Multiply Matrices
Find the product of 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 Multiply Matrices
- 1. Paste both matrices. Enter the first matrix's rows, then a blank line, then the second matrix's rows. The first matrix's column count must equal the second matrix's row count.
- 2. Set the element separator. Choose Element separator to control how values are split within each row, matching whether your source data uses spaces, commas, or another delimiter.
- 3. Copy the product matrix. The result appears with the shape of the first matrix's row count by the second matrix's column count. Copy it for a homework answer or further calculation.
When to use Multiply Matrices
Multiply Matrices computes the standard matrix product of two matrices, summing row-column dot products across every entry. It replaces the tedious manual arithmetic of computing each cell of the result one at a time.
- Checking a linear algebra homework answer. You multiplied two matrices by hand for a course assignment and want to verify every cell of your result before submitting, since one arithmetic slip anywhere invalidates the whole answer.
- Composing successive transformations. In a graphics or game project you have two transformation matrices, like a rotation and a scale, and want the combined transform matrix that applying both in sequence produces.
- Verifying a matrix library implementation. You are implementing matrix multiplication in a small numerical library and want trusted reference products for a handful of test matrices, including non-square ones, to validate your indexing logic.
- Working through a Markov chain over multiple steps. A probability exercise asks for the transition matrix after two steps, which means multiplying the transition matrix by itself, and getting a quick verified product avoids repeating the dot-product arithmetic.
Examples
Product of two matrices (blank line between them)
Input
1 2 3 4 5 6 7 8
Output
19 22 43 50
About the Multiply Matrices tool
Multiply Matrices runs as plain JavaScript in your browser tab, with no server behind it. Find the product of 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
Does Multiply Matrices cost anything?
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?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
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?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
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.