Number Base Converter

Web & Dev Client-Side Privacy

Convert numbers between binary, hex, decimal, and octal.

Binary
Base 2
0b101010
Octal
Base 8
0o52
Hexadecimal
Base 16
0x2A
Binary representation
101010

How to Use Number Base Converter

Follow this simple step-by-step guide to get the most out of our free online Number Base Converter:

  1. 1
    Type the number into the Value field, with an optional 0b, 0o, or 0x prefix.
  2. 2
    Select Binary, Octal, Decimal, or Hexadecimal with the Input base buttons.
  3. 3
    Heed the error if a digit is illegal for the chosen base, since no result is shown until you fix it.
  4. 4
    Read the other three bases in the result rows and copy any one, prefix included.
  5. 5
    Check the Binary representation block at the bottom for the full unpadded bit string.

Key Features & Capabilities

Zero Uploads

Execution occurs 100% locally in your browser memory for maximum privacy.

Instant Latency

Zero network lag or server queues — get results instantaneously as you type.

Quick Export

One-click copy to clipboard or instant file download options built right in.

Technical Specifications & Privacy Guarantee

At utilitiestools.net, privacy and data security are core design principles. When using Number Base Converter, your inputs are parsed and processed locally via client-side JavaScript execution engine. No plain text, uploaded media, or API tokens are transmitted over the internet or logged into remote server infrastructure.

Common Practical Use Cases

  • Embedded firmware: translate a register bitmask from its datasheet hex form into binary to read each flag.
  • Unix permissions: check what octal 755 means as a decimal value while scripting a chmod call.
  • Debugging: convert a decimal error code from a log line into hex to match a vendor's constants table.
  • Networking: turn an IPv4 octet into binary while hand-calculating a subnet boundary.

Frequently Asked Questions

Binary, octal, decimal, and hexadecimal. You pick one input base and all three other representations are shown at once, each with its conventional prefix of 0b, 0o, or 0x.