Number base converter
Type a number in any base — binary, octal, decimal or hexadecimal — and the others update live. Big values are handled exactly. Nothing is uploaded.
Number bases
Binary
2
Octal
8
Decimal
10
Hexadecimal
16
Text ⇄ Binary & Hex
Text
Binary (bytes)
Hex (bytes)
Everything runs in your browser. No upload, no sign-up.
How it works
STEP 1
Type a number
Enter it in binary, octal, decimal or hexadecimal — whichever you have.
STEP 2
See every base
The other three update live, even for very large numbers (BigInt, no precision loss).
STEP 3
Text ⇄ binary / hex
Encode any text to its binary or hex bytes and back. Copy with one click — all private.