The creator's toolbox
A comprehensive collection of free utilities for developers, designers, writers, and creators. No installation. No signup. No data sent to servers.
Tools for Every Creator
From code to design to writing. We're building tools for every type of creator.
All Tools
Browse our complete collection of free tools.
Developer Tools
JSON Formatter
Format, validate, and beautify JSON
Base64 Encoder
Encode and decode Base64 text and files
URL Encoder
Encode and decode URLs
JWT Decoder
Decode JSON Web Tokens
Hash Generator
Generate MD5, SHA-256 hashes
CIDR Calculator
Calculate network ranges from CIDR notation
Cron Parser
Parse cron expressions and find next runs
HTML Encoder
Encode and decode HTML entities
JSON to CSV
Convert JSON data to CSV format
JSON to TypeScript
Generate TypeScript interfaces from JSON
JSON Validator
Validate JSON syntax and structure
JSONPath Tester
Test JSONPath expressions
Markdown to HTML
Convert Markdown to HTML
MIME Type Checker
Find MIME types from file extensions
Regex Tester
Test regular expressions
Slug Generator
Generate URL-friendly slugs
SQL Formatter
Format and beautify SQL queries
Timestamp Converter
Convert between Unix timestamps and dates
URL Parser
Parse and extract URL components
User Agent Parser
Parse browser user agent strings
UUID Generator
Generate UUIDs v1, v4, and v7
XML Formatter
Format and beautify XML
XPath Tester
Test XPath expressions on XML
YAML to JSON
Convert YAML to JSON
Designer Tools
Color Converter
Convert between HEX, RGB, HSL
Image to Base64
Convert images to Base64 data URLs
Box Shadow
Generate CSS box shadows
Gradient Generator
Create CSS gradients
Aspect Ratio
Calculate aspect ratios for images and video
Border Radius
Preview CSS border radius
Contrast Checker
Check color contrast ratios
Favicon Generator
Generate favicons from images
CSS Filter Playground
Preview CSS filter effects
Flexbox Playground
Interactive CSS flexbox layout tool
Font Converter
Convert between font formats
Glassmorphism Generator
Create glassmorphism effects
CSS Grid Generator
Generate CSS grid layouts
Image Converter
Convert images between formats
Image Resizer
Resize images to specific dimensions
Line Height
Preview and adjust line height
Image Metadata Viewer
View EXIF and image metadata
Color Palette Extractor
Extract colors from images
SVG Optimizer
Minify and clean SVG code
Writer Tools
Word Counter
Count words, characters, reading time
Case Converter
Convert between text cases
Markdown Preview
Live markdown editor and preview
Lorem Ipsum
Generate dummy text
Citation Generator
Generate APA, MLA, Chicago citations
Duplicate Remover
Remove duplicate lines from text
Headline Analyzer
Analyze headline quality and SEO
Link Extractor
Extract URLs from text
Passive Voice Detector
Find passive voice in text
Random Picker
Randomly pick from a list
Reading Level
Check Flesch-Kincaid reading level
Reading Time
Estimate reading time for text
Sentence Length
Analyze sentence length distribution
Sort Lines
Sort lines alphabetically or reverse
Text Summarizer
Summarize text using extraction
Whitespace Remover
Remove extra spaces and tabs
Word Frequency
Count word occurrences
Calculator Tools
Unit Converter
Convert length, weight, temperature
Percentage Calculator
Calculate percentages easily
Password Generator
Generate secure passwords
Text Diff
Compare two texts
Age Calculator
Calculate age from birthdate
Base Converter
Convert between number bases
BMI Calculator
Calculate Body Mass Index
Credit Card Validator
Validate credit card numbers
Date Difference
Calculate days between dates
Discount Calculator
Calculate sale prices and savings
Fraction Calculator
Add, subtract, multiply fractions
Hash Generator
Generate various hashes
Loan Calculator
Calculate loan payments
Number to Words
Convert numbers to text
Quadratic Solver
Solve quadratic equations
Random Number
Generate random numbers
Roman Numeral
Convert to/from Roman numerals
Timezone Converter
Convert between timezones
Tip Calculator
Calculate tips and split bills
Office Tools
Barcode Generator
Generate barcodes (Code128, EAN)
Batch Rename
Rename multiple files at once
Business Card Designer
Design simple business cards
Compress Image
Reduce image file size
Compress PDF
Reduce PDF file size
Crop Image
Crop images to any size
Decrypt PDF
Remove password from PDFs
Encrypt PDF
Password protect PDFs
Extract PDF Images
Extract images from PDF files
Extract PDF Pages
Extract specific pages from PDF
File Info
Get file metadata and details
Image Format Converter
Convert between PNG, JPG, WebP
Image to Grayscale
Convert images to black and white
Image to PDF
Convert images to PDF
Image Watermark
Add watermarks to images
Invoice Generator
Create simple invoices
Merge PDFs
Combine multiple PDFs
PDF to Images
Convert PDF pages to images
PDF to Text
Extract text from PDFs
PDF Watermark
Add watermarks to PDFs
QR Code Generator
Generate QR codes
Reorder PDF Pages
Change page order in PDFs
Resize Image
Resize images to specific dimensions
Rotate Image
Rotate images by degrees
Rotate PDF Pages
Rotate PDF pages
Split PDF
Split PDF into separate files
Why 9kit?
Built for creators who value speed, privacy, and simplicity.
Lightning Fast
Zero latency. All tools run instantly in your browser with no server delays.
100% Private
Your data never leaves your device. No tracking, no logs, no data collection.
100+ Tools
A comprehensive collection of tools for developers, designers, and writers.
One kit. All your tools.
Our vision is simple: create the most comprehensive, privacy-focused toolbox for creators of all kinds.