Add Binary Bits
Find the sum of set bits in binary numbers. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Add Binary Bits
- 1. Paste your binary values. Type or paste one or more binary numbers into the input pane, separated by spaces or newlines. Something like 1010 1100 works fine; the tool treats everything as a stream of bits.
- 2. Read the total. The tool performs a popcount across all the input, adding up every 1 bit it finds. For 1010 1100 that is two set bits in each value, so the sum is 4.
- 3. Copy the result. Hit the copy button on the output pane and take the count wherever you need it, whether that is a debugging note, a code comment or a homework answer.
When to use Add Binary Bits
Add Binary Bits is a quick popcount calculator, also known as Hamming weight. Whenever you need to know how many bits are set across one value or a whole batch of them, paste the bits here instead of writing a throwaway loop or reaching for a language builtin.
- Verifying a permission bitmask. You are debugging a flags field where each set bit grants a capability. Paste the mask in binary and the count tells you instantly how many permissions are actually enabled.
- Checking Hamming weight in crypto homework. Exercises on error correcting codes and cryptographic sboxes often ask for the weight of a codeword. Paste the codeword and get the exact number without counting ones by eye.
- Sanity-checking a popcount implementation. You wrote a Kernighan-style bit counting loop and want ground truth. Feed the same test vectors into this tool and compare its answers against what your function returns.
- Estimating density of a bit array. A Bloom filter or bitmap index dump looks suspiciously full. Paste a sample of the bits and the set-bit total gives you a rough occupancy figure in seconds.
Examples
Popcount
Input
1010 1100
Output
4
About the Add Binary Bits tool
Add Binary Bits is a free online tool that works entirely inside your web browser. Find the sum of set bits in binary numbers. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 112 Binary utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
There is nothing to configure. Provide the input and the result appears on its own. A worked example further down the page shows exactly what the tool produces for a real input.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is Add Binary Bits free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.