BitShell - Binary, Hex & Base64 Converter

BitShell is a fast, fully offline conversion tool for developers, security researchers, students, and system administrators who work with encodings and number systems daily. No websites. No tracking. No data ever leaves your machine. Key Features Universal Conversion - Binary (0b) - Hexadecimal (0x) - Decimal (ints and floats) - UTF-8 text - Base64 encode/decode - IPv4 and IPv6 support - IPv4 subnet / CIDR calculator Smart Detection - Auto-detects IPv4 and IPv6 addresses - Auto-detects CIDR notation (e.g. 14.12.72.8/24) and switches to subnet mode - Real-time validation - Helpful error suggestions - Character and byte counters Blazing Fast and Private - Instant conversions as you type - Handles up to 100,000 characters - No server calls — 100% offline - No tracking, analytics, or data collection Copy and History Tools - One-click copy for any format - Copy all formats at once - Visual copy confirmation - History of your last 50 conversions, including subnet calculations Customizable Settings - Adjustable font size - Binary grouping (4/8/16 bits) - Hex grouping (1–4 bytes) - Prefix toggles (0b, 0x) - Upper/lowercase hex - Leading-zero control Keyboard Shortcuts - Ctrl/Cmd + K — Clear input - Ctrl/Cmd + Enter — Copy all - Ctrl/Cmd + H — Toggle history - Ctrl/Cmd + , — Settings - Escape — Close sidebars Terminal-Inspired UI - Clean, distraction-free layout - Solarized dark theme - Smooth transitions and professional monospace fonts Perfect For - Developers - Security researchers - Students learning binary, hex, and networking - Sysadmins and network engineers - Reverse engineers and protocol analysts Common Use Cases - Calculate subnet ranges, host counts, and network addresses from CIDR notation - Convert IP addresses between formats - Decode Base64 strings - Convert hex color codes - Analyze packet capture data - Switch between number bases for coding - Encode/decode text for web development Recent Updates (v1.0.6) - New: IPv4 subnet / CIDR calculator — type any CIDR address (e.g. 200.107.16.17/18) to instantly see IP in binary, subnet mask, network address, broadcast address, first/last host, address count, and max hosts - CIDR is auto-detected as you type — no extra tab or button needed - CIDR results fully supported in copy, copy all, and history - Fixed hex prefix display for multi-byte binary and decimal inputs - Fixed leading zeros on space-separated decimal-to-binary conversion - Improved bit and byte counter accuracy for decimal and fractional binary inputs - Fixed decimal float text conversion to show clear error instead of silent output - Code cleanup and performance improvements - Added a pop-out button for a resizable window Technical Details - Works fully offline - Uses Chrome Storage API - Context-menu integration - Supports arbitrarily large integers via BigInt - UTF-8 text support - Robust error handling Why BitShell? Most online converters require internet access and track your data. BitShell is different: - Offline anywhere - Zero data collection - Instant performance - Professional-grade tools - Clean, focused interface Support and Feedback Found a bug or want a new feature? Reach out through the support link. BitShell improves with your feedback. Privacy BitShell does not collect personal data, track usage, send data to servers, or use analytics. All settings and history stay on your device only.