Free Online Utilities

Browser-based developer tools and utilities. Fast, private, and works offline. No data is sent to any server.

180 tools available 16 categories 100% client-side
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Data Format & Encoding

JSON, Base64, URL encoding, and data converters

JSON Formatter
Format, validate, and beautify JSON
Sample JSON Generator
Generate fake JSON data with nested structures
XML Formatter
Format, validate, and beautify XML
Base64 Encoder/Decoder
Encode and decode Base64 strings
URL Encoder/Decoder
Encode and decode URL components
HTML Entity Encoder
Convert special characters to HTML entities
JSON to CSV
Convert JSON arrays to CSV format
CSV to JSON
Convert CSV data to JSON format
YAML ↔ JSON Converter
Convert between YAML and JSON formats
JSON to TypeScript
Generate TypeScript interfaces from JSON
JSON to YAML
Convert JSON to YAML format
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Text Manipulation

Case converters, counters, and text transformations

Character Counter
Count words, characters, and sentences
Lorem Ipsum Generator
Generate placeholder text
Diff Checker
Compare text and find differences
Case Converter
Convert text to different cases
Slug Generator
Convert text to URL-friendly slugs
Text to ASCII Art
Convert text to ASCII art
Word Frequency Counter
Analyze word frequency in text
Reading Time Estimator
Calculate reading time for content
Line Number Adder
Add line numbers to text
Text Reverser
Reverse text by characters, words, or lines
List Sorter
Sort lists alphabetically or numerically
Duplicate Line Remover
Remove duplicate lines from text
Markdown to HTML
Convert Markdown to HTML with live preview
Text to Speech
Convert text to speech using Web Speech API
Text Diff Merger
Three-way merge tool with conflict resolution
Word Scrambler
Scramble and generate anagrams from text
Palindrome Checker
Check if text reads the same forwards and backwards
Text Statistics
Analyze readability with Flesch score, syllables, and more
Find and Replace
Advanced find and replace with regex support
Text Encryption
Encrypt text with Caesar, ROT13, AES, and more
Invisible Character Detector
Find zero-width spaces and hidden characters
Whitespace Normalizer
Clean tabs, spaces, and newlines
Random Text Generator
Generate random words, sentences, and paragraphs
Zalgo Text Generator
Create creepy glitchy cursed text
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Generators

UUID, passwords, QR codes, and more

UUID Generator
Generate UUID v1, v4, v5, v7
Password Generator
Create secure random passwords
QR Code Generator
Generate QR codes from text or URLs
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512
Password Strength Checker
Analyze password security and entropy
Sample CSV Generator
Generate CSV files with fake data
Barcode Generator
Generate CODE128, EAN, UPC, and more barcodes
🔐

Security & Encoding

Cryptographic tools, key generators, and security utilities

TOTP Generator
Generate time-based one-time passwords for 2FA
RSA Key Generator
Generate RSA public/private key pairs
SSL Certificate Decoder
View and analyze SSL/TLS certificate details
CSR Generator
Create Certificate Signing Requests
PEM to JWK Converter
Convert between PEM and JWK key formats
Bcrypt Hash Generator
Generate and verify bcrypt password hashes
HMAC Generator
Generate HMAC signatures with SHA-256/512
∑

Math & Conversion

Number converters, calculators, and unit tools

Number Base Converter
Convert binary, octal, decimal, hex
Unit Converter
Convert length, weight, temperature
Aspect Ratio Calculator
Calculate aspect ratios for images/video
Percentage Calculator
Calculate percentages, increases, decreases
Date Calculator
Calculate days between dates and add/subtract time
Timezone Converter
Convert times between different timezones
Bitwise Calculator
AND, OR, XOR, NOT, and shift operations
Scientific Calculator
Trig, log, factorial, and advanced math
Matrix Calculator
Matrix operations, determinant, inverse
Statistics Calculator
Mean, median, mode, standard deviation
Loan Calculator
EMI and amortization calculations
Compound Interest Calculator
Investment growth projections
BMI Calculator
Body mass index calculator
Tip Calculator
Calculate tips and split bills
Age Calculator
Exact age in years, months, days
Countdown Timer Generator
Embeddable countdown timers
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Developer Tools

Code formatting, regex testing, and dev utilities

Regex Tester
Test and debug regular expressions
Timestamp Converter
Convert Unix timestamps to dates
JWT Decoder
Decode and inspect JSON Web Tokens
Markdown Preview
Live preview Markdown content
Cron Expression Parser
Parse cron to human-readable format
Markdown Table Generator
Create Markdown tables visually
Meta Tag Generator
Generate SEO and social media meta tags
HTML Minifier
Minify HTML code to reduce file size
CSS Minifier
Minify CSS code to reduce file size
JavaScript Minifier
Minify JavaScript code to reduce file size
Code Screenshot Generator
Create beautiful code images with syntax highlighting
SQL Formatter
Format and beautify SQL queries
HTML to Markdown
Convert HTML to Markdown format
CSS Flexbox Generator
Visual flexbox layout builder
CSS Grid Generator
Visual CSS grid layout builder
JSON Schema Generator
Generate JSON Schema from JSON data
JSONPath Tester
Test JSONPath expressions on JSON data
XPath Tester
Test XPath expressions on XML data
GraphQL Query Builder
Visual GraphQL query builder
HTML Table Generator
Create HTML tables visually
Code Diff Viewer
Compare code side-by-side with highlighting
ESLint Config Generator
Generate ESLint configuration files
Prettier Config Generator
Generate Prettier configuration files
TypeScript to JavaScript
Strip TypeScript types and convert to JS
JSON to Go Struct
Generate Go structs from JSON
JSON to Python Class
Generate Python dataclasses from JSON
JSON to Java Class
Generate Java POJOs from JSON
CSS to Tailwind
Convert CSS to Tailwind classes
Tailwind to CSS
Convert Tailwind classes to vanilla CSS
HTTP Status Codes
Interactive HTTP status code reference
ASCII Table
Complete ASCII character reference
Keyboard Event Tester
Test JavaScript keyboard events
◉

Color Tools

Color pickers, converters, and palette generators

Color Converter
Convert HEX, RGB, HSL
Color Picker
Pick colors and convert formats
Contrast Checker
Check WCAG color contrast
Gradient Generator
Create CSS gradients visually
Box Shadow Generator
Create CSS box shadows visually
Border Radius Generator
Create CSS border radius visually
✦

Design & CSS

CSS generators, effects builders, and design tools

CSS Animation Generator
Create keyframe animations visually
CSS Filter Generator
Visual CSS filter effects builder
CSS Text Shadow Generator
Design text shadows with multiple layers
CSS Transform Generator
2D/3D transform builder with origin control
SVG Path Editor
Parse and visualize SVG path commands
SVG to CSS Background
Convert SVG to CSS data URI background
Color Palette Generator
Generate harmonious color schemes
Color Blindness Simulator
Preview colors for accessibility
Font Pairing Suggester
Find perfect Google Font combinations
Glassmorphism Generator
Create frosted glass CSS effects
Neumorphism Generator
Design soft UI shadow effects
Pattern Generator
Create CSS background patterns
Clip-Path Generator
Visual CSS clip-path shape builder
Cubic Bezier Generator
Create custom easing timing functions
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Image Tools

Image conversion, compression, and SVG utilities

Image to Base64
Convert images to Base64 strings
SVG Viewer
Preview and inspect SVG files
Image Compressor
Compress images to reduce size
Favicon Generator
Generate favicons from images
Placeholder Image Generator
Generate placeholder images with custom dimensions
📄

PDF Tools

Merge, split, rotate, and manipulate PDF files

Merge PDF
Combine multiple PDF files into one
Split PDF
Extract pages or split PDF into separate files
Rotate PDF
Rotate PDF pages by 90°, 180°, or 270°
Reorder PDF Pages
Drag and drop to rearrange PDF pages
Image to PDF
Convert images to PDF format
Markdown to PDF
Convert Markdown to PDF in your browser
PDF to Images
Convert PDF pages to PNG or JPEG images
PDF Watermark
Add text watermarks to PDF documents
PDF Page Extractor
Extract specific pages from PDF files
PDF Compress
Reduce PDF file size by optimizing content
PDF Metadata Editor
View and edit PDF document properties
🖼️

Image & Media

Image manipulation, conversion, and media processing tools

Image Cropper
Crop images to specific aspect ratios
Image Resizer
Resize images by pixels or percentage
Image Format Converter
Convert between PNG, JPEG, WebP, GIF, BMP
Image Color Extractor
Extract dominant colors from images
Sprite Sheet Generator
Combine images into sprite sheets with CSS
Image Metadata Viewer
View EXIF data and photo information
Image Watermark
Add text or image watermarks to photos
GIF Frame Extractor
Extract individual frames from animated GIFs
Image to ASCII
Convert images to ASCII art
Image Pixelator
Create retro pixel art effects
Image Filter Applier
Apply grayscale, sepia, blur, and more filters
Screenshot Mockup Generator
Place screenshots in device frames
Icon Set Preview
Preview and organize SVG icon collections
⬡

Diagrams & Visualization

Create flowcharts, diagrams, and visual representations

Mermaid Diagram Editor
Create flowcharts, sequences, and diagrams with Mermaid
⚡

Network & Web

URL parsing, headers, security configuration, and web tools

URL Parser
Parse and analyze URL components
robots.txt Generator
Generate robots.txt files for your website
IP Address Info
View your IP address, browser, and connection details
User Agent Parser
Parse and analyze browser user agent strings
Cookie Editor
View, create, edit, and delete browser cookies
Local Storage Viewer
View and manage localStorage and sessionStorage
CORS Header Generator
Generate Cross-Origin Resource Sharing headers
CSP Header Generator
Build Content Security Policy headers
.htaccess Generator
Generate Apache .htaccess rules for redirects and security
Sitemap Generator
Create XML sitemaps for search engine indexing
📊

SEO & Marketing

Meta tags, structured data, and search optimization tools

Open Graph Preview
Preview content on Facebook, LinkedIn, Discord
Twitter Card Preview
Preview Twitter/X card appearance
Schema.org Generator
Generate JSON-LD structured data
Canonical URL Generator
Prevent duplicate content with canonical tags
Hreflang Generator
International SEO language tags
Keyword Density Analyzer
Analyze keyword frequency for SEO
⏱️

Productivity

Timers, task management, and organization tools

Pomodoro Timer
Focus timer with work sessions and breaks
Kanban Board
Visual task board with drag and drop
Sticky Notes
Virtual sticky notes for quick reminders
Checklist Generator
Create shareable checklists
Meeting Notes Template
Generate structured meeting notes
Invoice Generator
Create professional invoices
🎲

Fun & Miscellaneous

Random generators, converters, and fun utilities

Emoji Picker
Search and copy emojis
Fake Data Generator
Generate fake names, emails, addresses, phones
Random Number Generator
Generate random numbers with various distributions
Dice Roller
Roll virtual dice (D4, D6, D8, D10, D12, D20, D100)
Coin Flipper
Flip a virtual coin with statistics
Decision Wheel
Spin a wheel to make random decisions
Color Name Finder
Find the closest named color for any value
Morse Code Converter
Convert text to Morse code with audio
Binary Translator
Convert text to binary and back
Phonetic Alphabet Converter
Convert text to NATO phonetic alphabet
Roman Numeral Converter
Convert between numbers and Roman numerals

Your Privacy Matters

All utilities run entirely in your browser. Your data never leaves your device, making these tools safe for sensitive information.

✓ No server uploads ✓ Works offline ✓ No tracking ✓ No signup required