sitekits.dev
A growing toolkit for web developers, SREs, and security engineers. Most tools run entirely in your browser. No accounts, no tracking by default.
Command palette (⌘K / Ctrl+K) — coming in the new UI.
Focus areas
format
JSON Formatter / Validator
Format, validate, and minify JSON data instantly.
XML Formatter & Minifier
Format or minify XML documents with customizable indentation.
SQL Formatter & Minifier
Beautify or minify SQL queries for better readability.
HTML Formatter & Minifier
Beautify or minify HTML code with proper indentation.
CSS Formatter & Minifier
Beautify or minify CSS stylesheets.
JavaScript Formatter & Minifier
Beautify or minify JavaScript code.
JSON ↔ YAML Converter
Convert data between JSON and YAML formats.
Code Cleaner
Remove comments, blank lines, and trailing whitespace from code.
YAML Validator
Validate YAML syntax and view the parsed result.
convert
IPv4 Address Converter
Convert IPv4 addresses between different formats.
IPv6 Address Compressor
Compress and expand IPv6 addresses.
IDN / Punycode Converter
Convert between Unicode domain names and Punycode.
Base64 Encode / Decode
Encode or decode Base64 strings with full UTF-8 support.
Number Base Converter
Convert numbers between different bases.
Image to Data URI Converter
Convert between images and Data URI encoding.
Unix Time Converter
Convert between Unix timestamps and human-readable dates.
JSON ↔ YAML Converter
Convert data between JSON and YAML formats.
XML ↔ JSON Converter
Convert data between XML and JSON formats.
XML to YAML Converter
Convert XML documents to YAML format.
CSV to SQL Converter
Generate SQL CREATE TABLE and INSERT statements from CSV data.
JSON to Code Generator
Generate class definitions from JSON in multiple languages.
SQL to MongoDB Query Converter
Convert SQL queries to MongoDB query syntax.
INI to XML/YAML Converter
Convert INI files to XML or YAML format.
XML to XSD Schema Generator
Generate XSD schema definitions from XML.
Data Unit Converter
Convert between data storage and transfer units.
Timezone Converter
Convert time between different world timezones.
encode
Base64 Encode / Decode
Encode or decode Base64 strings with full UTF-8 support.
URL Encode / Decode
Encode or decode URL components with percent-encoding.
Hash Generator
Generate cryptographic hashes (SHA-1, SHA-256, SHA-512) from text.
HTML Entity Encoder & Decoder
Encode and decode HTML entities.
JavaScript Hex String Escape
Escape and unescape JavaScript hex string sequences.
XML String Escaper
Escape and unescape XML special characters.
Number Base Converter
Convert numbers between different bases.
Image to Data URI Converter
Convert between images and Data URI encoding.
JWT Token Decoder
Decode and inspect JSON Web Tokens.
generate
Password Generator
Generate secure random passwords with custom length and character options.
UUID v4 Generator
Generate cryptographically random UUID v4 identifiers.
Content Security Policy Generator
Generate Content-Security-Policy headers.
JSON to Code Generator
Generate class definitions from JSON in multiple languages.
Crontab Expression Editor
Parse crontab expressions and preview next scheduled runs.
Random JSON Data Generator
Generate random JSON test data.
Lorem Ipsum Generator
Generate placeholder text for designs and layouts.
QR Code Generator
Free QR code generator. Customize colors, size, and error correction level.
validate
JSON Formatter / Validator
Format, validate, and minify JSON data instantly.
XML to XSD Schema Generator
Generate XSD schema definitions from XML.
Regular Expression Tester
Test and debug regular expressions with live matching.
XPath Expression Tester
Test XPath expressions on XML documents.
YAML Validator
Validate YAML syntax and view the parsed result.
HTML Validator
Validate HTML for common errors and best practices.
JavaScript Syntax Validator
Validate JavaScript syntax for errors.
network
IP Address Checker
View your current IP address and network information.
DNS Lookup Tool
Query DNS records for any domain instantly.
HTTP Headers Checker
Inspect HTTP response headers and security posture of any URL.
IPv4 Subnet Calculator
Calculate IPv4 subnet details and address ranges.
IPv6 Subnet Calculator
Calculate IPv6 subnet details and address ranges.
IPv4 Address Converter
Convert IPv4 addresses between different formats.
IPv6 Address Compressor
Compress and expand IPv6 addresses.
IDN / Punycode Converter
Convert between Unicode domain names and Punycode.
Website Bandwidth Calculator
Estimate website bandwidth requirements.
Download Time Calculator
Estimate download time for any file size.
HAR File Viewer
View and analyze HAR file contents.
text
Markdown Preview
Write and preview Markdown with live rendering.
Text Diff Checker
Compare two texts and visualize the differences line by line.
Regular Expression Tester
Test and debug regular expressions with live matching.
JSONPath Evaluator
Evaluate JSONPath expressions on JSON data.
XPath Expression Tester
Test XPath expressions on XML documents.
Code Cleaner
Remove comments, blank lines, and trailing whitespace from code.
Lorem Ipsum Generator
Generate placeholder text for designs and layouts.
String Case Converter
Convert string case and perform text transformations.
Word & Character Counter
Count words, characters, lines, and more.
image
Color Picker — HEX, RGB, HSL
Pick any color and get HEX, RGB, HSL values with tints, shades, and harmonies.
SVG Viewer & Renderer
View and render SVG images from code or file upload.
Color Code Extractor
Extract hex, RGB, and HSL color codes from text.
Image to Data URI Converter
Convert between images and Data URI encoding.
QR Code Generator
Free QR code generator. Customize colors, size, and error correction level.
time
Download Time Calculator
Estimate download time for any file size.
Unix Time Converter
Convert between Unix timestamps and human-readable dates.
Timezone Converter
Convert time between different world timezones.
Crontab Expression Editor
Parse crontab expressions and preview next scheduled runs.
ICS Calendar Viewer
View and parse ICS calendar file contents.