# Number base converter — bin/oct/dec/hex, no upload

> Convert numbers between binary, octal, decimal, and hexadecimal in your browser, including arbitrary bases. Nothing is uploaded.

Convert numbers between binary, octal, decimal, hexadecimal, and other bases. The math is done in the browser, so nothing is transmitted.

Working with flags, colors, or low-level data means constantly translating between decimal, hex, and binary. Seeing all representations at once removes the mental arithmetic and the off-by-one mistakes.

For byte-level views of text use the hex/ASCII converter; for colors specifically, the color converter handles hex and RGB.

## How to

1. **Enter a number.** Type a value and its current base.
2. **Pick target bases.** See it in binary, octal, decimal, and hex at once.
3. **Copy.** Copy the representation you need.

## FAQ

### Can it convert hex to binary directly?

Yes. Enter a hex value and its binary, octal, and decimal equivalents are shown together, so you don't need to go via decimal by hand.

### Does it handle large numbers?

It works with big integer values in the browser, so wide bit patterns convert without overflow surprises.

### Is anything uploaded?

No. Base conversion is arithmetic performed locally in the tab.


## Related tools

- [Hex / ASCII / binary](https://www.safepaper.app/dev/hex-ascii)
- [Color converter](https://www.safepaper.app/dev/color-convert)
- [Timestamp](https://www.safepaper.app/dev/unix-timestamp-converter)
- [ASCII table](https://www.safepaper.app/dev/ascii-table)

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Canonical HTML: https://www.safepaper.app/dev/number-base
Markdown: https://www.safepaper.app/dev/number-base.md

There is no upload endpoint — your files are processed in this browser tab. Open your network tab and check.