Free Developer Tools & Tutorials

Fast, free utilities and in-depth IT guides. No signup, no tracking — just paste and go.

Formatters

Format and beautify your code instantly

{ }

JSON Formatter

Format & validate JSON

.*

Regex Tester

Test regex patterns

MD

Markdown Preview

Preview Markdown live

SQL

SQL Formatter

Format SQL queries

XML

XML Formatter

Format & validate XML

HTML

HTML Formatter

Format & beautify HTML

JS

JavaScript Beautifier

Beautify or minify JS

CSS

CSS Beautifier

Beautify or minify CSS

Encoders & Decoders

Encode, decode, and hash data

B64

Base64 Encode/Decode

Encode & decode Base64

JWT

JWT Decoder

Decode JWT tokens

%

URL Encode/Decode

Encode & decode URLs

&;

HTML Entity Encoder

Encode/decode HTML entities

#!

Hash Generator

Generate MD5/SHA hashes

SSL

Certificate Details Viewer

Inspect SSL certificates

HMAC

HMAC Generator

Generate HMAC signatures

JS\

JavaScript Escape

Escape JS strings

J\

JSON Escape

Escape JSON strings

X\

XML Escape

Escape XML characters

SQL\

SQL Escape

Escape SQL strings

CSV\

CSV Escape

Escape CSV fields

Generators

Generate UUIDs, lorem ipsum, and more

CLK

Cron Expression Generator

Build cron expressions

ID

UUID Generator

Generate UUIDs

Aa

Lorem Ipsum Generator

Generate placeholder text

PWD

Password Generator

Generate secure passwords

QR

QR Code Generator

Generate QR codes

Converters

Convert between data formats

CSV

JSON to CSV Converter

Convert JSON to CSV

T

Unix Timestamp Converter

Convert timestamps

#

Color Converter

Convert color formats

YML

YAML to JSON Converter

Convert YAML & JSON

X→J

XML to JSON Converter

Convert XML to JSON

J→X

JSON to XML Converter

Convert JSON to XML

C→J

CSV to JSON Converter

Convert CSV to JSON

C→X

CSV to XML Converter

Convert CSV to XML

URL

URL Parser

Parse URL components

Validators

Validate formats, expressions, and data

✓H

HTML Validator

Validate HTML markup

XP

XPath Tester

Test XPath expressions

CC

Credit Card Validator

Validate credit card numbers

Networking

IP, MAC, and network utility tools

SUB

IPv4 Subnet Calculator

Calculate IPv4 subnets from CIDR

IP4

IPv4 Address Converter

Convert IPv4 between decimal, binary, hex

RNG

IPv4 Range Expander

Expand CIDR or IP range to address list

OUI

MAC Address Lookup

Look up MAC address vendor/OUI

MAC

MAC Address Generator

Generate random MAC addresses

IP6

IPv6 ULA Generator

Generate IPv6 ULA prefixes (RFC 4193)

Latest Tutorials

Learn IT fundamentals with clear, practical guides

View all tutorials →
DNSbeginner

How DNS Works

Understand the Domain Name System from root servers to your browser. Learn about DNS resolution, record types, caching, and troubleshooting.

Networking·8 min read
HTTPbeginner

HTTP Status Codes Explained

A complete guide to HTTP response status codes. Learn what 200, 301, 404, 500, and other codes mean with real-world examples.

Web Development·10 min read
TLSintermediate

SSL/TLS Handshake Deep Dive

Learn how HTTPS connections are established. Understand the TLS handshake, certificates, cipher suites, and how encryption protects your data.

Security·12 min read

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Built by developers, for developers. Clean interfaces, keyboard-friendly, dark mode included.