What is Base Converter?
This base converter translates numbers between binary (2), octal (8), decimal (10), and hexadecimal (16) in real time. Type a number, pick its source base from the dropdown, and all four representations appear instantly — hex is shown in uppercase. Invalid input simply clears the results instead of throwing errors, and no button press is needed. All math runs locally in your browser. Useful for programming practice, IP and subnet math, bitwise debugging, and everyday base conversion.
▶Use Cases5 scenarios
- ◆Understanding base relationships while learning to code
- ◆Converting decimal and hex color values
- ◆IP address and subnet mask math
- ◆Bitwise operation debugging
- ◆Quick answers for interviews and exams
▶How to Use5 steps
- 1Type a number (e.g., FF, 1010, 255)
- 2Select its source base from the dropdown
- 3All four base results update instantly
- 4Hex output is shown in uppercase
- 5Copy the representation you need
▶Features8 features
- ✓Free
- ✓No signup
- ✓Supports binary, octal, decimal, hex
- ✓Real-time conversion, no clicks needed
- ✓All four bases shown at once
- ✓Uppercase hex output
- ✓100% local calculation
- ✓Graceful handling of invalid input
▶FAQ7 questions
What is a base converter?
An online tool that converts numbers between bases. Input: a number and its current base (2/8/10/16). Output: the same number in binary, octal, decimal, and hexadecimal. Used for programming practice, color math, and bitwise debugging. All calculation is local.
Which bases are supported?
Binary (2), octal (8), decimal (10), and hexadecimal (16). Pick the source base from the dropdown.
What happens with invalid input?
Nothing breaks — results simply clear when parseInt cannot parse the value. Enter a valid number and results return.
Why is hex output uppercase?
For readability, hexadecimal output uses uppercase letters (A-F).
Does it support decimals?
The current version parses integers; fractional parts are ignored. It targets integer base conversion.
Does it update in real time?
Yes — results recompute instantly as you type or change the base, with no button required.
Can I convert in reverse?
Yes. Select the base of the number you have, and the other three representations are computed automatically.