Lot Date Cosmetic batch code checker for production date and expiry
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Muji Batch Code Location Guide

Find the right Muji batch code before decoding: check box, bottle, tube crimp, seal, and avoid barcodes, shade numbers, or SKU codes.

Locate the correct Muji batch code before using the checker. Failed lookups often come from entering a barcode, shade reference, or incomplete print instead of the production lot.

Last updated: 2026-09-05

  • Identify the manufacturing lot on the actual Muji product; its length and layout can differ between items.
  • Start with box bottom or product base, then confirm another package area if the print is faint.
  • Use one complete printed string from one location; do not merge box and bottle fragments.

Most likely Muji code locations

For Muji, start with the box bottom. If the outer box is missing, move to the product base and then the package seam.

Check the label around each marking to distinguish the production lot from product references; position and character count alone do not identify a lot.

  • Check the box bottom under bright side light.
  • Check the product base under bright side light.
  • Check the package seam under bright side light.

Numbers to ignore

Do not enter the retail EAN/UPC product number, shade number, SKU, ingredient registration number, or volume marking as the batch. Some scannable codes contain additional fields; use only an explicitly identified lot field, not the entire scan.

If several Muji codes appear, identify the production lot from its label and the instructions for that product. Length alone cannot identify it. Keep every mark with its original location and never trim a longer identifier to make it fit.

When the print is hard to read

Embossed or low-contrast batch codes are easier to read with side lighting. Take a photo, zoom in, and preserve leading zeroes, separators, and letter case.

If the box and container disagree, check whether one string is a product reference. Preserve both markings separately while confirming their purpose.

Muji product and package context

Inspect bottle and jar bases, rear labels, tube crimps, refill-pouch seams, compact backs, pencil or lipstick bottoms, mini containers, and cartons for a compact production mark. The 4550 product number, JAN barcode, 50 mL or 300 mL size, texture label, pump-head compatibility, and price are not the manufacturing lot.

Current Sensitive Skin lotion bottles are paired with separately sold 270 mL refills, and trial sets combine several 20 mL steps. A refill can be newer than the reusable bottle; a pump or spray head is an accessory rather than a formula; and MUJI household cleaners or aroma products require their own label and safety guidance instead of cosmetic PAO rules.