is an option for Cell and Notebook that holds the assigned unique UUID string.


  • ExpressionUUID is managed automatically by the front end and cannot be manually assigned, queried or inherited as a typical notebook front end option.
  • All notebooks and cells have an ExpressionUUID option written to the file when the file is saved.
  • Functions that read the contents of open notebook windows such as NotebookGet and NotebookRead will not include the value of ExpressionUUID in their results. This helps to ensure that a UUID does not get reused when programmatically modifying notebooks using such commands.
  • The UUID designated by ExpressionUUID is the same as the one used in the first argument of NotebookObject and CellObject to uniquely identify a given instance of a cell.


Basic Examples  (1)

Query the ExpressionUUID of a cell using Developer`CellInformation:

Use NotebookLocate to locate the cell with the given ExpressionUUID:

Wolfram Research (2021), ExpressionUUID, Wolfram Language function, (updated 2022).


Wolfram Research (2021), ExpressionUUID, Wolfram Language function, (updated 2022).


Wolfram Language. 2021. "ExpressionUUID." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2022.


Wolfram Language. (2021). ExpressionUUID. Wolfram Language & System Documentation Center. Retrieved from


@misc{reference.wolfram_2024_expressionuuid, author="Wolfram Research", title="{ExpressionUUID}", year="2022", howpublished="\url{}", note=[Accessed: 12-July-2024 ]}


@online{reference.wolfram_2024_expressionuuid, organization={Wolfram Research}, title={ExpressionUUID}, year={2022}, url={}, note=[Accessed: 12-July-2024 ]}