Number Base Converter — Binary Hex Decimal Free

Convert any number between decimal, binary, octal, and hexadecimal. Enter in any base, see all four simultaneously. Free.

How to Use Number Base Converter

Enter InputType or paste your input data into the tool interface

ProcessClick the action button to run the tool

Use OutputCopy or download the result for your project

Number Base Converter — Free Developer Utility

Number Base Converter — convert numbers between decimal, binary, octal, and hexadecimal systems instantly. All four base representations are shown simultaneously so you can see the relationships between them. Computer science and programming require constant number base conversions: binary represents the actual bit values stored in memory, hexadecimal is used in color codes, memory addresses, and debugging, octal appears in Unix file permissions, and decimal is what humans naturally read. Our converter accepts input in any of the four bases and shows all four outputs at once, eliminating the need to run multiple conversions when you need several representations of the same value.

Keywords and Search Terms

Developers searching for this tool use terms like: number base converter, binary to decimal, decimal to hex, binary hex converter, number system converter. Tooliby provides this utility free with no signup, no watermarks, and no data logging.

Privacy — Your Data is Never Stored

Every input you paste into Tooliby developer tools is processed in memory and immediately discarded. We do not log inputs, store results, or analyze your data. Your code, tokens, API keys, and sensitive strings stay completely private.

Frequently Asked Questions

Binary is base 2 — only digits 0 and 1. Each position represents a power of 2. Binary 1010 equals 1×8 + 0×4 + 1×2 + 0×1 = decimal 10.

Hexadecimal is base 16 using digits 0-9 and letters A-F. It is compact — one hex digit represents exactly 4 bits (one nibble), two hex digits represent one byte. Used in color codes (#FF5733), memory addresses, and binary data representation.

Enter your decimal number, select decimal as the input base, and read the hex result. For example, decimal 255 = hex FF = binary 11111111 = octal 377.

Unix permissions like 755 or 644 are octal numbers. 755 means owner: rwx (7), group: r-x (5), others: r-x (5). Our converter shows the binary bits for each permission group.

The converter handles 64-bit signed integers — numbers up to 9,223,372,036,854,775,807. This covers all practical programming use cases including memory addresses on 64-bit systems.