Free Online Developer Tools
JSON formatter, Base64, URL encoder, CSS generators, hashing. 100% free, browser-fast, and strictly private.
About Developer Tools on Toolsgn.online
Essential utilities engineered specifically for software engineers, frontend developers, and API creators. Format minified JSON payloads, encode sensitive strings, test complex regular expressions, and inspect tokens with zero friction.
Every developer tool runs entirely client-side, ensuring your confidential API responses, secrets, and database dumps never touch remote servers.
Available Developer Tools (24)
JSON Formatter / Validator
Format, validate and minify JSON
Base64 Encoder / Decoder
Encode and decode Base64 text
URL Encoder / Decoder
Encode and decode URLs
CSS Gradient Generator
Create CSS gradients visually
Box Shadow Generator
Create CSS box shadows visually
Hash Generator
Generate MD5, SHA-256 hashes
Regex Tester
Test regular expressions visually
Code Formatter
Format HTML, CSS, JS, Markdown
Cron Generator
Generate cron schedule expressions
CSS Minifier
Compress and minify CSS code
CSV to JSON Converter
Convert CSV to JSON and JSON to CSV
Text Encryption & Decryption
Encrypt and decrypt text with AES-256
HTML Entity Encoder & Decoder
Encode and decode HTML special entities
JWT Decoder & Inspector
Decode and inspect JSON Web Tokens (JWT)
Number Base Converter
Convert between Binary, Hex, Decimal, and Octal
SQL Formatter & Beautifier
Format and beautify complex SQL queries
Unix Timestamp Converter
Convert Unix timestamps to dates and vice versa
XML Formatter & Beautifier
Format, indent, and beautify XML documents
XML Validator & Syntax Checker
Validate XML syntax and detect errors with line numbers
YAML Formatter & Validator
Format, validate, and convert YAML configuration files
JSON to XML Converter
Convert JSON data into structured XML markup
XML to JSON Converter
Convert XML documents into structured JSON objects
JavaScript Minifier
Minify and compress JavaScript code to reduce file size
HTML Minifier & Compressor
Minify and compress HTML markup to optimize page speed