To bulk rename formats or extensions, you can use dedicated GUI software tools, native command lines, or operating system shortcuts.
Depending on your comfort level and operating system, you can use the following methods to safely change extensions for hundreds of files at once. Option 1: Microsoft PowerToys (PowerRename)
If you prefer a clean, integrated interface in Windows, Microsoft PowerToys features a tool called PowerRename. This method allows you to use search-and-replace strings directly inside File Explorer.
Step 1: Download and open PowerToys, navigate to PowerRename, and switch the toggle to Enable PowerRename.
Step 2: Open File Explorer, select all target files, right-click them, and choose PowerRename.
Step 3: In the formatting window, check the box next to Use Regular Expressions.
Step 4: In the Search for box, type .(old_extension)\(</code> (e.g., <code>.png\)).
Step 5: In the Replace with box, type .new_extension (e.g., .jpg).
Step 6: Preview the live results in the right-hand panel and click Apply. Option 2: Bulk Rename Utility (Advanced & Heavy Workloads)
For absolute control over massive datasets or complex criteria, the free Bulk Rename Utility is a highly recommended tool. Step 1: Download and install Bulk Rename Utility.
Step 2: Launch the application and use the top-left folder tree to open your file directory.
Step 3: Highlight all the files you intend to change in the center window frame.
Step 4: Locate Section 11 (Extension) in the bottom configuration grid.
Step 5: Change the dropdown menu from Same to Fixed, and type your target format (e.g., txt) into the text bar.
Step 6: Review the green text updates in the live Preview Section.
Step 7: Click the large Rename button in the lower right corner to process. Option 3: Command Prompt / Terminal (No Software Required)
If you do not want to download third-party software, you can execution-swap formats natively in one line of code.
Bulk Rename Utility • View topic – Changing a file extension
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