Free DeveloperUtilities & Tools
Fast, free, and privacy-focused tools for developers. Format JSON, SQL, and XML; convert YAML; build cron schedules; and more — all processing stays in your browser.
Explore the Toolbox
Formatters, converters, encoders, and generators — pick a utility and get started in seconds.
JSON Formatter
Format, validate, and beautify JSON data instantly
SQL Formatter
Beautify and minify SQL queries instantly
XML Formatter
Beautify, validate, and minify XML documents
YAML ↔ JSON Converter
Convert between YAML and JSON instantly
Base64 Encoder
Encode and decode Base64 strings with ease
Diff Checker
Compare text differences with highlighted changes
Cron Generator
Build and explain standard cron expressions
Case Converter
camelCase, snake_case, kebab-case, and more
HTML Entity Encoder
Encode and decode HTML entities safely
Markdown Preview
Live Markdown editor with HTML preview
Number Base Converter
Convert binary, octal, decimal, and hex
JSON ↔ CSV Converter
Convert JSON arrays to CSV and back
UUID Generator
Generate UUID v4 & v7 identifiers instantly
Hash Generator
Generate MD5, SHA-1, SHA-256 hashes
Password Generator
Create strong, secure passwords instantly
Regex Tester
Test and debug regular expressions live
URL Encoder
Encode and decode URL components
JWT Decoder
Decode, verify HS256, and sign JWTs
chmod Calculator
Unix permissions — 755, 644, and more
HTTP Status Codes
Searchable 200, 404, 429, 502 reference
ENV File Validator
Validate .env, find dupes, export JSON
Semver Calculator
Check if a version matches ^ / ~ ranges
Timestamp Converter
Convert Unix timestamps to human dates
QR Code Generator
Create QR codes for URLs, WiFi, and vCards
Color Picker
Pick colors and convert HEX, RGB, HSL
Lorem Ipsum Generator
Generate placeholder text for designs
Free Developer Tools & Utilities Online
DevUtil is a fast toolkit for everyday developer tasks. Each tool runs in your browser, so data stays on your device. Format JSON, SQL, and XML; convert YAML ↔ JSON or JSON ↔ CSV; preview Markdown; build cron schedules; transform text case; encode HTML entities; generate UUID v4/v7; and test regex patterns — without installing anything. New here? Start with the developer guides or see what's new.
Use DevUtil as a lightweight hub for common workflows. Format a JSON response, then jump to the YAML converter for config files. Decode a JWT and open the JSON formatter to inspect the payload. Build a cron expression, then compare config diffs. These links keep your flow moving and reduce copy-paste errors.
The toolkit focuses on simple, single-purpose utilities with clear actions, practical defaults, and instant results. If you need a quick formatter, converter, encoder, or generator, pick a tool below and get started in seconds.
JSON Formatter · SQL Formatter · XML Formatter · YAML ↔ JSON · JSON ↔ CSV · Cron Generator · Markdown Preview · Case Converter · Number Base Converter · HTML Entity Encoder · Base64 Encoder · Diff Checker · UUID Generator · Hash Generator · Regex Tester · URL Encoder · JWT Decoder · chmod Calculator · HTTP Status Codes · ENV File Validator · Semver Calculator · Timestamp Converter · Password Generator · Lorem Ipsum Generator · QR Code Generator · Color Picker · Guides
Why Choose DevUtil?
Privacy First
All processing happens locally in your browser. Your data never touches our servers.
Lightning Fast
Instant results with no server roundtrips. Tools load and process data in milliseconds.
Always Free
No subscriptions, no hidden fees, no account required. Use all tools completely free.