50+ Free Online Developer Utilities
Secure, client-side online tools for formatting, validation, encoders, generators, and converters. No data ever leaves your device.
All Tools (50)
XML Formatter
Format, align, and pretty print complex XML documents and documents structures.
HTML Formatter
Format HTML source code templates for better code readability and structure alignment.
HTML Entity Encoder & Decoder
Encode special characters into HTML entities to safely display code snippets, and decode them back.
HTML to Markdown Converter
Convert raw HTML tag markup to clean, simplified Markdown content.
XML to JSON Converter
Convert structured XML tag configurations into standard JSON objects.
Markdown Live Editor & Previewer
Write markdown syntax on the left and see formatted HTML rendering dynamically on the right.
JSON Formatter
Clean, format, and beautify your JSON data with custom indentation and formatting rules.
JSON Validator
Check if your JSON data is syntax-valid and see descriptive error details if parse fails.
JWT Decoder
Decode and extract information from JSON Web Tokens (JWT) client-side without compromising security.
UUID Generator
Generate secure, random UUID v4 strings individually or in batches for database primary keys.
Secure Password Generator
Create cryptographically strong, random passwords with customizable parameters (numbers, symbols, length).
QR Code Generator
Generate high-quality QR codes for URLs, text messages, or contact details instantly.
URL Encoder & Decoder
Safely encode or decode special characters in URLs for query parameters and API payloads.
Base64 Encoder & Decoder
Convert plaintext data or strings to Base64 format and decode them back to standard text.
SQL Formatter
Beautify and format your SQL queries with proper alignment, indentation, and capitalization keywords.
Epoch Timestamp Converter
Convert Unix epoch timestamps to human-readable date-time formats and vice-versa.
Color Code Converter
Convert color codes between Hex, RGB, HSL, and clean CSS declarations with real-time visual previews.
Regex Tester
Test, evaluate, and match regular expressions against test text inputs in real-time.
Hash Generator
Generate secure MD5, SHA-1, and SHA-256 cryptographic checksums for text inputs.
String Case Converter
Instantly convert strings between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and kebab-case.
Lorem Ipsum Generator
Generate random placeholder text paragraphs, sentences, or lists for UI design layout mockups.
Binary/Hex/Decimal Converter
Convert number values between Binary, Octal, Decimal, and Hexadecimal representations.
CSV to JSON Converter
Convert spreadsheet data (CSV format) to parsed, fully formatted JSON structures.
User Agent Parser
Analyze and extract browser type, OS version, engine, and device vendor from a user agent string.
Morse Code Generator
Translate text to Morse code signals and play back or copy the output.
Date Calculator
Calculate the precise duration, days, hours, and weeks between two selected calendar dates.
CSS Box Shadow Generator
Design elegant CSS box shadows visually with real-time browser preview and generated CSS output code.
CSS Gradient Generator
Visually create linear and radial CSS gradients with unlimited color stops.
CSS Flexbox Visualizer & Generator
Visualize CSS Flexbox layouts dynamically and generate copy-pasteable CSS declarations.
URL Parser & Query String Splitter
Break down an absolute URL into its components: host, port, protocol, path, and parsed query variables.
IP Address & Client Info Lookup
Detect your current public IP address, browser dimensions, device details, and screen depth.
Multi Unit Converter
Convert quantities between Length, Weight, Temperature, Area, and Volume systems.
Percentage Calculator
Calculate fractional proportions, percentage increases, percentage decreases, and ratio percentage returns.
Word & Character Counter
Count words, characters, sentences, paragraphs, and reading times dynamically.
Text to Speech Reader
Synthesize written text into spoken voice prompts using standard local Web Speech APIs.
Caesar Cipher Encryptor/Decryptor
Encode and decode messages using the classic Caesar shift cipher algorithm with custom key shifts.
ROT13 Encoder & Decoder
Obfuscate and decode text inputs using the standard ROT13 rotation cipher (shift of 13 places).
Cron Expression Generator & Reader
Generate cron schedule syntax and parse existing cron schedules into readable descriptions.
Random Number Generator
Generate single or bulk random numbers within a custom range, with or without duplicates.
List Sorter & Shuffler
Sort text lists alphabetically, reverse list entries, remove empty items, or shuffle lists randomly.
Duplicate Line Remover
Remove repeated lines and items from text lists while preserving ordering.
ASCII & Character Code Lookup
Find character keys, ASCII codes, binary codes, Hex encodings, and HTML entity representations.
URL Slug Generator
Clean strings to generate URL-safe SEO slugs, converting characters to lowercase and removing symbols.
Text Diff Checker
Compare two text passages side-by-side to highlight character, word, or line differences.
Binary to Text Converter
Translate binary digits (0s and 1s) to ASCII english characters and vice-versa.
MIME Types Quick Reference
Lookup common file extensions and their corresponding MIME Content-Types.
HTTP Status Codes Reference
Review common HTTP response status codes, categories (1xx-5xx), and standard descriptions.
Base32 Encoder & Decoder
Encode plain text strings using standard RFC 4648 Base32 alphabet and decode them.
Image to Base64 Converter
Load images from your device and encode them directly into data URL Base64 strings for CSS/HTML.
Phone Number Standardizer
Format phone numbers into clean international formats, extracting country and area dialing codes.
📚 Developer Articles & SEO Guides
Read our deep-dives on data formats, security configurations, and web monetization.
Demystifying JSON Formatting and Validation: A Developer's Guide
Learn the difference between clean, formatted JSON data and raw JSON strings. Find out how validator tools parser logs work to fix syntax issues.
Understanding JWT Structures: How to Securely Decode Tokens
Deep-dive into the JSON Web Token (JWT) standard. Understand header, payload, and signature sections, and how to inspect claims safely.
A Comprehensive Guide to UUID v4 Generation and Best Practices
What is a Universally Unique Identifier? Understand UUID structure, random entropy, and why Version 4 is ideal for database keys.
How to Generate Secure Cryptographic Passwords
Best practices for password security. Learn why entropy matters and how to programmatically create secure passwords.