Number Base Converter
Convert between binary, octal, decimal, hex, base32 and base64.
Convert between binary, octal, decimal, hex, base32 and base64.
This free Number Base Converter from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the Number Base Converter
- Pick the unit you have and the unit you want.
- Enter the value.
- Read the converted value - most tools update as you type.
- Use the swap button to reverse the direction if needed.
What you can do with the Number Base Converter
- Convert recipe ingredients between metric and imperial.
- Translate engineering specs across systems.
- Check shipping weights and dimensions before ordering.
- Quick travel conversions for distance, speed and currency.
Why use KX Toolkit's Number Base Converter
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
For very large or very small numbers, use the scientific-notation option - it avoids floating-point rounding errors.
Related Unit Converter Tools
If you find this tool useful, explore the full Unit Converter Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
How do I convert decimal to binary?
Repeatedly divide the decimal number by 2 and write down the remainders in reverse. For example, 13 divided by 2 gives 6 remainder 1, then 3 r1, then 1 r1, then 0 r1, so 13 in binary is 1101. The converter does this instantly for any size of number, including very large values that would be tedious by hand.
What is hexadecimal used for?
Hexadecimal (base 16) uses digits 0-9 and A-F. Each hex digit represents four binary digits, so it is a compact way to write binary values. Hex is used in colour codes (#FF8800), memory addresses, and machine code. The converter translates between binary, octal, decimal, and hex with no manual lookup of digit values needed.
What is the difference between base32 and base64?
Both encode binary data using printable characters, but base32 uses 32 symbols (A-Z, 2-7) and base64 uses 64 symbols (A-Z, a-z, 0-9, +, /). Base64 is more compact, used in email, JSON web tokens, and data URLs. Base32 is case-insensitive and easier to type or speak, used in QR codes, OTP secrets, and DNS records.
Why is base 8 (octal) used?
Octal uses digits 0-7 and groups binary digits in threes. It was popular in early computing because some machines had 12-, 24-, or 36-bit words that divided neatly into octal digits. Today its main use is Unix file permissions (chmod 755). The converter still supports octal because it remains common in system administration.
Can I convert negative numbers and decimals?
Negative integers can be converted by changing sign or representing them in two's complement, depending on the use case. Fractional numbers in non-decimal bases are less common and follow the same digit-by-digit rule with negative powers. The converter typically focuses on non-negative integers, which covers most real-world cases like colour values, IDs, and addresses.
What is base 64 padding?
Base64 encodes 3 bytes into 4 characters. If the input length is not a multiple of 3, the encoder pads with one or two = signs to keep the output length a multiple of 4. So "Ma" encodes to "TWE=" and "M" encodes to "TQ==". When decoding, the converter strips padding automatically before producing the original bytes.
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