• Import can read any file as a sequence of unsigned 8-bit integers.
  • Export writes a list of integers in the range to a binary file.


    Sequence of unsigned 8-bit integers.
    Raw binary format.
    Equivalent to the Byte format.

Import and ExportImport and Export

  • Import["file","UnsignedInteger8"] imports any file, returning a packed array of integers in the range .
  • Export["file",list,"UnsignedInteger8"] exports a list of integers in the range to file.
  • Import["file",{"UnsignedInteger8",elem}] or Import["file",elem ] imports the specified element from file.
  • Import["file",{"UnsignedInteger8",{elem1,elem2,}}] imports multiple elements.
  • See the reference pages for full general information on Import and Export.
  • ImportString and ExportString support the UnsignedInteger8 format.


  • General Import elements:
  • "Elements" elements and options available in this file
    "Rules"full rules for each element and option
    "Options"rules for options, properties, and settings
  • Data representation element:
  • "Data"list of integers in the range
  • By default, Import and Export use the "Data" element.
  • Import["file",{"UnsignedInteger8",n}] gives the n^(th) 8-bit integer from file.
  • Trailing bytes are ignored if the size of the imported file is not a multiple of the data size.


  • Import option:
  • "HeaderBytes"0how many bytes to skip at the beginning of the file

ExamplesExamplesopen allclose all

Basic Examples  (1)Basic Examples  (1)

Convert a list of integers to a string representing binary 8-bit unsigned integers:

Click for copyable input

Convert the binary data back to an expression:

Click for copyable input

Import the same data, assuming it represents an array of 8-bit characters:

Click for copyable input

Skip the first 10 bytes on Import:

Click for copyable input
Introduced in 2004
| Updated in 2007