Number base converter. Convert between binary, octal, decimal, and hexadecimal number systems with real-time updates, fractional support, and
100% browser-based — your data never leaves your device
Convert between binary, octal, decimal, and hexadecimal number systems.
Enter a value in binary, octal, decimal, or hexadecimal. All other fields update instantly.
Enable bit-length display to see binary padded to 8, 16, 32, or 64 bits.
Click the copy button next to any base to copy that representation.
Ctrl+Enter to convert
Convert length, weight, temperature, area, and volume units.
Number Base ConverterConvert between binary, octal, decimal, and hexadecimal number systems.
Percentage CalculatorCalculate percentages easily with three common modes.
Chmod CalculatorConvert Unix file permissions between numeric and symbolic formats.
Random Number GeneratorGenerate cryptographically secure random numbers with custom ranges and count.
Scientific CalculatorPerform scientific calculations with trigonometric, logarithmic, and exponential functions.
Number Base Converter is a free online math tool that convert between binary, octal, decimal, and hexadecimal number systems. It works entirely in your browser — no downloads, no installations, and no server uploads required. engineers, data scientists, students use Number Base Converter when they need a fast, privacy-respecting way to process math data without installing additional software. It supports capabilities such as all bases, real-time, fraction support. Additional features include bit length. Common use cases include converting between decimal, binary, and hexadecimal for low-level programming, decoding hex color values and memory addresses in debugging sessions, understanding binary and octal representations in unix file permissions. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes Number Base Converter ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
Number Base Converter is a free online math tool that helps you convert between binary, octal, decimal, and hexadecimal number systems. Key capabilities include all bases, real-time, fraction support. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to converting between decimal, binary, and hexadecimal for low-level programming.
Enter a value in binary, octal, decimal, or hexadecimal. All other fields update instantly.
Enable bit-length display to see binary padded to 8, 16, 32, or 64 bits.
Click the copy button next to any base to copy that representation.
| Category | Details |
|---|---|
| Input Limits | Numeric precision: 64-bit IEEE 754 (double) |
| Result precision: Up to 16 significant digits | |
| Supported Formats | Decimal, Hexadecimal, Binary, Octal, Scientific notation |
| Browser Engine |
|
All operations run entirely in your browser using built-in Math APIs. No server uploads, no data storage, and no third-party requests.
Number Base Converter is ideal when you need to converting between decimal, binary, and hexadecimal for low-level programming without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For one-off tasks and quick processing, Number Base Converter is faster than setting up a local development environment or using a command-line tool.
No. Number Base Converter processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
Type any decimal number in the Decimal field, and the binary equivalent appears instantly in the Binary field. All bases update simultaneously as you type.
Binary (base-2), Octal (base-8), Decimal (base-10), and Hexadecimal (base-16) are all supported with real-time conversion between all bases.
Convert between binary (2), octal (8), decimal (10), and hexadecimal (16).
All bases update simultaneously as you type in any one field.
Convert fractional numbers with decimal point support.
See binary padded to 8, 16, 32, or 64 bits.
Number Base Converter is useful in a variety of scenarios across different workflows:
Converting between decimal, binary, and hexadecimal for low-level programming
Decoding hex color values and memory addresses in debugging sessions
Understanding binary and octal representations in Unix file permissions
Type a number in any base field and all other bases update in real-time. Use this to learn the relationships between number systems.
Enable bit-length display to see binary padded to 8, 16, 32, or 64 bits for understanding fixed-width integer representations.
Explore more tools in the Math workspace:
Unit Converter
Convert length, weight, temperature, area, and volume units.
Percentage Calculator
Calculate percentages easily with three common modes.
Chmod Calculator
Convert Unix file permissions between numeric and symbolic formats.
Random Number Generator
Generate cryptographically secure random numbers with custom ranges and count.
Scientific Calculator
Perform scientific calculations with trigonometric, logarithmic, and exponential functions.