Design shipping labels with sender/recipient addresses, tracking numbers, and barcodes for printing.
A shipping label is a document that scanners read as much as people do: two address blocks, a tracking number, and a barcode that must decode on the first pass. This tool arranges those parts on a printable label and renders the tracking number as a Code 128 barcode, computing the check character for you. What surprises most people is what it does not do: it never contacts a carrier. It will not create a tracking number, validate one, or book a shipment. The number you type is the number that prints, and the barcode is only as trustworthy as the characters you entered.
A concrete input and expected output from the current implementation.
Input
Tracking number 123456789012 (12 digits, no separators)
Expected output
A printable label whose Code 128 barcode encodes 123456789012 with check character 8; the human-readable line under the bars reads 123456789012
Code 128 appends a mod-103 check character so scanners can reject misreads: in Code Set B the start value is 104 and each digit's value is its ASCII code minus 32. The check value is (start + weighted sum) mod 103: the weighted sum for 123456789012 is 1568, adding the 104 start gives 1672, and 1672 mod 103 = 24, the character 8.
Sender and recipient addresses are entered in form fields and placed in the zones a carrier looks for: return address at the top, delivery address in the main block, tracking number and barcode below. Text wraps within each block, and the finished label is composed at the tool's target label dimensions so it prints on standard label stock without further formatting.
The tracking number is encoded as a Code 128 symbol, the symbology carriers use for tracking labels: each character maps to a bar pattern, a mod-103 check character is computed from the data and appended, and the digits are printed under the bars as the human-readable line. The check character lets a scanner reject misreads; the tool computes it so you do not have to.
A scanner will read the barcode, because it is a valid Code 128 symbol. Whether the post office can act on it is another question: only numbers registered with a carrier (from a purchased label or a booked shipment) resolve to a package. The tool creates no tracking record, so a number it did not receive from a carrier is a dead end.
Any printer can print it, but the barcode must come out at full size, sharp, and dark on white. Thermal printers are common because they match standard label stock; on a normal printer, disable fit-to-page and scaling, print at 100 percent, and scan-test the result, since ink smearing or resizing makes the bars unreadable.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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