Base Converter (Bin / Dec / Hex / Oct)
Free base converter tool. Instantly convert binary, decimal, hex, or octal numbers into all four bases at once — no manual calculation needed.
What Base Converter (Bin / Dec / Hex / Oct) Does
Takes a number string in one selected base (binary, decimal, hex, or octal) as input and outputs its equivalent representation in all four bases simultaneously — binary, decimal, uppercase hexadecimal, and octal — displayed as labeled results in a single output block.
Who Uses This Tool
Base Converter (Bin / Dec / Hex / Oct) is built for Computer science students, embedded systems engineers, low-level firmware developers, network engineers working with subnet masks, CTF competitors, digital electronics hobbyists, assembly language programmers. Whether you are processing data as part of an automated pipeline or need a quick one-off conversion in your browser, the tool requires no installation and no account — paste your input and get your result in seconds.
Primary Use Case
Converting a binary or hexadecimal value into its decimal and octal equivalents in one step while debugging low-level or bitwise logic.
The Problem It Solves
Manually converting between number bases requires repeated division or multiplication chains that are slow and produce transcription errors at every step. Working across multiple bases simultaneously normally means running separate conversions and cross-checking results by hand. This tool eliminates the multi-step manual process and outputs all four base representations from a single input, removing the risk of arithmetic mistakes mid-chain.
Example
11111111
Binary: 11111111 Decimal: 255 Hex: FF Octal: 377
When to Use This Tool
Use this tool when working with binary data, debugging low-level systems, converting memory values, analyzing machine representations, or learning computer science concepts.
What to Do With the Output
Copy the decimal value into arithmetic expressions or configuration files, paste the hex output into memory address fields or color pickers, use the binary result to verify bitmask logic, or insert the octal value into Unix file permission assignments.
Common Mistakes to Avoid
Selecting the wrong input base before entering a number produces a silent wrong result — the tool validates digits against the selected base but cannot detect that the base itself was chosen incorrectly. Entering hex values with a leading 0x prefix will fail validation since the tool expects raw digits only. Spaces and separators like underscores are stripped silently, so a grouped binary like 1111 0000 converts correctly, but visually grouped hex like FF EE will also be collapsed before conversion. Lowercase hex input is accepted; output hex is always uppercase.
How It Works
The input string is sanitized by stripping whitespace, then validated against a regex pattern matching only legal digits for the selected base. The validated string is parsed into a JavaScript BigInt using base-prefixed literals (0b for binary, 0o for octal, 0x for hex, or direct BigInt() for decimal). BigInt is used instead of standard number parsing to handle arbitrarily large integers without floating-point precision loss. The BigInt value is then serialized to strings in bases 2, 10, 16, and 8 using the native toString(base) method, with hex output forced to uppercase.
Pro Tip
For large bitmasks or cryptographic values that exceed 32-bit integer limits, this tool handles them safely via BigInt — paste a 64-bit binary string or a full SHA-derived hex value and the decimal and octal outputs will remain precise where standard parseInt would silently truncate or lose accuracy.
Also Known As
Base Converter (Bin / Dec / Hex / Oct) is also commonly referred to as number base converter, radix converter, binary hex converter, bin to dec, dec to hex, hex to dec, oct to bin, base 2 to base 10, base 16 converter, numeral system converter, positional notation converter. All of these terms describe the same conversion — no matter what you call it, this tool handles it.