If I search on “.jpg” I will get all the files I’m not looking for. If I search on “jpg” I will end up with all the files, whether they have the dot or not. There is an “ends with” option but not a “does not end with”. There is a “contains” option, but not a “does not contain” option. Certain image files I use in a genealogy program somehow lost the dot before the extension, for instance, image_example.jpg became image_examplejpg. However, there’s something I need to do that I can’t figure out how, though, with Finder’s Find/Replace or Rename functions, Automator, Easyfind, or BetterFinderRename. It’s nice to know this feature is built into Sierra. You could also accomplish this batch extension changing process through the command line using a variation of this trick, we’ll cover specifics for that in another article. Generally speaking it’s a good idea to leave the extension change warning enabled, however.
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Once you’re finished changing the group of files file extensions you are free to adjust your Finder Preferences back to whatever setting you’d like. Beyond that, it’s just a matter of using the batch Rename feature built-in “Find and Replace” functionality as shown.
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The extension you are choosing does not matter, though you’ll obviously want to pick one that is compatible and accurately represents the file type otherwise it may make it unreadable to some applications.Ī few important points here: you must have show file extensions enabled on Mac otherwise the file extensions to change will not be visible or found by the replace tool, and secondly you must turn off the file extension change warning otherwise you will be repeatedly confronted with a dialog box to confirm the file extension has changed for each individual file extension change. In the example above we changed a group of image files from having a “.jpeg” file extension to having a “.PNG” file extension, but you can use this with any file extension, whether it’s changing a group of files from having. At the “Rename Finder Items” screen choose ‘Replace Text’ and then within the “Find:” section place the initial file extension, and under the “Replace with:” input place the file extension you wish to batch rename all of the selected files to, then click on “Rename”Īssuming you followed the above steps correctly, you will successfully have changed only the file extensions of the selected files, and not changed any of the names.Now locate the files or folder of files that you want to change the file extensions for in the Finder and select them all, then right-click (or Control Click) and choose “Rename XX Items…”.Check the box for “Show all filename extensions” and then uncheck the box for “Show warning before changing an extension”, then close out of Finder preferences.From the Finder of the Mac, pull down the “Finder” menu and go to “Preferences” and then go to “Advanced”.It’s a subtle difference but important if all you want to do is maintain file names but change the file extensions. We’re going to use the same rename feature that allows batch renaming of files on the Mac but with a few slight modifications to the usage and related system preferences so that it focuses on changing the file extension rather than the file name. This is also not changing the file names, it is only changing the extension that comes as a file suffix. We have plenty of articles about various file format and type conversions if you’re interested in that, however. Remember this is only changing the file extension, this is not actually changing the file type or performing any file conversion.
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