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Base Converter

Convert numbers between binary, octal, decimal and hexadecimal. BigInt-safe for large values.

2 / 8 / 10 / 16 BigInt-safe Instant
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All bases

How it works

Three simple steps —everything happens in your browser.

1

Enter a number

Type the number you want to convert, and select its base.

2

Pick the target base

Choose the base you want to convert to. The result updates instantly.

3

Copy the result

Click the result to copy it. Values are computed with BigInt, so large numbers stay exact.

Why use Ercc Base Converter?

BigInt precision

Uses BigInt internally, so numbers beyond the safe integer range convert without losing digits.

Four common bases

Supports binary, octal, decimal and hexadecimal —everything programmers and students need.

100% local

All conversion happens in your browser. Nothing is sent anywhere.

What is a numeral base?

A numeral base (or radix) is how many unique digits a number system uses. Binary (base-2) uses 0 and 1, octal (base-8) uses 0-7, decimal (base-10) uses 0-9, and hexadecimal (base-16) uses 0-9 plus A-F.

Computers natively work in binary, while programmers often use hexadecimal and octal for readability. Being able to convert between bases is essential for debugging, subnetting, color codes, and low-level programming.

How to convert between bases for free

Converting bases with Ercc is instant:

  1. 1. Enter the number and choose its current base.
  2. 2. Pick the target base.
  3. 3. Read the result, or view all four bases at once.

No limit and no watermark. Conversion runs entirely in your browser.

FAQ

Frequently Asked Questions

Why does binary only use 0 and 1?

Because binary is base-2: it has only two digits, 0 and 1. Each position represents a power of 2. Computers use binary because transistors have two states (on and off).

When should I use hexadecimal?

Hexadecimal (base-16) is compact and maps neatly to binary: each hex digit equals exactly 4 bits. It is widely used for color codes, memory addresses, and machine code.

Can the converter handle very large numbers?

Yes. The tool uses BigInt internally, so it can convert numbers far larger than the safe integer limit (2^53) without losing precision.

What is 255 in binary?

255 in decimal equals 11111111 in binary (eight 1s), 377 in octal, and FF in hexadecimal. It is the maximum value of an 8-bit byte.

Is the base converter really free?

Yes, 100% free with no limits and no watermark. Everything runs locally in your browser.