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Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal online with BigInt precision, plus text ↔ hex ASCII conversion. Instant, client-side.

Number converter

Binary

11111111

Octal

377

Decimal

255

Hexadecimal

FF

Text → HEX

486921

HEX → Text

Hi!

How to use

  1. Paste input or drop a file above.
  2. Adjust options (delimiter, dialect, quality, ratio).
  3. Copy result or download — no sign-up needed.

FAQ

How large numbers work?

BigInt is used, so even 128-bit values convert exactly — no float rounding.

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