Binary to Decimal
Convert binary to decimal online. Validates that the input is only 0s and 1s and handles very long binary strings exactly with BigInt. Free and private.
Decimal value
166
What is the Binary to Decimal?
The ByteTools Binary to Decimal converter turns a string of 0s and 1s into its base-10 value. Spaces and line breaks between groups are ignored, so you can paste nibble- or byte-grouped binary straight from documentation without reformatting it first.
- Converts any-length binary to exact decimal with BigInt
- Validates input is only 0s and 1s
- Ignores spaces and line breaks between groups
- No rounding on long binary strings
- Clear error for invalid characters
- 100% client-side — runs entirely in your browser
How to use the Binary to Decimal
- 1
Type or paste your binary string (0s and 1s) into the input box.
- 2
Spaces and line breaks between groups are ignored automatically.
- 3
Read the decimal result as it updates instantly.
- 4
Copy the decimal value with one click.
About the Binary to Decimal
The ByteTools Binary to Decimal converter turns a string of 0s and 1s into its base-10 value. Spaces and line breaks between groups are ignored, so you can paste nibble- or byte-grouped binary straight from documentation without reformatting it first.
It validates the input and rejects anything that is not a 0 or a 1, so you never get a silently wrong answer. Conversion uses JavaScript's BigInt, meaning even 64-bit and longer binary strings convert exactly, with no floating-point rounding.
Everything runs 100% locally in your browser. Nothing you enter is uploaded, logged or stored, so the tool is private, instant and works offline.
Frequently asked questions
How do I convert binary to decimal?
Enter the binary digits and the decimal value appears instantly. Each bit represents a power of two; the tool sums the values of every 1 bit — using BigInt — so even long binary strings convert exactly.
What is 1010 in decimal?
Binary 1010 equals 10 in decimal. Reading right to left the bits are worth 0, 2, 0 and 8, and 8 + 2 = 10. Paste any binary string into the tool to see its decimal value immediately.
Can I include spaces in my binary input?
Yes. Spaces and line breaks are ignored, so grouped binary like 1010 0110 converts the same as 10100110. This lets you paste byte- or nibble-grouped values without cleaning them up first.
What happens if I enter a digit other than 0 or 1?
The tool validates the input and shows an error if it finds any character other than 0 or 1. That prevents you from getting a misleading result from a typo or from pasting the wrong kind of number.
Is my input uploaded to a server?
No. The conversion runs entirely in your browser with JavaScript, so nothing you type is transmitted, logged or stored. The tool works offline once the page has loaded.
Guides for Binary to Decimal
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