Number base converter
Type in any base — see all the others update live.
About this tool
Convert numbers between decimal, hexadecimal, binary and octal. Helpful for low-level programming and bit-twiddling.
Features
- DEC ↔ HEX ↔ BIN ↔ OCT
- Live four-way conversion
- Bitwise breakdown
- Local
How to use it
- Type a number in any base.
- Read the others update live.
🔒 100% private
Everything happens inside your browser using JavaScript and WebAssembly. Your files are never uploaded to a server, never stored, and never seen by us.
Frequently asked questions
Is there a size limit?
Up to 64-bit integers; very large values may lose precision in JavaScript.