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change file extension with power automate

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Posted on by Community Power Pla... Microsoft Employee

Is it possible to change an existing file's extension in a SP document library? I have seen many example on renaming the file's name but not the actual extension. For example is a file's name is file.html can i change it to file.aspx without having to create a new file and deleting the old one? Thanks!

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GeorgiosG 1,013 Super User 2024 Season 1 on at

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Hi @Anonymous ,

I am not aware of an action for simply changing the file type with one action in Power Automate. you can Create a new file with the content and just pass in file name the new format with a concat() function. You can use directly Name with .xlsx like in my screenshot or use an expression
concat(FileName,‘.docx‘)

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Community Power Pla... Microsoft Employee on at

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Thank you your response, I was aware of this but i was looking to retain the document id and not have to create a new one and delete the old file.

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GeorgiosG 1,013 Super User 2024 Season 1 on at

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Maybe you can use the SharePoint API with the Send HTTP Request to SharePoint action.
maybe you can go with that approach

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Community Power Pla... Microsoft Employee on at

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I tried this and got the flow to work however, it is not working as we expect. If the file already stored in the library is <FileName.aspx> and i want to change it to <NewFile.txt> the flow will run successfully but it only changes the file's name not the extension. I end up getting NewFile.html

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GeorgiosG 1,013 Super User 2024 Season 1 on at

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Are you also passing in the extensions ?

I made a quick research and also found that it Wald solved with another api endpoint, maybe that helps https://powerusers.microsoft.com/t5/General-Power-Automate/Renaming-SharePoint-file-using-REST-API-with-Power-Automate-cuts/td-p/853435

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Community Power Pla... Microsoft Employee on at

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Yes i am passing the filename and extension within the body liek below. I even tried the new endpoint and it doesnt not change the actual extension.

{
"formValues":[
{
"FieldName":"FileLeafRef",
"FieldValue":"Filename.txt"
}
]
}

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farsamigmail 30 on at

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Hi,

Is there any solution for changing file extensions?

Thank you

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spoofan 4 on at

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It is not working anymore. I ended up by creating a new file, setting up the properties and deleting the old one.

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lroade 2 on at

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Hello Spoofan,

How did you set up the properties? I have deleted the old one and created a new one named .xlsm and it wont open because it says the extension does not match.

Could you send screenshow of your flow? thanks!

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SemiAwakeNic 2 on at

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Not sure if it's against the rules to post AI answer, but this answer by Copilot worked for me.

You can indeed use HTTP requests in Power Automate to change a file extension on SharePoint. Here's a step-by-step guide on how to do it:

Trigger: Start with a trigger that suits your needs, such as "When a file is created or modified" in a SharePoint library.

Send an HTTP request to SharePoint:

Site Address: Your SharePoint site URL.

Method: POST.

URI: _api/web/GetFileByServerRelativeUrl('/sites/YourSite/Shared Documents/YourFileName.old')/moveto(newurl='/sites/YourSite/Shared Documents/YourFileName.new',flags=1)

Headers:
json { "Accept": "application/json;odata=verbose", "Content-Type": "application/json;odata=verbose" }

This HTTP request uses the moveto method to rename the file, effectively changing its extension[1][2].

Here's a more detailed breakdown:

Trigger: Choose a trigger that fits your scenario, such as "When a file is created or modified".

Send an HTTP request to SharePoint:

Site Address: Enter your SharePoint site URL.

Method: Select POST.

URI: Use the following format:

_api/web/GetFileByServerRelativeUrl('/sites/YourSite/Shared Documents/YourFileName.old')/moveto(newurl='/sites/YourSite/Shared Documents/YourFileName.new',flags=1)

Replace YourSite, YourFileName.old, and YourFileName.new with your actual site name and file names.

Headers: Add the following headers:

{ "Accept": "application/json;odata=verbose", "Content-Type": "application/json;odata=verbose" }

This method allows you to rename the file, effectively changing its extension without needing to download and re-upload the file.

Would you like more details on any of these steps or help with setting up the flow?

References

[1] HOW TO: Change file extension of an existing item in SharePoint ...

[2] Power Automate – Rename SharePoint file – Cloudkumpel

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