Decimal to Binary Converter
Decimal to Binary Converter: free, instant and private. Computers store one number; bases are just ways of writing it.
How the Decimal to Binary Converter works
The Decimal to Binary Converter takes Number, From base, To base and returns the answer instantly — no button to hunt for, no page reload. Computers store one number; bases are just ways of writing it. Hex exists because 16 is a power of two — one hex digit is exactly four bits, which is why memory addresses and colour codes both use it.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
parseInt(value, fromBase) → toString(toBase)
| Symbol | Meaning |
|---|---|
| binary | base 2 — 0s and 1s only |
| octal / hex | base 8 and 16 — hex uses A–F for 10–15 |
Computers store one number; bases are just ways of writing it. Hex exists because 16 is a power of two — one hex digit is exactly four bits, which is why memory addresses and colour codes both use it.
Inputs used: Number, From base, To base.
Worked example
Take the default example — number of 255, from base set to Decimal (10), to base set to Binary (2):
- Converted value: 11111111
- Decimal: 255
- Binary: 11111111
- Octal: 377
- Hex: FF
- fromBase: decimal
- toBase: binary
Frequently asked questions
- What formula does the Decimal to Binary Converter use?
- It uses parseInt(value, fromBase) → toString(toBase), where binary is the base 2 — 0s and 1s only; octal / hex is the base 8 and 16 — hex uses A–F for 10–15.
- Is the Decimal to Binary Converter free?
- Yes. There is no signup, no usage limit and no watermark — the calculator runs entirely in your browser.
- How do I read the result?
- Computers store one number; bases are just ways of writing it. Hex exists because 16 is a power of two — one hex digit is exactly four bits, which is why memory addresses and colour codes both use it.
- Does the Decimal to Binary Converter store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.