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Number base converter

Bases

Paste a value in any base — see all four instantly.

Runs in your browser. Numbers stay on this device — nothing is uploaded to BrowserSpaces for processing.

Four bases

2, 8, 10, 16.

Validation

Rejects invalid digits.

Dev handy

Quick hex/bin checks.

Use the calculator

Binary (2)

11111111

Octal (8)

377

Decimal (10)

255

Hex (16)

FF

How it works

How base conversion works

Parse with the source radix, then emit string forms in each target radix.

Three steps

  1. 1

    Pick source base

    What you’re pasting.

  2. 2

    Enter value

    Valid digits only.

  3. 3

    Read all bases

    Side-by-side.