Tools › Binary, Decimal & Hex Converter
Binary, Decimal & Hex Converter
Free online number base converter. Turn binary into decimal, decimal into hex or octal, or any base from 2 to 36. Handles huge numbers and 0x/0b prefixes.
Use it from code
The same function is available as an API endpoint. Free tier: 200 calls per day without a key. Pro lifts the limit.
curl -X POST https://spincrus.uz/api/v1/tools/number-base-converter \
-H "content-type: application/json" \
-H "x-api-key: YOUR_KEY" \
-d '{"value":"11111111","fromBase":2}'FAQ
How do I convert binary to decimal?
Set the input base to 2 and type the binary digits. Each digit is multiplied by a power of two, counting from the right, and the products are added: 1101 is 8 + 4 + 0 + 1 = 13.
Can I paste numbers with 0x or 0b prefixes?
Yes. A leading 0x, 0b or 0o sets the input base automatically (hex, binary, octal). Spaces, commas and underscores inside the number are ignored, so 1111_0000 works.
Is there a size limit on the number?
No practical one. The conversion uses arbitrary-precision integers, so values beyond 2^53 stay exact. Only whole numbers are supported; fractions and floating point are rejected.
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