About Royal Mail Mailmark 2D
Mailmark 2D is a Data Matrix variant (type 7: 24×24, type 9: 32×32, type 29: 16×48) with Royal Mail data structure for letters and large letters with postage tracking. Customer data may follow the mandatory 45-character part.
Data format
Mailmark data string (starts with JGB), 45 to 90 characters.
Example: JGB 012100123412345678AB19XY1A 0
Postal Codes
Postal barcodes are used by postal operators for automatic sorting and tracking. Many are 4-state codes (ascender, descender, tracker, full bars) that fit even in narrow address areas.
Frequently asked questions about Royal Mail Mailmark 2D
Is the Royal Mail Mailmark 2D generator really free?
Yes. You can create as many Royal Mail Mailmark 2D barcodes as you like and download them as PNG or SVG – no registration, no watermark, commercial use included.
What resolution does the Royal Mail Mailmark 2D barcode have?
PNG files are generated with adjustable module width and up to 600 DPI. For print we recommend the lossless SVG vector format which scales without any quality loss.
Is my data stored?
No. The barcode content is only processed to render the image and is not stored. We only count anonymously how often a barcode type is used.
Can I embed Royal Mail Mailmark 2D barcodes in my website or software?
Yes. Every barcode has a stable image URL (see “Embed HTML”) which you can use in websites, label software or spreadsheets.