Developer Toolbox

Free online tools for everyday coding tasks. Fast, secure, and runs entirely in your browser.

JSON Formatter

Format, validate, and minify JSON data with syntax highlighting.
UUID Generator

Generate random UUIDs (v1, v4) individually or in bulk.
Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 to text.
JWT Decoder

Decode and inspect JSON Web Tokens (JWT) header and payload.
URL Encoder/Decoder

Encode or decode URLs and query parameters.
Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text or files.
Timestamp Converter

Convert Unix timestamps to dates and vice versa.
Regex Tester

Test regular expressions with real-time matching and highlighting.
Diff Checker

Compare two texts and highlight the differences.
Markdown Preview

Write Markdown and preview in real-time with GFM support.
Color Converter

Convert colors between HEX, RGB, HSL, and HSV formats.
Case Converter

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

Convert numbers between binary, octal, decimal, and hexadecimal.
HTML Entity Encoder

Encode and decode HTML entities for safe display.
Hex Editor

View and edit text in hexadecimal format with hex dump view.
JSON-YAML Converter

Convert between JSON and YAML formats instantly.
CSV-JSON Converter

Convert between CSV and JSON data formats.
Lorem Ipsum Generator

Generate placeholder text for your designs and mockups.
Text Statistics

Analyze text with word count, reading time, and more.
Line Sorter

Sort lines, remove duplicates, and manipulate text.
SQL Formatter

Format and beautify SQL queries with proper indentation.
XML Formatter

Format, beautify, and validate XML documents.
Cron Parser

Parse cron expressions and see next execution times.
CSS Minifier

Minify CSS to reduce file size or beautify for readability.
JS Beautifier

Beautify or minify JavaScript code for development.
Chmod Calculator

Calculate Unix file permissions with visual matrix.
.gitignore Generator

Generate .gitignore files for various languages and frameworks.
robots.txt Generator

Create robots.txt files to control search engine crawling.
Meta Tag Generator

Generate SEO meta tags, Open Graph, and Twitter Cards.
Open Graph Preview

Preview how links appear on social media platforms.

Why Developer Toolbox?

100% Client-Side

All processing happens in your browser. Your data never leaves your device.

Fast & Free

No sign-up required. Instant results with no server round-trips.

Dark Mode

Easy on the eyes with automatic dark mode support.