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How to put a stamp on an envelope 
Check the size of your envelope. 
This should be marked on the packet of envelopes, or on the envelope itself. Size 14 envelopes measure 5 " x 11. 5 " and are considered the standard size.


 (a). Expect standard size 0.073.2 inches. Make sure you look at the envelope closely before you move it in or out of your hand..
 (b). They will be rectangular in shape and will often be sold in packages at your local post office. You can also mail a letter in an envelope that is smaller than a size 14, such as a size 10 envelope (4.125 " x 9.5 "), with a regular stamp..
 (c). Larger envelopes place a stamp on the envelope and can be stamped before a person or organization. Smaller envelopes may be signed with a paper stamp or with envelopes stamped with pen..
 (d). Fold and press down firmly onto the envelope. You have now created a stamp! Measure your envelope for size 14..
(b).