Collection: Seal Carving Knife

From School-Use Seal Knives to Professional Seal Carving Knives

We offer a wide selection of seal knives, including brands like “Tenjin Seal Knife” and “Noshu Kanematsu Seal Knife,” as well as affordable Shoyu original seal knives.
They come in various types and sizes—square, round, single-edged, and double-edged. Please find the seal knife that best suits your preference.

Seal Knives, Also Known as Iron Pens

In calligraphy, brushes play the leading role; in seal carving, it is the seal knife.
A seal knife is essential for carving seals. To create a fine seal, having the right tool is just as important.
At Shoyu Online, we have prepared a range of seal knives that customers can use with confidence.

Types of Seal Knives

There are double-edged seal knives called “Chūhō” and single-edged ones called “Katahō.”
“Chūhō” is often used for stone materials: thicker blades work best for softer stones, and thinner blades are suited for harder stones. For wooden or bamboo seals, “Katahō” is generally used.
The size of a seal knife depends on the size of the seal being carved, but for a first purchase, a width of about 6mm is recommended.
In Shoyu Online’s seal knife section, we stock “Chūhō” knives, which are particularly recommended for stone carving.