Prettify a Matrix
Neatly align columns. 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 Prettify a Matrix
- 1. Paste your matrix. Enter the matrix as rows on separate lines, with values separated by spaces. Rows do not need to already be aligned since the tool computes the alignment for you.
- 2. Set the decimal places. Choose Decimal places if your matrix contains decimals, so every entry is rounded to the same precision before the columns are padded to line up.
- 3. Copy the aligned matrix. The output pane shows every column right-aligned to the widest entry in that column. Copy the neatly formatted matrix into a monospace document, code comment, or terminal output.
When to use Prettify a Matrix
Prettify a Matrix right-aligns every column so numbers of different widths line up visually, turning a ragged block of numbers into a readable grid. It solves the same problem as prettifying JSON, but for matrices instead of nested objects.
- Cleaning up a homework matrix before submission. You typed out a matrix quickly while solving a linear algebra problem and the columns do not line up, making it hard to read at a glance, so prettifying it produces a submission-ready block.
- Formatting output for a monospace terminal or README. A script prints a matrix of results with inconsistent spacing, and pasting it here produces aligned columns that read cleanly inside a code block in documentation or a terminal log.
- Preparing a matrix for a code comment. You want to embed a small example matrix in a comment above a function that performs matrix operations, and a properly aligned version communicates the shape far better than raw unaligned numbers.
- Comparing two matrices side by side. When debugging a numerical algorithm, aligning the matrix output makes it far easier to spot which specific entry differs from the expected result compared to scanning unaligned rows.
Examples
Right-align columns
Input
1 200 3 40 5 6000
Output
1 200 3 40 5 6000
Fixed decimal places
Input
1 2.5 30 4
Output
1.00 2.50 30.00 4.00
About the Prettify a Matrix tool
Prettify a Matrix is a free online tool that works entirely inside your web browser. Neatly align columns. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 234 Math utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with the Decimal places 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.
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
Does Prettify a Matrix 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.