Number Base Converter
Number Base Converter is a free online tool that instantly converts any number between Decimal (Base 10), Binary (Base 2), Hexadecimal (Base 16), and Octal (Base 8) — all at once, in real time. Perfect for students, programmers, and engineers working with computer science, digital electronics, or coding. No sign-up needed — just type and convert instantly.
Why use this converter? Whether you're debugging memory addresses, writing assembly code,
setting Unix file permissions with chmod, or working with RGB color values in CSS — this tool
gives you instant, accurate conversions across all four major numeral systems with a visual bit-by-bit
breakdown to help you understand the binary representation at a glance.
Base 2 (Binary), Base 8 (Octal), Base 10 (Decimal), and Base 16 (Hexadecimal). This tool converts between all four simultaneously as you type.Decimal field. The binary equivalent appears instantly. For example, decimal 255 converts to binary 11111111. The bit visualization below the inputs shows each individual bit.0 and 1 digits) into the Binary field. The hexadecimal result updates instantly. For example, 11111111 equals hex FF. Invalid characters are filtered out automatically.color codes in web design (e.g. #FF5733), memory addresses, byte values in debugging, and data encoding in HTML, CSS, and low-level systems programming. It represents binary data far more compactly than decimal.0–7. It is found in Unix/Linux file permissions (e.g. chmod 755), certain assembly languages, and embedded systems. Each octal digit represents exactly 3 binary bits — a compact shorthand for binary values.2&sup5;³ − 1 (approximately 9 quadrillion in decimal). This comfortably covers all 32-bit and 64-bit programming use cases.
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