Developer tools
Curated online tools, organized by category for easy discovery
tools
ASCII Table
View ASCII table in decimal and hexadecimal
Password Strength Checker
Real-time password strength analysis with security score and tips. 100% local, never uploaded.
CSS Box Shadow Generator
Visually generate CSS box-shadow with offset, blur, spread, color and inset. Copy code.
ROT13 Cipher
ROT13 is a symmetric letter-substitution cipher for simple encoding and decoding.
Border Radius Generator
Visually generate CSS border-radius with independent corner control and copy code.
Timestamp Converter
Online Unix timestamp and date conversion tool, supporting second/millisecond timestamps, displaying multi-timezone time and relative time.
SQL Formatter
Beautify, minify and convert SQL keyword case with syntax highlighting.
Color Palette Generator
Generate complementary, analogous, and triadic color palettes
Hash Generator
An online hash value generation tool that supports algorithms such as MD5, SHA1, SHA256, SHA512, and can generate hash values for strings or files.
Color Picker
Online color picker, supports conversion between HEX, RGB, HSL formats
Base64 Encoding and Decoding
Base64 encoding and decoding tool, supporting strings and files
HTTP Status Codes
Look up HTTP status codes and their meanings
JS Formatter & Minifier
Online JavaScript formatting and minification tool, supports ES6+ syntax, one-click beautify/minify JS code, can detect syntax errors.
Caesar Cipher
Caesar cipher encoder/decoder with custom shift. Classic substitution cipher with brute-force all shifts.
XML Formatter
Beautify XML code with proper indentation
UUID Generator
Online UUID generation tool, supports UUID v1 and v4 versions, can generate multiple UUIDs in batches, one-click copy, suitable for developers for quick use.
Subnet Calculator
Calculate network address, broadcast, usable hosts and mask from IP and CIDR prefix.
URL Encoder/Decoder Tool
Online URL encoding and decoding tool, supporting encodeURIComponent and decodeURIComponent operations, helping developers quickly process URL parameters.
Aspect Ratio Calculator
Resize dimensions while keeping the aspect ratio, with a visual preview
Email Validator
Validate email address format online. Support batch validation with detailed results and suggestions.
MAC Address Generator
Generate random MAC addresses in bulk with custom OUI prefix and format.
JSON Formatter
Online JSON formatting, validation, and compression tool, supporting syntax highlighting and tree view
HTML Entity Encoder/Decoder
Online HTML entity encoding/decoding tool, supports escaping and unescaping of all HTML special characters to prevent XSS attacks.
Chmod Calculator
Pick read/write/execute bits and get the octal mode plus the chmod command
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About these online tools
Every tool listed here runs directly in your browser — no installation and no sign-up required. Text editing, image processing, PDF handling, format conversion, developer utilities and AI writing helpers are grouped by use case so you can find what you need in seconds. Tools that handle files do all the work locally: your files are never uploaded to a server.
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