Is the Number Base Converter free?

Yes — the Number Base Converter is completely free, with no account, subscription, signup, or usage limits.

Is my data uploaded or stored?

No. The Number Base Converter processes everything locally in your browser. Your input is never uploaded, saved, or shared with any server.

Does the Number Base Converter work offline?

Yes. Once the page has finished loading, the Number Base Converter works without an internet connection.

Which browsers does the Number Base Converter work in?

The Number Base Converter works in all modern browsers, including Chrome, Firefox, Safari, and Edge — no plugins or extensions needed.

Can this free number base converter handle large integers?

Yes — the converter handles integers up to JavaScript's safe integer limit (2^53 − 1). For cryptographic or arbitrary-precision work, a dedicated big-integer library is recommended.

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal.

Convert from

Decimal (Base 10) — valid characters: 0–9

Enter Decimal Number

Quick Examples (click to load)

Free browser-based tool · Runs 100% on your device · Last updated July 7, 2026

What is the Number Base Converter?

The free Number Base Converter converts integers between four numeral systems: binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Enter a number in the input field and select its base — the tool instantly displays the equivalent value in all other bases simultaneously. Essential for programming, digital electronics, and computer science coursework.

→ Converting decimal numbers to binary for computer science assignments
→ Converting hexadecimal colour codes to decimal RGB values
→ Understanding memory addresses in octal or hexadecimal for low-level programming
→ Converting between binary and hex for bitwise operation debugging

How to Use the Number Base Converter

1 Enter your number in the input field (e.g. 255).
2 Select the source base: Binary (2), Octal (8), Decimal (10), or Hexadecimal (16).
3 All four equivalent values are displayed instantly.

Key Features

🔢
Binary, Octal, Decimal, Hex

Converts between all four common programming numeral systems in one free tool.
📊
All four bases at once

No need to convert repeatedly — all bases shown simultaneously.
✅
Input validation

Only accepts characters valid for the selected base (0–1 for binary, 0–F for hex, etc.).
⚡
Instant conversion

All bases update in real time on every keystroke.
🆓
Free, no sign-up

100% browser-based — no account or upload required.

Example Usage

Example Input

Input: 255 · Base: Decimal

Example Output

Binary: 11111111 · Octal: 377 · Decimal: 255 · Hex: FF

Frequently Asked Questions about the Number Base Converter

What is the Number Base Converter?: The Number Base Converter is a free online tool that lets you convert numbers between binary, octal, decimal, and hexadecimal. It runs entirely in your browser, so there is nothing to install and nothing is uploaded to a server.
Is the Number Base Converter free?: Yes — the Number Base Converter is completely free, with no account, subscription, signup, or usage limits.
Is my data uploaded or stored?: No. The Number Base Converter processes everything locally in your browser. Your input is never uploaded, saved, or shared with any server.
Does the Number Base Converter work offline?: Yes. Once the page has finished loading, the Number Base Converter works without an internet connection.
Which browsers does the Number Base Converter work in?: The Number Base Converter works in all modern browsers, including Chrome, Firefox, Safari, and Edge — no plugins or extensions needed.
Can this free number base converter handle large integers?: Yes — the converter handles integers up to JavaScript's safe integer limit (2^53 − 1). For cryptographic or arbitrary-precision work, a dedicated big-integer library is recommended.