Universal Number System Converter
Category: Coding & Dev Tools
Last Updated On: July 14, 2026
Convert between decimal, hexadecimal, binary, octal, and ASCII.
Result will appear here...
Conversion History
About the Tool - Universal Number System Converter
The Universal Number System Converter tool is an advanced developer-grade tool that converts values between Decimal, Hexadecimal, Binary, Octal, and ASCII formats. It supports big integers, negative numbers, two’s complement representation, UTF-8 multi-byte encoding, prefix handling (0x, 0b, 0o), and smart auto-detection of input formats.
Features
- Smart Auto-Detect mode for automatic input format recognition.
- Conversion between Decimal, Hexadecimal, Binary, Octal, and ASCII.
- Full ASCII string to Hex/Binary sequence conversion.
- Handles space-separated binary values.
- Supports negative numbers and signed/unsigned mode.
- Two’s complement representation with selectable bit length (8, 16, 32, 64-bit).
- UTF-8 multi-byte encoding and decoding support.
- Prefix handling (add/remove 0x, 0b, 0o automatically).
- Grouped binary output for improved readability.
- Uppercase/lowercase HEX toggle.
- Swap input/output types instantly.
- Conversion history panel for quick reference.
- One-click modern clipboard copy.
- Works entirely in your browser — no data leaves your device.
How to Use
- Select the Input Type (or choose Auto Detect).
- Enter your number, binary sequence, hexadecimal value, or ASCII text.
- Select your desired Output Type.
- Adjust advanced options such as:
- Signed/Unsigned mode
- Two’s complement
- Bit length selection
- HEX case formatting
- UTF-8 mode
- Click Convert to see formatted input/output results.
- Use Swap to reverse conversion instantly.
- Copy the result or review previous conversions in the history panel.
Frequently Asked Questions
Binary is a base-2 number system that uses only 0 and 1.
Computers use binary because digital circuits have two states: ON and OFF.