Universal Number System Converter
Category: Coding & Dev Tools
Last updated on: March 4, 2026
Convert between decimal, hexadecimal, binary, octal, and ASCII.
Result will appear here...
Conversion History
About the Universal Number System Converter
The Universal Number System Converter 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.