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Number Base Converter

Conversion

Free online number base converter. Convert between binary, decimal, hexadecimal, and octal instantly. Useful for color values and bitwise operations.

0
0
Number
All bases
Binarybase 211111111
Octalbase 8377
Decimalbase 10255
Hexbase 16FF

How to use the Number Base Converter

Number Base Converter makes data conversion a single-step operation. Navigate to the page, paste your input, and the tool detects the source format and offers compatible target formats. Choose one, and the converted output appears in real time — no file uploads, no account creation, no waiting for server-side processing.

Why use the Number Base Converter

Why use Number Base Converter over a dedicated conversion library? Because you do not always have your development environment available. On a borrowed machine, during a code review, or while pair-programming, opening a browser and pasting data into Number Base Converter is faster than installing dependencies and writing a conversion script.

When to use Number Base Converter

Use Number Base Converter in educational contexts to demonstrate how data serialisation formats relate to each other. Teachers and tutorial authors can show real-time conversion between YAML, JSON, and other formats, helping students understand structural equivalences without needing multiple tools installed.

Key features of Number Base Converter

With Number Base Converter you avoid the typical conversion pain points: file size caps, queue times, and data privacy violations. Your source data stays in your browser, conversions are instant, and the output is formatted for immediate use in your project.

Common use cases for Number Base Converter

Number Base Converter is used when: sharing data with a teammate who uses a different toolchain that expects a different format; converting colour palette files between design tool export formats; and preparing test fixtures in multiple formats to cover different parser implementations in a test suite.

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Related reading

Quick answers for Number Base Converter

Which bases does the Number Base Converter support?
Binary (base 2), Octal (base 8), Decimal (base 10), and Hexadecimal (base 16). Pick the source base, type a number, and all four representations update at once.
Does it handle very large numbers?
Yes. The conversion uses BigInt under the hood, so it stays exact for numbers far beyond JavaScript's 2^53 safe-integer limit. Useful for hashes, 64-bit IDs, and bitmasks.
Can I convert negative numbers?
Yes. Prefix the input with `-` and every output is shown with the negative sign. The tool does not produce two's-complement representations - for that, you'd apply the bitwise inverse of the magnitude in the chosen width.
Why is my hex value rejected?
Hex digits are 0–9 and A–F (case insensitive). Anything else - punctuation, the `0x` prefix, or a stray space - causes the input to be rejected. Strip the `0x` and any separators and try again.
Is the conversion done in my browser?
Yes. Conversion is pure-JS arithmetic on BigInt and runs locally - nothing about the numbers you enter is logged or sent anywhere.