Extract the text from PNM image
DevConverter also is an online OCR (Optical Character Recognition) service, can analyze the text in any image file that you upload, and then convert the text from the image into text that you can easily edit on your computer
Bitmap image created in the Portable Any Map format, which was designed to handle several types of portable monochrome, grayscale, and color images; may include raster graphic data in a .PBM, .PGM, or .PPM format; may be stored using binary data or ASCII text.
TXT is a document file format that supports plain text. Almost all the applications recognize and support TXT file because it does not contain any text formatting. Also all the Operating Systems and devices support this file as it contains the ASCII characters only.