Free Tools for Developers

chmod Calculator

• ·Set permissions visually with a GUI
• ·Convert between numeric and symbolic notation
• ·Live ls -la output preview

CIDR Calculator

• ·Instant subnet mask and host count
• ·AWS / GCP / Azure presets
• ·Subnet splitting and overlap check

Unix Timestamp Converter

• ·Convert between timestamp and datetime
• ·Get current time in one click
• ·Timezone support

UUID Generator

• ·Generate v1, v4, v7 UUIDs in bulk
• ·Format conversion and case toggle
• ·Copy multiple UUIDs at once

Hash Generator

• ·MD5, SHA-1, SHA-256, SHA-512 support
• ·Calculate file hash values
• ·HMAC generation

URL Encode/Decode

• ·Encode and decode Japanese parameters
• ·Parse query strings into key-value pairs
• ·Bulk convert and copy

Base64 Encoder/Decoder

• ·Convert text or files to Base64
• ·Full Japanese text support
• ·Image file preview on conversion

JSON Formatter

• ·Format, minify, and validate JSON
• ·Show schema errors with line numbers
• ·Copy minified JSON to clipboard

Password Generator

• ·Customize length and character types
• ·Real-time entropy display
• ·Specify characters to exclude