Generally, the seals of domestic companies are red, while those of foreign companies are blue. Sometimes for the convenience of work, two similar seals are distinguished by two colors.

The general seal shape is not clearly defined, but some special seals are: invoice seal is oval, contract seal and customs declaration seal are mostly oval, official seal is round, and foreign official seals are mostly oval and polygonal. Sometimes for the convenience of work, two similar seals will be distinguished by two or more shapes.

Extended data:

China does have certain requirements for the official seal management of foreign-funded enterprises, such as scale and size, but it does not stipulate that it must be blue, because there is no deliberate requirement, but the official seals of foreign-funded enterprises are generally red or blue.

1. Generally speaking, companies and factories in China use red seals.

Two, the original manual version of the special VAT invoice stamped with the enterprise name, address, tax number and account number and other billing enterprise information in blue, and the quarantine seal is also blue.

3. Generally, the seals of foreign companies are mostly blue, and those of Hong Kong and Taiwan provinces are also blue.

4. Blue is generally used internationally, and red is generally used at home.

5. Chinese-foreign joint ventures also have blue seals, and foreign companies should sign (seal) which has legal effect and authority.

Baidu encyclopedia? -Seal (text explanation)