Number Base Converter
Convert a whole number between binary, octal, decimal and hexadecimal. Enter a value and its base and see all four at once. Runs in your browser.
- Runs entirely in your browser
- No sign-up, no watermark
- Free and unlimited
🔒 Your file stays on your device
How to use Number Base Converter
- 1
Open Number Base Converter and fill in the fields.
- 2
Pick any options that apply.
- 3
Read the result straight away — it recalculates as you type.
What you get
- Binary, octal, decimal, hexadecimal
- All four shown together
- Validates the input digits
What happens to your files
This tool runs entirely in your browser. The file you choose is read into memory, processed on your device, and offered back as a download. Nothing is uploaded and nothing is kept once you leave the page.
There is no account, no email, no watermark and no daily limit. Come back whenever you need it.
Frequently asked questions
- Is there a size limit?
- Values are converted with JavaScript's safe integer range, so up to 2^53 − 1 (about 9 quadrillion). Larger numbers are rejected rather than shown inaccurately.