Free DeveloperTools Online
100+ free online coding tools for developers: JSON formatter, regex tester, image converter, base64 encoder, color picker, text diff checker, and more. No signup required. All tools work offline.
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JSON Formatter
Format, minify and validate JSON with syntax highlighting and error locations
JSON Editor
Visual JSON editor with tree view and live preview
JSON to Java
Generate Java POJO classes from JSON
JSON to TypeScript
Generate TypeScript interface definitions from JSON
XML ⇌ JSON Converter
Convert between XML and JSON while preserving structure
YAML ⇌ JSON Converter
Convert between YAML and JSON with complex nesting support
CSV ⇌ JSON Converter
Convert between CSV and JSON with custom delimiter support
JavaScript Formatter
Format, minify, obfuscate and beautify JavaScript code
CSS Formatter
Format, minify and beautify CSS with property sorting
HTML Formatter
Format, minify and beautify HTML with tag validation
SQL Formatter
Format and beautify SQL with keyword highlighting
XML Formatter
Format, minify, validate and beautify XML
Base64 Encode/Decode
Encode or decode text and files using Base64
URL Encode/Decode
Encode or decode URL parameters with special characters
MD5 Hash
Compute MD5 hash for text or files
SHA Hash
SHA1/SHA256/SHA512 hashing and verification
Unicode Converter
Convert between Unicode escapes and plain text
Image Converter
Convert between JPG/PNG/WebP/BMP/TIFF and more
Image Compressor
High-quality compression to reduce size while preserving image quality
Image Resizer
Resize or crop by ratio or custom size, with batch processing
QR Code Generator
Generate QR codes with logo and style customization
QR Code Reader
Detect and parse QR code content, with batch processing
Timestamp Converter
Convert between Unix timestamp and datetime with timezone support
Date Calculator
Calculate date differences, business days and holidays
Text to Image
Render text into images with custom fonts, colors and backgrounds
Text Diff
Compare two texts and highlight differences
Regex Tester
Test and validate regular expressions in real time
Number Base Converter
Convert between binary, octal, decimal and hexadecimal
Color Converter
Convert between RGB, HEX, HSL and HSV
UUID Generator
Generate different versions of UUID/GUID
Password Generator
Generate secure random passwords with custom rules
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