The Add Integer Digits tool takes a list of integers and calculates the sum of digits in each one. Drop in a few numbers like 123 or 45, and you’ll instantly see results like 6 and 9. It’s perfect for quick digit math, checksum-style tasks, or exploring numeric patterns.
The tool handles negatives just fine. Extra spaces? Not a problem. You control how it behaves skip invalid lines, hide zero results, or expand the output to fit larger lists. Everything runs live and locally, so nothing ever leaves your browser.
It also supports file import and export, which makes it easy to load or share batches of numbers.
How to Use:
- Paste or import integers, one per line
- Toggle Ignore non-integers to skip text or bad lines
- Enable Skip 0-digit results to hide lines that sum to 0
- Use Maximize output to expand the output box
- Click Convert to see the digit sums
- Use Copy Output or Export to File to save the results
- Hit Clear All to reset everything
What Add Integer Digits can do:
This tool helps you break numbers down fast. Whether you’re teaching math, cleaning input data, or looking for patterns, it delivers instant digit sums. You can trim noise by ignoring junk input, hide any zeros that show up, and resize the output with a single switch. It’s all done right on the page quick, easy, and safe to use.
Example:
Before:
123
45
007After:
6
9
7Common Use Cases:
Use it for teaching digit addition, prepping quiz sheets, cleaning data sets, or performing checksum-like operations. It’s a quick way to find number patterns or validate human-entered data.
Useful Tools & Suggestions:
After using Add Integer Digits, try Multiply Integer Digits to see how the same digits behave under a different operation. And if you want to visualize what you’re working with, Separate Integer Digits breaks each number down before doing any math.