Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36, plus bitwise views.
Any base to any base
Type in any field — the rest follow.
Prefixes are accepted and stripped automatically — 0x1f, 0b1011 and 0o17 all work. Underscores and spaces are ignored, so grouped values paste cleanly.
Bit inspector
Binary laid out in bytes, most significant first.
- Bits needed
- 8
- Bytes shown
- 1
- Fits in
- 8-bit
About the number base converter
Type a value into any base field and the others update instantly — binary, octal, decimal and hex side by side, with a custom field for any radix from 2 to 36. Large values are handled with BigInt so nothing silently loses precision. A bit inspector shows the binary laid out in bytes with each bit position labelled.
This tool runs entirely in your browser. Nothing you type is uploaded, and it keeps working with no connection at all — including as an installed app.