preview HTML/CSS/JS code in a sandboxed iframe

⚡ Advanced

JSON Key Sorter

Sort JSON object keys alphabetically at all nesting levels

HTML to JSX

Convert HTML to React JSX — class→className, style objects, self-closing tags

Chmod Calculator

Calculate Unix file permissions — numeric and symbolic notation

JSONPath Evaluator

Query JSON data using JSONPath expressions with live results

QR Code Generator

Generate QR codes from any text or URL — entirely client-side

ASCII Art Generator

Convert text to large ASCII art block letters

Epoch Batch Converter

Convert multiple timestamps at once — paste a list, get results

CSS Unit Converter

Convert between px, rem, em, pt, and viewport units