How to Batch Rename Files in ComfortFiles

Select several files, right-click, and choose Rename… — ComfortFiles opens a batch rename dialog with a live preview. Pick a pattern, watch the new names update as you type, and apply them all at once. One ⌘Z undoes the whole batch.

Opening the dialog

Select two or more files or folders.
Right-click and choose Rename… (or press F2).
The batch rename dialog opens, listing every selected item with its Original and New name side by side.

Rename a single item and you get the plain inline rename instead — the batch dialog is only for multi-selection.

The four patterns

Pick a pattern from the tabs at the top. The preview updates live, so you always see the result before applying.

Find & Replace — replace text in every name. Type what to find and what to replace it with; tick Match case if case matters.
Add Text — add a prefix, a suffix, or both. The suffix goes before the extension, so report.pdf with suffix -final becomes report-final.pdf.
Number — number the files sequentially. Set a base Name, a Start value, and how many Digits to zero-pad to. With a name it produces Photo (001), Photo (002), …; leave the name empty and you get just 001, 002, ….
Extension — change the extension on all of them at once, e.g. txt → md.

Preview and conflicts

The preview flags problems before you commit: if a pattern would produce two identical names, or an invalid one, those rows are marked and the Rename button stays disabled until you fix the pattern. Nothing is written until every name is valid and unique.

Undo

Renamed the wrong set, or picked the wrong pattern? Press ⌘Z — the entire batch reverts in one step (“Undo Rename N Items”). Redo with ⇧⌘Z.

Just one file? Press F2 to rename it inline — undo reverts that too.
New to renaming files on the Mac and how it differs from Windows? Batch renaming files on a Mac.