Developer Tools

Essential tools for developers and programmers

JSON Formatter

Format, validate, and beautify JSON with syntax highlighting

Base64 Encoder/Decoder

Encode and decode Base64 strings

URL Encoder/Decoder

Encode and decode URLs with different encoding types

Hash Generator

Generate MD5, SHA1, SHA256, SHA512 hashes

QR Code Generator

Generate QR codes for text, URLs, WiFi, and more

IP Address Checker

Check your public IP address (IPv4/IPv6) and browser information

Tokenizer Playground

Real-time tokenization with popular LLM models (GPT-4, GPT-3.5, GPT-5)

Password Strength Checker

Check password strength, estimate crack time, and generate secure passwords

Regex Tester

Test and debug regular expressions with real-time match highlighting

JWT Decoder

Decode and inspect JSON Web Tokens — header, payload, and signature

UUID Generator

Generate random UUIDs (v4) instantly — single or bulk

Cron Expression Explainer

Translate cron expressions into plain English and preview next run times

Unix Timestamp Converter

Convert Unix epoch timestamps to human-readable dates and back, in any timezone

SQL Formatter & Beautifier

Format, beautify, or minify SQL queries in 7 dialects — MySQL, PostgreSQL, T-SQL, and more

XML Formatter & Validator

Pretty-print, minify, and validate XML with error line numbers — CDATA and comments preserved

JSON Diff Checker

Compare two JSON documents structurally — added, removed, and changed values with exact paths

HTML Minifier & Beautifier

Minify HTML including inline CSS/JS, or beautify messy markup, with size savings shown

CSS Minifier & Beautifier

Minify stylesheets with CSSO or beautify compressed CSS, with byte and gzip savings shown

JavaScript Minifier & Beautifier

Minify JavaScript with Terser or beautify minified code, with byte savings shown instantly

Barcode Generator

Create CODE128, EAN-13, UPC-A, and 5 more barcode formats — download as SVG or PNG

Chmod Calculator

Convert Linux file permissions between rwx checkboxes, octal (755), and symbolic notation

IP Subnet Calculator

Get network, broadcast, host range, and masks from any IPv4 address and CIDR prefix

Cron Expression Builder

Build cron expressions visually with live plain-English output and next run times

Mock Data Generator

Generate realistic fake names, emails, dates, and UUIDs as JSON, CSV, or SQL INSERT statements

Disclaimer: A2ZKit's tools, calculators, cheat sheets, and articles are provided for general information and educational purposes only, on an "as is" basis without warranties of any kind. They are not financial, investment, tax, accounting, medical, health, or legal advice, and are not a substitute for a qualified professional. Results may be inaccurate or incomplete — verify independently and consult an appropriate professional before making any decision. Some tools process files — such as PDFs and images — entirely in your browser; you are responsible for keeping your own backups, and we are not liable for any data loss, file corruption, or inaccurate output. You use A2ZKit entirely at your own risk. By using the site you agree to our Terms of Service.