Add Matrices
Find the sum of two or more matrices. 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 Add Matrices
- 1. Paste your matrices. Enter two or more matrices in the input pane, one row per line and a blank line separating each matrix. All matrices must share the same number of rows and columns to be added.
- 2. Set the element separator. Use the Element separator option to tell the tool how numbers within a row are divided, such as a space or a comma. Match it to the format you pasted so parsing lines up correctly.
- 3. Read the summed matrix. The output shows a single matrix where each cell is the sum of the corresponding cells across every input matrix, keeping the same row and column layout you started with.
- 4. Copy the result. Copy the summed matrix from the output pane and paste it wherever you need it next, whether that is a spreadsheet, a script, or a homework write-up.
When to use Add Matrices
Add Matrices sums two or more matrices of the same size, cell by cell. This is the basic operation behind combining transformation matrices, accumulating grids of measurements, or checking a linear algebra homework answer by hand.
- Combining transformation grids. You have separate matrices representing offsets or adjustments applied to a dataset, such as sensor calibration corrections, and need the combined effect as one matrix instead of applying each one in sequence.
- Checking linear algebra homework. A textbook problem asks you to add two 3x3 matrices by hand and you want to verify your arithmetic before submitting the assignment or moving on to the next step of a larger proof.
- Merging tabular numeric data. Two spreadsheets export grids of the same shape, like monthly sales by region, and you need their sum without opening a spreadsheet program, just by pasting both blocks of numbers here.
- Prototyping a small simulation. You are hand-testing a physics or graphics routine that accumulates matrices frame by frame and want to confirm the summed state matches what your code produces before debugging further.
Examples
Sum of two matrices (blank line between them)
Input
1 2 3 4 5 6 7 8
Output
6 8 10 12
About the Add Matrices tool
Add Matrices runs as plain JavaScript in your browser tab, with no server behind it. Find the sum of two or more matrices. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Math Tools section, 234 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 Element separator setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
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 Add Matrices 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.