Number Base Converter is a 100% free, browser-based utility that enables you to convert between binary, octal, decimal and hex. Unlike traditional cloud converters, all processing executes locally on your device with zero server uploads, delivering immediate results and ironclad data privacy.
About the Number Base Converter
Type a number in any field and all other bases update instantly. The Number Base Converter supports binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16) and a custom base anywhere from 2 to 36.
It uses arbitrary-precision BigInt arithmetic, so even 128-bit values and huge numbers convert exactly without rounding errors. Prefixes such as 0x, 0b and 0o and separators like spaces or underscores are accepted.
How to use the Number Base Converter
- Type a number into the field for its base, for example 255 in Decimal.
- All the other bases update automatically.
- Set a custom base (2–36) if you need something else, then copy any value.
Features
- Binary, octal, decimal & hex
- Custom base 2–36
- Arbitrary-precision BigInt
- Accepts 0x / 0b / 0o prefixes
Why Choose In-Browser Number Base Converter vs Cloud Converters?
| Feature | Toolora (In-Browser) | Traditional Cloud Tools |
|---|---|---|
| Data Privacy | 100% Private (Files stay on device) | Uploaded to remote servers |
| File Size Limits | Unlimited (Limited only by your RAM) | Restricted (e.g. 10MB–50MB caps) |
| Processing Speed | Instant (Zero upload/download delay) | Slow upload & queue waiting |
| Ads & Popups | Clean, distraction-free | Heavy banner & interstitial ads |
Frequently asked questions
How do I convert binary to decimal?
Multiply each bit by 2 raised to its position (counting from 0 on the right) and add them up. For example 1011 = 1×8 + 0×4 + 1×2 + 1×1 = 11. This tool does it instantly for any length.
Can it convert negative numbers?
Yes. A leading minus sign is kept in every base, for example -255 in decimal is -ff in hexadecimal. Two's complement representations are not applied automatically.
What digits are used above base 10?
Letters a–z represent values 10 to 35, so hexadecimal uses 0–9 and a–f, and base 36 uses all digits and letters.