Four results at once
Binary, octal, decimal and hexadecimal are shown together.
🔟
Number Base Converter
Convert numbers between binary, octal, decimal, hex and more.
🔒 Enterprise privacy — 100% client-side, no server uploads
Handles very large whole numbers exactly. Decimals (fractions) are not supported.
What is Number Base Converter?
Number Base Converter is a free online tool that lets you convert numbers between binary, octal, decimal, hex and more. It works in your web browser with no signup. Enter your text or numbers and see the result instantly. Everything you type stays in your browser.
Also searched as: binary to decimal, decimal to hex, hex to binary, base converter.
Number Base Converter at a glance
- Price
- Free, with no paid plans
- Account
- No signup or login needed
- Where it runs
- In your web browser
- Your data
- Nothing you type is sent to a server
- Works on
- Any modern browser, on desktop and mobile
- Category
- Developer & Everyday Calculators
When to use Number Base Converter
- →Convert binary to decimal for homework
- →Read hex values in programming
- →Check numbers in different bases quickly
How to use Number Base Converter
- 1
Open Number Base Converter and fill in the values it asks for.
- 2
The result appears and updates instantly as you change any field.
- 3
Copy the result if you need to paste it elsewhere.
Why use Number Base Converter
- ✓Runs entirely in your browser — your file is never uploaded to a server.
- ✓No account, signup, or email address required to use it.
- ✓Completely free, with no daily limit and no signup.
- ✓Gives an instant, accurate result without opening a spreadsheet.
Number Base Converter
Convert between binary, octal, decimal and hex
Enter a number in any base and see it in binary, octal, decimal and hexadecimal at the same time.
Choose the input base
Pick the base your number is written in, including binary, octal, decimal and hexadecimal shortcuts.
Instant
The results update as you type.
Handles large numbers
Large values are converted exactly rather than rounded.
Private
Everything is calculated in your browser.
Free, no signup
No account and no limit.
Everything you need in Number Base Converter
- Binary (base 2)
- Octal (base 8)
- Decimal (base 10)
- Hexadecimal (base 16)
- Choose your input base
- Instant results
- Runs in your browser
- Free and no signup
Tips for better results
- 1
Set the input base first
The same digits mean different numbers in different bases, so choose the base before you type.
- 2
Use hex for colours and memory
Hexadecimal is common in colour codes and low-level programming because it is compact.
- 3
Check negative numbers
A minus sign in front of the number is handled, but how a computer stores negatives can differ.
0files uploaded
0signups needed
0cost to use
Tutorials on Number Base Converter
Short, practical guides that go with this tool.
🔒 Your privacy with Number Base Converter
Number Base Converter runs as client-side JavaScript inside your own browser tab. Your file or text is read, processed, and turned into a result on your device — it is never sent to, stored on, or seen by Toolkitties' servers. Closing or refreshing the page clears everything.
Frequently asked questions
Which bases are shown?
Binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16).
How do I convert binary to decimal?
Set the input base to binary, type your binary number and read the decimal result.
How do I convert hex to binary?
Set the input base to hexadecimal, type the hex value and read the binary result.
Why does the tool say my number is invalid?
The digits may not exist in the base you picked, for example a 2 in a binary number.
Can it handle very large numbers?
Yes. Large values are converted exactly.
Is anything uploaded?
No. Everything is calculated in your browser.
Is Number Base Converter free to use?
Yes. Number Base Converter is 100% free, with no signup, no daily limit and no paid plans.
Do I need to create an account to use Number Base Converter?
No signup or login is required. Open the page and start using Number Base Converter immediately.
Is it safe to use Number Base Converter with private or sensitive files?
Yes. Number Base Converter processes your file locally in your browser using client-side code. The file itself is never uploaded to Toolkitties' servers.