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

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 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
New in 5.1 | Last modified in 6
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