EAN-13 Check Digit
Compute EAN-13 check digits and validate barcodes online. GS1 Modulo-10 with instant feedback.
EAN-13 check digit
GS1 Modulo-10: odd positions ×1, even ×3 (from the left, first 12 digits).
Result
8999999123451
How to use
- Paste input or drop a file above.
- Adjust options (delimiter, dialect, quality, ratio).
- Copy result or download — no sign-up needed.
FAQ
12 or 13 digits?
12 computes the 13th; 13 validates the whole code.
Does valid mean registered?
No — checksum only. Registration lives with GS1.