Number Base Converter Online — Free Binary, Hex, Octal, Decimal Converter | DevFlow
Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal and custom bases.
Free online number base converter supporting binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16), and custom bases (2-36). Features: BigInt support for arbitrary precision, two's complement for signed integers, interactive bit grid visualization, IEEE 754 float inspection, batch conversion mode, and real-time bidirectional conversion. Runs entirely in your browser — no data sent to servers. Supports 8/16/32/64-bit widths, big/little endian display, and prefix auto-detection (0x, 0b, 0o).
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How to Number Base Converter Online
Enter a number in the input field on the left — you can type it in decimal, hexadecimal, hex, octal, or binary format.
The tool auto-detects common prefixes: type '0xFF' for hex, '0b1010' for binary, or '0o377' for octal, or just enter a regular decimal number like '255'.
View instant conversions across all number bases simultaneously: decimal, binary, octal, and hexadecimal in the right panel.
Toggle 'Signed' mode to see two's complement representation for negative numbers, useful for understanding computer integer storage.
Adjust bit width (8, 16, 32, or 64 bits) to see how the number would be stored in different integer types, with visual bit grid representation.
Click on individual bits in the bit grid to toggle them — the value updates in real-time, making it easy to understand binary representation.
Switch to 'IEEE 754' mode to inspect how floating-point numbers are stored as 32-bit single or 64-bit double precision values.
Use 'Batch' mode to convert multiple numbers at once by entering one per line.
Copy any individual field value with the 'Copy' button, or use 'Copy All' (⌘⇧C) to copy all conversions at once.
Number Base Converter Features
Real-time bidirectional conversion: type in any field and see all other bases update instantly.
BigInt support for arbitrary precision — handles extremely large numbers without loss of accuracy.
Auto-detection of number prefixes (0x for hex, 0b for binary, 0o for octal) for seamless input.
Two's complement visualization for signed integers, showing how negative numbers are stored in computer memory.
Interactive bit grid: click any bit to toggle it and see how it affects the value across all bases.
Configurable bit widths: 8-bit (byte), 16-bit (short), 32-bit (int), and 64-bit (long) representations.
Endianness toggle (big-endian/little-endian) for understanding byte order in multi-byte values.
IEEE 754 floating-point inspector: decode 32-bit single and 64-bit double precision floats, showing sign bit, exponent, and mantissa.
Batch conversion mode: process multiple numbers at once for efficiency.
Client-side processing: all conversions happen in your browser — no data is sent to any server, ensuring complete privacy.
Shareable URLs: state persists in the URL so you can share your work with teammates.
Keyboard shortcuts: ⌘⇧K to clear all, ⌘⇧C to copy all, ⌘⇧S to toggle signed mode, ⌘⇧G to toggle bit grid visibility.
Frequently Asked Questions
- What is a number base?
- A number base (or radix) is the number of unique digits used to represent numbers in a positional numeral system. Decimal is base 10 (digits 0-9), binary is base 2 (0-1), octal is base 8 (0-7), and hexadecimal is base 16 (0-9, A-F). Programmers frequently convert between these bases when working with low-level code, memory addresses, and binary data.
- How do I convert binary to decimal?
- To convert binary to decimal, multiply each binary digit by 2 raised to the power of its position (from right to left, starting at 0), then sum the results. For example, binary '1010' equals (1×2³) + (0×2²) + (1×2¹) + (0×2⁰) = 8 + 0 + 2 + 0 = 10 in decimal. Our binary to decimal converter handles this instantly for any length number.
- What is two's complement?
- Two's complement is the most common method for representing signed integers in binary. It allows computers to perform addition and subtraction using the same circuitry. In two's complement, the most significant bit is the sign bit (0 for positive, 1 for negative). To find the negative of a number, invert all bits and add 1. Our converter shows two's complement representation when 'Signed' mode is enabled.
- How do I convert hexadecimal to binary?
- Each hexadecimal digit corresponds to exactly 4 binary digits (bits). Convert each hex digit to its 4-bit binary equivalent. For example, hex 'F' is '1111' in binary, hex 'A' is '1010', and '0x1A' becomes '00011010'. Our hex to binary converter handles this automatically for any length hex value.
- What is IEEE 754?
- IEEE 754 is the standard for floating-point arithmetic in computers. It defines how real numbers are stored as binary fractions with three components: a sign bit (1 bit), an exponent (8 bits for single precision, 11 bits for double precision), and a mantissa/significand (23 bits for single, 52 bits for double). Our IEEE 754 converter lets you inspect these bits and understand how floating-point values are represented.
- What is the difference between big-endian and little-endian?
- Endianness describes the byte order in which multi-byte values are stored in memory. Big-endian stores the most significant byte first (at the lowest memory address), while little-endian stores the least significant byte first. Most modern x86/x64 processors use little-endian, while network protocols (TCP/IP) use big-endian (also called network byte order).
- Can this converter handle very large numbers?
- Yes. Our number base converter uses JavaScript's BigInt type, which supports arbitrary-precision integers. This means you can convert numbers far larger than what standard 64-bit integers can hold — millions of digits — without losing precision. Simply paste your large number and watch it convert across all bases instantly.
- What's the difference between octal and hexadecimal?
- Octal (base 8) uses digits 0-7 and was commonly used in older computing systems (like Unix file permissions). Hexadecimal (base 16) uses digits 0-9 and letters A-F and is more space-efficient than octal (each hex digit represents 4 bits vs. 3 bits for octal). Hexadecimal is the standard for representing memory addresses, color codes (#FFFFFF), and binary data in modern computing.
- How do I use batch conversion mode?
- Switch to the 'Batch' tab in the mode selector, then enter one number per line in the input area. The tool will convert all numbers at once and display them in a table. You can copy the entire results or download them as CSV. This is useful for converting multiple values like RGB color codes, memory addresses, or sensor readings.
- Is my data private when using this converter?
- Absolutely. All number base conversions are performed entirely in your browser using JavaScript. Your numbers are never sent to any server, ensuring complete privacy. This makes our tool safe for converting sensitive data like encryption keys, memory dumps, or proprietary values.