Number Base Converter
Convert between binary, octal, decimal and hex.
✓ Professional standard Uses precise SI and internationally agreed conversion factors for accurate, standards-based results.
Number Base Converter is a free online converter from Toolinza. Convert between binary, octal, decimal and hex. It runs entirely in your browser — your data is never uploaded — needs no signup, and works on any device. Toolinza offers 293+ free tools used by people across the UK, USA, Canada, Australia, the EU, India, Pakistan, the Middle East and worldwide.
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About the Number Base Converter
Programmers and students constantly move between number bases — binary for bits, hexadecimal for colours and memory, octal in some systems, and everyday decimal. Converting by hand is slow and error-prone, especially for long values.
This Number Base Converter switches between binary, octal, decimal and hexadecimal instantly, so you can read and write values in whatever base you need.
How to use the Number Base Converter
- Enter your number.
- Choose the base you are converting from.
- Choose the base you are converting to.
- Read the converted value instantly.
Key features of the Number Base Converter
- Converts binary, octal, decimal and hex
- Instant, accurate conversion
- Handles long values
- Essential for programming and study
- Private — runs in your browser
How the Number Base Converter works
Every conversion uses the exact, internationally agreed factors defined by the International System of Units (SI) and recognised standards bodies. Temperature conversions apply the correct formulas rather than simple multipliers, and results retain full precision so they are suitable for scientific, engineering and everyday use alike.
All conversions are calculated instantly in your browser.
Tips & best practices
- Hexadecimal is compact for binary data — each hex digit represents exactly four bits.
- Prefixes help you keep track: 0b for binary, 0o for octal and 0x for hex are common conventions.
- Double-check you selected the correct source base, as the same digits mean different values in different bases.
Standards & accuracy
Uses precise SI and internationally agreed conversion factors for accurate, standards-based results.
Results are accurate to standard conversion factors. For everyday use you can round sensibly; for scientific, medical or engineering work, keep the full precision the tool provides.
Who uses the Number Base Converter?
- Programming and debugging
- Working with hex colour codes
- Computer science study
- Reading memory addresses and bitmasks
Privacy & security
The Number Base Converter runs entirely inside your web browser. Your data — whether that is a file, figures or text — is processed on your own device and is never uploaded to a server, stored or shared. There is no signup and no account, so you can use it as often as you like while keeping full control of your information. This makes it a safe choice even for confidential and sensitive work.
Why choose Toolinza?
- 100% free — no hidden charges, watermarks or usage caps.
- Private & secure — your data stays on your device.
- Standards-compliant — accurate results suitable for the UK, USA, Canada, Australia, EU, India, Pakistan, the Middle East and worldwide.
- Works everywhere — desktop, tablet and mobile.
Frequently asked questions
Enter the decimal number, set the source to decimal and the target to binary, and the converter shows the binary form instantly.
Hex is widely used in programming for colours, memory addresses and binary data, because each digit maps neatly to four bits.
Yes. It converts between binary, octal, decimal and hexadecimal in any direction.
Yes. The Number Base Converter is completely free with no signup, no watermarks and no usage limits. Toolinza is supported by unobtrusive advertising so every tool stays free.
Absolutely. This tool runs entirely in your browser — your data and files are never uploaded to any server, so everything stays private on your own device.
No. The Number Base Converter works instantly in any modern web browser on desktop, tablet and mobile — Windows, macOS, Linux, Android and iOS.