A rubber stamp is an image or pattern that has been carved, molded, laser engraved, or vulcanized onto a sheet of rubber. Rubber stamping, also called stamping, is a craft in which some type of ink made of dye or pigment is applied to a rubber stamp, and used to make decorative images on some media, such as paper or fabric.^[1][2][3][4]

A rubber stamp uses a raised-relief image molded into a sheet of rubber, often mounted onto a more stable object such as a wood, brick, or an acrylic block. For compactness, the vulcanized rubber image with an adhesive foam backing may be attached to a cling vinyl sheet which allows it to be used with an acrylic handle for support. These cling rubber stamps can be stored in a smaller amount of space, and typically cost less than the wood-mounted versions. They can also be positioned with a greater amount of accuracy due to the stamper's ability to see through the handle being used.

The ink-coated rubber stamp is pressed onto any type of medium such that the colored image is transferred to the medium. The medium is generally some type of fabric or paper. Other media used are wood, metal, glass, plastic, and rock. High-volume batik uses liquid wax instead of ink, with a metal stamp.

There are three main types of rubber stamp inking technology: traditional stamps with a separate ink pad, self-inking stamps with a self-contained die that flips to make an imprint, and pre-inked stamps where the die material is impregnated with ink.

Commercially available rubber stamps are marketed in three categories: stationery stamps for use in the office, stamps used for decorating objects, or those used as children's toys.

Rubber stamps for business commonly show an address, corporate logo and business registration number.^[5][6] Some stamps also have movable parts that allow the user to adjust the date or the wording of the stamp. They are used to date incoming mail, as well as to denote special handling for documents. In some countries it is common practice for formal documents such as contracts to be rubber-stamped^[7] over the signature as additional evidence of authenticity. The objective is to authenticate the contracts, prevent forging, and increases efficiency as company executives do not have to separately sign individual company documents.

Business stamps are commonly obtained from stationery stores or directly from manufacturers. They encompass a variety of types, including address stamps, standard word stamps like "received" or "payment due," and dater stamps. These stamps collectively account for nearly 30% of annual sales in the industry.^[8]

Rubber stamps are used beyond the business and office world. Applications range from education to marking animals to the food and drinks industry. A few are listed below:

• Education and teacher stamps
• Dietary requirements on food packaging
• Stamping food, e.g. meats (with food grade ink, e.g. Noris 111 meat marking ink^[9])
• Loyalty stamps, used to encourage repeat sales
• Arts and crafts, e.g. stamping impressions into soaps and clay
• Textiles
• Animal marking, e.g. pigeons before racing
• As travel-related collectables, e.g. Japanese eki stamps

Document marking can be done from within the user's word processor. This can be done manually by creating the "stamps" to appear on the documents in automated document marking software for Microsoft Word. This allows each page to be stamped as it is printed with the user-selected images created electronically.^{[citation needed]}

Materials besides rubber can produce a stamp. Woodcut and linocut, the carving of linoleum, are art forms based on the same principles. Linoleum is a harder material than rubber and requires additional pressure to carve. Woodcut is used by experienced artists, requiring both talent and patience.^[10] Rubber carving materials are often similar to that of linoleum and woodcut, such as sharp cutting heads, V and U tools^[11] Temporary stamps with simple designs can be carved from a potato or other semi-rigid food item.

Furthermore, photopolymer stamps are gaining popularity. They are most often produced in a set of coordinated images using a clear polymer material on an acetate carrier sheet for storage and packaging. The stamps are peeled from the carrier sheet and applied to a clear acrylic handle. This allows the stamper to view the image through the handle and effect precise placement of the image where desired. Photopolymer stamps are generally produced in the United States for sale domestically and internationally. Silicone stamps have many of the same properties of the photopolymer stamps. The creation of clear stamps facilitates the storage of a sizeable image collection, as they can all be used with a single set of handles of various sizes. They are also often very economical, being produced in sets of several images which work together to form a cohesive look.

Various methods can alter the appearance of carved stamps. Paints, pigments, and dye inks create different effects, extending the use of rubber stamping from paper to fabrics, wood, metal, glass, and so on.^[12] Ink pads can be purchased that allow for embossing, and there are markers that can be used to ink stamp pads with colors for a multi-color look. The use of rubber stamps can be combined with other materials. The image may be embellished by the addition of chalks, inks, paints, fibers, and a variety of other ephemera and embellishments.

Hand-carved rubber stamps find frequent use in mail art or artist trading cards, as they are typically small and allow the creation of a series of images. The TAM Rubber Stamp Archive^[13] has a collection of prints of rubber stamps mail-artists have used since 1983. Stamping is also often used in handmade cardmaking, scrapbooking, and letterboxing.

Stamping has become a very popular home-based craft, and there are a number of forums, some with many thousands of members. Craft stampers tend to be associated with other paper crafts, such as card making and scrapbooking.^[14][15]

Periodical publications for the stamping community have included RubberStampMadness, Creative Stamping, Rubber Stamper, and The Stampers' Sampler Magazine. The latter two periodicals appear to have stopped publishing.

• Seal (device)
• Where's George? an American website that uses rubber stamp marked dollar bills to track the movement of that currency around the world

• TAM Rubber Stamp Archive
• Stempelherstellung