Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal.
The Number Base Converter is a fast, accurate Developer utility designed to convert numbers between binary, octal, decimal, and hexadecimal. entirely in your browser with zero server data storage.
Binary: 0, 1
Octal: 0–7
Decimal: 0–9
Hexadecimal: 0–9, A–F
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Systems & Security Engineers • Applied Cryptography & High-Performance Web Tools
How to Use Number Base Converter
Enter Number
Type a number in any base (binary, octal, decimal, or hex).
View Conversions
See the number converted to all other bases instantly.
Copy Result
Click on any result to copy it to your clipboard.
Practical Examples & Conversions
42
101010 (binary)
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Authoritative Standards & Citations
Calculations and algorithms on this page are implemented and verified in strict accordance with the following official technical specifications:
RFC 7519: JSON Web Token (JWT)
Standardized compact, URL-safe means of representing claims to be transferred between two parties.
Web Cryptography API Specification
Standard JavaScript API for performing basic cryptographic operations in web applications.
RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace
Definition of uniform format and generation algorithms for UUIDs.