What is the difference between inline and offline coding?
When it comes to printing batch codes, expiry dates, barcodes or other variable data on packaging, you’ll usually hear two main terms: inline coding and offline coding. Both do the same job – printing information onto your products – but they do it in different ways, and each suits different types of production setups.
Inline coding: Part of your production line
Inline coding means the printer is integrated directly into your main production line. As your product moves through the process – being filled, sealed, or packaged – it passes under a printer or labeller, which applies the code in real time.
Pros:
- Fast and efficient: Ideal for high-speed lines
- No extra handling: Products are printed as part of the flow
- Great for high-volume production
Common setup:
- Continuous Inkjet (CIJ) printers like the alphaJET are often used for inline coding, thanks to their speed and ability to print on a variety of materials like plastic, metal, or film.
Offline coding: Separate from your main line
Offline coding is done before or after the main production process. It usually involves a carton or sleeve feeder, like the udaFORMAXX, which feeds flat cartons, sleeves or inserts through a printer (and/or labeller). This is common for packaging that’s easier to code before it’s formed or filled.
Pros:
- High print quality: Flat items = clearer, more consistent codes
- More flexibility: Easier to handle short runs, design changes, or different formats
- Less disruption: No need to pause your main line for coding issues
Popular for:
- Coding and / or labelling cartons, sleeves, or leaflets in pharma, food, and cosmetics
So, which is right for me?
- If your production is high-speed, high-volume and consistent, inline coding is likely the best fit.
- If you need versatility, higher print quality, or want to code in batches outside your main line, or if you simply want to replace hand labelling or stickering, offline coding gives you more control.
Some businesses even use both – coding some elements inline, and others offline depending on packaging type or print complexity.