About UPU S10
UPU S10 is the Universal Postal Union's international item identifier: 2 service letters, 8 serial digits, 1 check digit, 2 country letters (e.g. RR123456785DE) – encoded as Code 128.
Data format
13 characters: AA + 8 digits + check digit + country code. If the check digit is missing (12 chars) it is computed.
Example: RR123456785DE
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 UPU S10
Is the UPU S10 generator really free?
Yes. You can create as many UPU S10 barcodes as you like and download them as PNG or SVG – no registration, no watermark, commercial use included.
What resolution does the UPU S10 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 UPU S10 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.