Join Integers
Merge partial integers into one larger integer by concatenation. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Join Integers
- 1. Paste your integer fragments. Enter the partial integers you want merged, in the order they should be concatenated, one per line or separated by your chosen delimiter.
- 2. Set the input separator. Enter Input separator (blank = any whitespace) to tell the tool how your fragments are divided, or leave it blank if they are already split by spaces or line breaks.
- 3. Copy the joined integer. Copy the single larger integer formed by concatenating every fragment in order, ready to paste wherever the combined number is needed.
When to use Join Integers
Join Integers concatenates a list of smaller integer fragments into one larger integer, gluing digits together rather than adding the values. Use it whenever separate number pieces need to become a single combined value, like reassembling a split ID.
- Reassembling a split account number. A legacy system stored an account number across several separate numeric fields, and you need to concatenate them back into the single ID a new system expects.
- Building a composite code from parts. You have a region code, product code and serial fragment as separate integers and need them joined into one long identifier for a barcode or SKU.
- Testing a concatenation function. You wrote code that joins numeric fragments into a single value and want a trusted reference output to compare against for several test cases.
- Merging paginated numeric fields. A form split a long numeric input across multiple fields for display purposes, and you need to merge the pieces back into one integer before processing.
Examples
Concatenate integer fragments
Input
12 34 56
Output
123456
Split on a custom separator
Input
12-34-56
Output
123456
About the Join Integers tool
Join Integers runs as plain JavaScript in your browser tab, with no server behind it. Merge partial integers into one larger integer by concatenation. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Integer Tools section, 133 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with the Input separator (blank = any whitespace) setting, and the result refreshes the moment you change it. 2 worked examples further down the page show exactly what the tool produces for real inputs.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Is Join Integers 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.