Free Privacy-First Developer Tools
Everyday utilities for formatting, decoding, inspecting, and generating developer data. Your tool inputs stay on your device.
Quick Paste
Paste any content — automatically detect its format and suggest the right tool.
The app detects JSON, JWT, SQL, Stack Trace, Base64, Regex, and Cron formats and suggests the right tool.
Explore developer tools
Open a focused tool directly, or paste unknown content above and let Devutilio suggest the right workflow.
Random Generator
Generate cryptographically strong random strings and numbers entirely in your browser.
JSON Formatter
Format, validate, and minify JSON with clear error details.
JSON Workbench
Repair, compare, and generate code from JSON entirely in your browser.
Base64
Encode and decode Base64 strings with full Unicode support.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes entirely in your browser.
SQL Formatter
Format and improve SQL statements with support for SELECT, INSERT, UPDATE, and DELETE.
SQL Dialect Converter
Convert SQL between Oracle, PostgreSQL, MySQL, MariaDB, and SQL Server locally in your browser.
JWT Decoder
Decode and inspect JWT tokens, including header, payload, and expiration time.
Cron Generator
Build cron expressions visually and understand their schedules at a glance.
Stack Trace
Analyze Java and Node.js stack traces with readable, color-coded frames.
Regex Tester
Test regular expressions with live match highlighting.
JSON → Java DTO
Convert JSON to Java classes with optional Lombok and Jackson annotations.
Docker Compose
Generate a docker-compose.yml file from a straightforward service form.
Local input processing
Sensitive tool inputs are processed in your browser instead of being uploaded to the application.
Free and ready
Use every tool without creating an account, installing software, or navigating through ads.
English and Vietnamese
Switch languages while keeping technical names, code, and input data unchanged.