💻 Developer Tools
101 tools in this category • Page 1 of 4 • All free to use
About Developer Tools
Our developer tools collection provides essential utilities for programming, API development, CSS optimization, and code formatting. These tools help streamline common development tasks with instant processing and validation.
All tools are designed with developers in mind, supporting common formats and providing detailed error messages. Perfect for API testing, CSS optimization, code formatting, and development workflow optimization.
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API Response Formatter
Format and beautify JSON, XML, and other API responses with syntax highlighting
ASCII Table Viewer
Display complete ASCII character set with decimal, hex, and binary values in an interactive table format
Alpha Transparency Contrast Tool - WCAG Accessibility Checker
Calculate effective color contrast when transparency/alpha is applied - WCAG accessibility compliance for semi-transparent elements
Barcode Type Detector
Identify barcode symbology (UPC-A/E, EAN-8/13, GTIN-14) from numbers and validate checksums with format analysis
Base32 Encoder/Decoder
Professional Base32 encoder/decoder with validation, format analysis, and comprehensive encoding/decoding capabilities for developers, system administrators, and security professionals
Base64 Encoder
Encode and decode Base64 strings instantly with our free Base64 Encoder tool.
Binary Converter
Convert between binary, text, decimal, and hexadecimal formats instantly with our free Binary Converter tool.
CIDR Merger (Supernet) Tool
Calculate the smallest supernet set from multiple CIDR blocks with step-by-step binary explanation
CSS Grid Generator
Professional CSS Grid layout generator with customizable columns, rows, gaps, and responsive breakpoints
CSS Minifier
Professional CSS minifier and optimizer with advanced compression algorithms
CSS Selector Auto-Generator
Professional CSS selector generator and reverse-engineering tool that analyzes HTML structure and automatically generates optimal CSS selectors. Features smart element targeting, specificity optimization, and multi-selector generation for complex web scraping and automation tasks.
Canonical Tag Tester
Paste HTML to detect canonical tag issues, loops, and SEO problems with instant fix recommendations
ChatGPT Token Counter
Estimate GPT and Claude tokens in text for prompt budgeting and API cost planning
Checksum Calculator - MD5/SHA Hash Verification
Calculate MD5, SHA-1, SHA-256, SHA-512 checksums for files with verification and comparison features
Circle of Fifths Explorer
Interactive circle of fifths tool to explore keys, scales, relative minors, and chord relationships for music theory education
Clipboard History - Local Text Log
Monitor and store local clipboard history for easy access to recently copied text items
Contrast Checker
Test WCAG contrast ratio between text and background colors with comprehensive accessibility compliance analysis
Cron Expression Tester
Input a cron string and see the next 5 run times with detailed expression breakdown and validation
Cron Expression Tester Manual
Professional cron expression tester manual tool
Cubic Bezier Visualizer - Interactive CSS Animation Easing Tool
Adjust cubic-bezier curves and preview animation easing with interactive visualization and live demos
Data URL Generator
Convert files and text to data URLs for web development and embedding
Dependency Version Comparator
Input two semver strings → shows whether major/minor/patch upgrade
Distraction Blocker - Focus & Productivity Tool
Generate visual warning overlays for distracting websites to improve focus and productivity
EAN to UPC Converter
Professional EAN-13 to UPC-A barcode converter with validation, format analysis, and comprehensive conversion capabilities for retailers, manufacturers, and inventory professionals
EXIF Metadata Viewer
Extract and view EXIF metadata from images including camera model, timestamp, GPS coordinates, and technical settings
Email Regex Tester
Validate emails with custom regex testing and pattern analysis for developers and marketers
Email Username Extractor
Extract username parts from email addresses with bulk processing and multiple output formats
Email Validator
Validate email addresses with comprehensive syntax checking and error detection
Fake Name Generator
Professional fake name generator with local datasets, demographic matching, and comprehensive contact information for development, testing, and design applications
File Size Estimator
Estimate file sizes for text and images before saving with detailed size breakdowns and format comparisons