Data Matrix Barcode Generator

How a Data Matrix code stores data

Data Matrix is a two-dimensional symbology. Its data is arranged as a grid of dark and light square modules. An L-shaped finder pattern along two sides, and an alternating edge along the other two, tell a reader where the grid starts and how large it is. Because the data fills the whole grid, one symbol holds far more characters than a linear code of the same width.

The generator accepts any text from one to 1,500 characters, with no control characters such as line breaks or tabs. Unlike QR codes, the editor offers no error-correction level and no version picker: the grid size follows from the content, so longer text gives a larger square. Use the Size setting to control how big each module prints.

The generator does not keep a record of what you encode, count scans or redirect anyone. Whatever you type is stored in the image itself, so anyone who decodes the square reads the same text. Avoid putting private data into a code that will be printed on objects the public can handle.

Data Matrix suits applications where the code must survive small sizes and demanding surfaces, but it asks more of the reader than a linear code does. Test with the scanner your staff or customers actually use, because a 2D reader that works well on a screen may struggle with a small matte label in dim light.

How to make a Data Matrix code in three steps

1. 01

   Choose Data Matrix and enter the text

   Pick Data Matrix in Type, then type the text in Value. Use an example fills the field with a sample web address as text. The hint under the field gives the limit of 1500 characters, and the editor reports control characters if you paste them in.

2. 02

   Set the colors and the size

   Bar color sets the color of the dark modules and Background sets the rest. Size controls how large each module prints. Bar height does not apply to a square code, and Show the number has no effect on Data Matrix, so the preview shows only the square.

3. 03

   Preview, scan and download

   Scan the preview at the size it will print with a phone camera or a dedicated 2D reader. Download SVG for label printers and print shops, or PNG, JPG or WEBP for screens and documents.

Where Data Matrix codes are used

• Small electronic components

  Circuit boards, chips and connectors have little room for a label. A Data Matrix in a small area can hold a part number and a batch code in one square.

• Pharmaceutical and medical packs

  Packs in regulated supply chains often carry a two-dimensional symbol for lot and expiry data. Confirm the required content and format with your regulator and quality team before you design the pack, because this generator only draws the code.

• Laboratory samples

  Sample tubes and slides can carry a short code that points to a record in the lab system. A square code reads from any direction, so the tube does not have to be turned to a fixed angle.

• Industrial parts and tools

  Machined parts and tools often need a serial number too small for a linear code. A Data Matrix with a short serial keeps the mark readable on a surface only a few millimeters wide.

• Printed forms and file references

  A Data Matrix on a printed form or a document cover can hold a file reference that a scanner reads straight into a document system, without retyping.

Tips for Data Matrix codes that scan at small sizes

Keep the content short

The 1,500 character limit is the most a code can hold, but short text makes a smaller grid with larger modules, which prints and scans more reliably. Use a short link instead of a full record when you can.

Test the smallest size first

Scanners need enough resolution for each module. Print at the smallest size you plan to use and check the scan there, because a code that scans well on a screen may fail on the real part.

Keep a clear margin

A square code needs clear space around it. Leave the area free of other marks, and avoid placing the code over a seam, a curve or a textured edge where you can.

Use the contrast scanners expect

Dark modules on a light background read best. Inverse printing or laser marking can lower the contrast, so check the result on the actual material before you approve a run.

Data Matrix questions