Binary to Decimal Converter — Online Free Tool

Convert binary (base-2) numbers to decimal (base-10). Validates binary input format and handles both 8-bit and multi-byte binary strings accurately.

Key Features

Converts binary sequences (0s and 1s) to base-10 decimal numbers
Ignores spaces, commas, and formatting separators in input automatically
Validates binary format and flags non-binary characters immediately
High-precision calculation supporting arbitrarily long binary strings

How to Use

Paste or type your binary string (e.g. 10110100) into the input box.
Verify that the input contains only 0s, 1s, or spacing separators.
Click "Convert to Decimal" to calculate the decimal equivalent.
Review the calculated integer in the output field.
Copy the decimal number for your calculations.

Example

Sample input

Sample output

Edge Cases

Leading zeros ignored
Invalid characters (2, letters)
Empty string

Frequently Asked Questions

Can I paste binary numbers with spaces between bytes?

Yes. Any spacing, grouping, or underscores between digits are automatically sanitized so you can paste grouped bytes directly.

How does the converter calculate the decimal value?

Each binary digit is multiplied by 2 raised to its positional power from right to left (2^0, 2^1, 2^2, etc.), and the sum yields the decimal integer.

What happens if I enter characters other than 0 or 1?

The validator alerts you immediately and highlights the invalid character positions so you can correct your input.

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Privacy notice: when you run this tool, your input is sent over HTTPS to our server, processed in memory and returned. It is not stored or logged. Avoid pasting live secrets such as private keys or passwords.