Free Online Developer Toolbox
76+ free tools for encoding, encryption, text, image, PDF, CSS, network, math. No signup needed.
Popular Tools
Base64 Encoder/Decoder
Encode and decode text and files to Base64
Hash Calculator
MD5, SHA, RIPEMD, BLAKE hash algorithms
Symmetric Encryption
AES, DES, 3DES, ChaCha20 encryption and decryption
JWT Tool
JWT decode, verify, create and sign
Password Generator
Secure random password generation with custom rules
JSON Workbench
JSON format, validate, tree edit, JSONPath query
Regex Tester
Real-time regex matching with highlighted groups
Text Diff
Compare two texts with highlighted differences
Image Compress
Browser-side image compression, batch support
Image Format Convert
Convert between PNG, JPG, WebP, SVG
Image Base64
Convert between images and Base64
QR Code
QR code generation and decoding, full customization
Color Picker
Image color picker, screen picker, palette, accessibility check
Cron Expression
Cron expression generator and parser with execution preview
UUID Generator
UUID v1/v4/v5 batch generation
Color Converter
HEX, RGB, HSL, HSV, CMYK conversion with alpha
Timestamp Tool
Timestamp conversion, formatting, timezone, date calculation
Gradient Generator
Visual CSS gradient code generator
IP Lookup
IP address geolocation and ISP lookup
Scientific Calculator
Scientific calculator with math functions
Unit Converter
Length, weight, temperature, area unit conversion
PDF Merge
Merge multiple PDF files into one
Markdown Editor
Full-featured Markdown editor with live preview
WiFi QR Code
Generate WiFi connection QR code
NEWNew Tools
Password Hash
bcrypt, scrypt, Argon2, PBKDF2 password hashing
Symmetric Encryption
AES, DES, 3DES, ChaCha20 encryption and decryption
Asymmetric Encryption
RSA, ECC encryption, decryption, signing and verification
Digital Signature
RSA, ECDSA, Ed25519 digital signatures
TOML Formatter
TOML format, validate, convert to/from JSON
Image Crop
Visual image cropping with multiple ratios
All Categories
All Tools
Base64 Encoder/Decoder
Encode and decode text and files to Base64
URL Encoder/Decoder
Encode and decode URL strings, batch support
HTML Entity Encoder
Encode and decode HTML entity characters
Unicode Encoder
Convert between Unicode, UTF-8, and HTML entities
Radix Converter
Convert between binary, octal, decimal, hex and custom radix
Hash Calculator
MD5, SHA, RIPEMD, BLAKE hash algorithms
Password Hash
bcrypt, scrypt, Argon2, PBKDF2 password hashing
Symmetric Encryption
AES, DES, 3DES, ChaCha20 encryption and decryption
Asymmetric Encryption
RSA, ECC encryption, decryption, signing and verification
HMAC Generator
HMAC message authentication code generation
JWT Tool
JWT decode, verify, create and sign
Digital Signature
RSA, ECDSA, Ed25519 digital signatures
Password Generator
Secure random password generation with custom rules
JSON Workbench
JSON format, validate, tree edit, JSONPath query
XML Formatter
XML format, compress, validate
YAML Formatter
YAML format, validate, convert to/from JSON
SQL Formatter
SQL statement formatting and compression
TOML Formatter
TOML format, validate, convert to/from JSON
Regex Tester
Real-time regex matching with highlighted groups
Text Diff
Compare two texts with highlighted differences
Case Converter
Convert between uppercase, lowercase, camelCase, snake_case
Word Counter
Count words, characters, lines, and paragraphs
Image Compress
Browser-side image compression, batch support
Image Format Convert
Convert between PNG, JPG, WebP, SVG
Image Crop
Visual image cropping with multiple ratios
Image Resize
Resize images by pixels or percentage
Image Rotate/Flip
Rotate any angle, flip horizontal/vertical
Image Filter
Grayscale, blur, sharpen, brightness, contrast filters
Image Watermark
Text or image watermark with custom position
Image Base64
Convert between images and Base64
Image EXIF
View and remove image EXIF metadata
Image Compare
Before/after slider comparison
QR Code
QR code generation and decoding, full customization
Barcode
EAN-13, Code128, UPC barcode generation
Color Picker
Image color picker, screen picker, palette, accessibility check
Background Remover
Remove solid color backgrounds
Cron Expression
Cron expression generator and parser with execution preview
UUID Generator
UUID v1/v4/v5 batch generation
Color Converter
HEX, RGB, HSL, HSV, CMYK conversion with alpha
Timestamp Tool
Timestamp conversion, formatting, timezone, date calculation
JSON ↔ CSV
Convert between JSON and CSV
Markdown ↔ HTML
Convert between Markdown and HTML
Code Highlight
Multi-language code highlighting
CSS Minify/Beautify
CSS code minification and formatting
Gradient Generator
Visual CSS gradient code generator
Shadow Generator
Visual box-shadow code generator
Flexbox Generator
Visual Flexbox layout generator
Grid Generator
Visual CSS Grid layout generator
IP Lookup
IP address geolocation and ISP lookup
UA Parser
User-Agent string parser
HTTP Status Codes
HTTP status code reference
DNS Lookup
Domain DNS record lookup
SSL Certificate Check
View SSL certificate details
Scientific Calculator
Scientific calculator with math functions
Unit Converter
Length, weight, temperature, area unit conversion
Percentage Calculator
Percentage calculation
Loan Calculator
Equal principal and interest loan calculation
BMI Calculator
Body Mass Index calculator
Amount to Chinese
Convert number to Chinese uppercase amount
PDF Merge
Merge multiple PDF files into one
PDF Split
Split PDF by pages
PDF Compress
Compress PDF file size
PDF to Image
Convert PDF pages to PNG or JPG
Image to PDF
Convert images to PDF
Excel ↔ JSON
Convert between Excel/CSV and JSON
Table Converter
Convert between CSV, TSV, JSON, Markdown tables
Markdown Editor
Full-featured Markdown editor with live preview
Meta Tag Generator
Generate SEO meta tags
robots.txt Generator
Generate robots.txt file
Open Graph Generator
Generate social sharing Open Graph tags
vCard QR Code
Generate vCard contact QR code
WiFi QR Code
Generate WiFi connection QR code
Text to Speech
Browser-based text to speech
JSON Visualizer
JSON data tree visualization
Regex Visualizer
Regex railroad diagram visualization
Text to Image
Generate beautiful images from text