ASCII text can contain non-printable characters which will not be visible when you open a text file in NotePad. The non-printable characters include not only line feeds and carriage returns, but also characters such as those used to mark the end of text; end of transmission; tabs; and file separators.
![](https://static.wixstatic.com/media/af7fa4_76b951ef303644019032955bf268ad99~mv2.png/v1/fill/w_68,h_27,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/af7fa4_76b951ef303644019032955bf268ad99~mv2.png)
To review these characters, enter the text in an advanced text editor such as NotePad ++.
![](https://static.wixstatic.com/media/af7fa4_9d49ed44eb214a138da3cf01cf0dcf75~mv2.png/v1/fill/w_80,h_33,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/af7fa4_9d49ed44eb214a138da3cf01cf0dcf75~mv2.png)