Hex ⇄ Decimal ⇄ Binary Converter

Convert quickly between hexadecimal, decimal and binary. Supports very large integers via BigInt. Negative values accepted.

Prefix 0x optional. Letters A–F allowed.
Plain decimal integer. Negative allowed.
Prefix 0b optional. Digits 0/1 only.
Enter a number in any field — conversion runs automatically.
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Uppercase, without prefix, negative shows leading -.
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Plain integer (may be large).
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No prefix, negative shows leading -.
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Keyboard: type in any field — Enter to Convert, Esc to Clear.
Note: This tool only handles integer conversions. Fractions / floats are not supported.