Calculate Binary Addition Online
Calculate Binary Addition numbers with carry visualization and multi-format output. Free, offline, client-side, instant and secure.
Add two or more binary numbers and see the result in binary, decimal, and hexadecimal. Supports arbitrary precision with BigInt.
How to Use Calculate Binary Addition Online
- Enter Your Binary Numbers: Type or paste binary numbers into the input box, one per line. You can also use comma-separated values. Each number should contain only 0s and 1s.
- Click "Add Binary Numbers": The calculator adds all inputs together using arbitrary-precision arithmetic (BigInt), so there is no bit-width limit.
- Review the Result: The output shows each input number right-aligned, the addition line, and the sum - similar to how you would add on paper.
- Check Multiple Formats: Below the binary sum you will see the result in decimal and hexadecimal, useful for cross-checking your work.
- View Statistics: The stats section shows how many numbers were added, the widest input, the result bit width, and whether a carry overflow occurred.
- Copy or Download: Click "Copy to Clipboard" to paste the result elsewhere, or "Download TXT" to save it as a file for documentation or homework.
Frequently Asked Questions
How does binary addition work?
Binary addition follows the same column-by-column rules as decimal addition, but with only two digits. 0+0=0, 0+1=1, 1+0=1, and 1+1=10 (0 with a carry of 1). This calculator handles carries automatically across any number of bits.
Is my data secure?
Yes. All processing happens entirely in your browser using client-side JavaScript. Your binary numbers are never uploaded to any server, so your data stays private on your device.
Do you store my data?
No. This tool runs 100% client-side. Nothing you enter is saved, logged, or transmitted anywhere. Close the tab and everything is gone.
Is this tool free?
Completely free, no sign-up needed, no usage limits. Use it as many times as you want for homework, projects, or work.
How many binary numbers can I add at once?
There is no hard limit. You can add two numbers or hundreds. The tool uses JavaScript BigInt for arbitrary precision, so even very large binary values are handled correctly.
What happens if I enter an invalid value?
The calculator checks every line for non-binary characters. If a line contains anything other than 0 and 1, you will see a clear error message telling you which line has the problem.
Can I add binary numbers of different lengths?
Yes. Shorter numbers are automatically zero-padded on the left to match the longest input, just like adding numbers of different digit counts in decimal.
Which browsers are supported?
All modern browsers including Chrome, Firefox, Safari, and Edge. The tool requires BigInt support, which is available in all browsers released after 2020.
Can I use this tool offline?
Once the page has loaded, it works without an internet connection. All the code runs locally in your browser.
What does “carry overflow” mean in the stats?
It means the result has more bits than the widest input. For example, adding 1111 (4-bit) + 0001 (4-bit) gives 10000 (5-bit). The extra bit is a carry overflow, which matters in fixed-width hardware but not here since precision is unlimited.