multi-tools.jp
A collection of free online tools. Everything runs in your browser โ no data is sent to any server.
21 tools available
Conversion
UNIX Timestamp Converter
Convert between UNIX timestamps and human-readable dates
Base Converter
Convert numbers between bases (2โ36)
ASCII / HEX Converter
Convert between ASCII strings and hexadecimal
Color Converter
Convert between HEX / RGB / HSL and other color formats
Image Format Converter
Convert image files to different formats
CSV / JSON Converter
Convert between CSV and JSON formats
Unit Converter
Convert between various units of measurement
Calculation
Bitwise Logic Calculator
Perform bitwise logical operations
IP Address CIDR Calculator
Calculate network information from IPv4/IPv6 address and CIDR
Regex Tester
Test regular expressions with real-time matching and capture groups
Cron Expression Parser
Parse cron expressions and show next execution times
Text Diff Checker
Compare differences between two texts
Encoding
Generation
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 and other hash values
UUID Generator
Generate UUIDs of various versions
ULID Generator
Generate Universally Unique Lexicographically Sortable Identifiers
Password Generator
Generate cryptographically secure random passwords
QR Code Generator
Generate QR codes from text or URLs