The reason why the certificate of origin was not stamped after downloading may be due to the problem of scanning pixels. According to the above basic ideas, the scanning of Chinese and English seals and signatures should meet the following requirements:

1. scanning pixel: it should reach more than 600dpi to ensure clear scanned image.

2. Specifications: For seals and signatures with different shapes, the corresponding specifications should be followed. For example, the diameter of a circular seal is not more than 4.5 cm, the length and width of a rectangular seal are not more than 5.5 cm, the major axis and minor axis of an oval seal are not more than 5.5 cm and 4.5 cm respectively, and the length and width of signature handwriting are not more than 3.5 cm and 3 cm respectively.

3. Location: The seal or signature should be in the center of vertical A4 blank paper, and the whole A4 paper should be scanned and uploaded.

4. Color: the seal is scanned in color, and the signature is scanned in black and white.

If the above requirements are met, the downloaded certificate of origin should contain clear seal information.