How to Change File Extension in Android and Windows 10

Changing file extension is a simple task. In this post, we'll see the steps to do this task in Android and Windows 10.

Change File Extension of an Individual File in Android

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    ​Open the default file manager (the file manager that comes with your Android device).
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    Go to the location where you have the file for which you want to change the file extension.
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    Select the file by long pressing it.
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    Tap Overflow Menu (three vertical dots) at the top and then tap "Rename."
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    In the "Rename" popup, move the cursor to the end. Clear the existing file extension and provide the one you want. In our instance, I have removed png and provided the one I want (bak).
Rename popup with the bak file extension
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    ​Hit "OK."
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    Now, you can see "Confirm Rename" popup. Make sure to read the popup message and if you are OK with it, tap "OK."
Confirm Rename popup
File with the bak file extension

That is all. The file extension is successfully changed.

Change File Extension of Multiple Files at Once in Android

Typically, using the default file manager, you cannot change the file extension for multiple files at once.

However, you can do this task with the help of a third-party file manager. Let's see the steps to do this task.

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    ​Install and open ES File Explorer File Manager app.
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    Go to the location where you have files for which you want to change the file extension.
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    Select the files you want.
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    Tap "Rename" which is beside "Delete."
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    In the "Batch Rename" popup, you can see "Rename extension name" option.
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    Provide the extension you prefer in that option.
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    Tap "OK."
Batch Rename popup with the bak file extension
Files with the bak file extension

Change File Extension of an Individual File in Windows 10

Selected File name extensions option
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    Find the file for which you want to change the file extension.
Text file
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    Right-click on it and then click "Rename." 
Rename option in the context menu
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    Remove the file extension which is after the dot(.). Type the file extension you want and then hit "Enter" key. In this instance, I removed txt and replaced it with the HTML.
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    In the confirmation popup, click "Yes."
Confirmation popup

That is all. You've successfully changed the file extension.

HTML file

Change File Extension of Multiple Files at Once in Windows 10

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    Put all the files for which you want to change the file extension into a single folder.
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    Open that folder. Right-click on the File Explorer Address Bar and then click on "Copy address" option. It will copy the address of the folder.
Copy address option
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    Open Command Prompt.
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    Type cd. Hit "Space Bar" key and then paste the address of the folder you've copied (see the screenshot below). Press "Enter" key.
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    Now, type the following command:

ren *.* *.html

Command Prompt with commands including the command to change the file extension of multiple files
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    Replace HTML with the file extension you want. Press "Enter" key. 

That is all. Now, you can see that all files in the folder got its file extension changed.

HTML files

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How to Change File Extension in Android and Windows 10

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