微缩印刷，又称微小字，是一种在纸币、银行支票以及其他有价印刷品和证件上广泛使用的防伪技术。在纸币或者其他一些印刷品上的不起眼的地方，通常都会使用缩微印刷技术——一些文本使用极小的字号来印刷，以致于肉眼很难辨认。比如在2004年版20美元纸币上，微缩印刷技术用在了纸币正面左下角，同时以“Twenty USA”组成的背景中也使用了这一技术。有时设计者并不有意地把微缩文本隐藏起来，甚至有可能直接用文本警示造假者印刷品上有微缩文本，不要试图伪造。在美国的大多数支票上，支票持有人签名地方的横线就由微缩文本印制而成，微缩印刷线通常都包含有用微缩印刷技术印制的字符。微缩印刷字符中有时可能包含易被忽视的拼写错误，比如旧版的芬兰护照中，反复出现的微缩文本"Suomi Finland"被错误的拼写成了"Soumi Finland"。

Microprinting is the production of recognizable patterns or characters on a printed medium at a scale which requires magnification to be read. To the unaided eye, the text may appear as a solid line. Attempts to reproduce by methods of photocopy, image scanning, or pantograph will be translated as a dotted or solid line to the reproduction machine which cannot identify and recreate patterns to such scale. Microprint is predominantly used as an anti-counterfeiting technique due to its inability to be easily reproduced by digital methods.