2,000 Files, Five Free Bulk Renamers, and the Counter Setting That Ate My Vacation Photos
The Folder That Started It All
Every couple of years I let a folder called To Sort grow until it becomes a personal insult. This time it hit 2,000 files: vacation photos from a road trip out to Yellowstone, scanned receipts I keep meaning to hand to my accountant, and a depressing number of PDFs named things like document (7).pdf and download-4-final.pdf.
I wanted order. I did not want to click each file and retype its name. So I copied the whole mess five times and handed it to five free bulk-renaming utilities: PowerRename from Microsoft PowerToys, Bulk Rename Utility, Advanced Renamer, ReNamer, and Ant Renamer.
The test was simple. Could each tool rename a real-world pile without making me nervous? Could I preview the result clearly? Could I undo a mistake? And — this turned out to matter most — could it stop me from doing something spectacularly dumb?
The Rules of the Test
I used the same 2,000-file folder for each tool and checked five things: preview clarity, regex support, undo safety, Explorer integration, and how the tool behaved when a rule did something I did not expect. I did not time anything down to the millisecond, because the real question was not speed. It was whether I would trust the tool with files I could not easily recreate.
PowerRename: The One That Lives in Right-Click
PowerRename comes with Microsoft PowerToys, and it is the easiest of the bunch to live with. You right-click a selection in File Explorer, choose PowerRename, and get a clean preview with checkboxes. You can use plain find-and-replace or flip on regular expressions. The preview updates as you type, and if you hate the result, Ctrl+Z in Explorer usually brings the old names back.
For quick jobs — fixing a batch of scan0001.pdf files or adding a trip name to a set of photos — it is hard to beat. The limitation is that it is more of a scalpel than a workshop. If you need to reorder parts of a filename, insert dates from file metadata, or build a multi-step rule, you will feel the ceiling.
Bulk Rename Utility: Power Without a Safety Net
Bulk Rename Utility is the tool your IT uncle recommends. It is free, it is ancient-looking, and it can do almost anything. The preview panes are genuinely detailed. The problem is that the interface looks like a cockpit from 2003, and every checkbox is live.
This is the tool that created my numeric crime scene. I was trying to add a date prefix to my Yellowstone photos, but I also enabled a numbering option and set the name field to remove the original filename. The preview did show what would happen. I had scrolled past the relevant column and assumed the old names were still in there. One click later, every vacation photo was named 0001, 0002, 0003, and so on. The trip was still there — the context was gone.
Bulk Rename Utility does not have a friendly undo button. I restored the folder from a backup, which is the only reason this story has a happy ending. The tool is powerful and free, but it assumes you know exactly what you are doing. For everyday users, that is a tough sell.
Advanced Renamer: The Adult in the Room
Advanced Renamer felt like the tool built by someone who has made a naming mistake before. The interface is plain but organized. You add rules in a list, see a full preview, and — crucially — there is an undo option for the last batch. It handled all 2,000 files without drama.
I used it to rename receipts by date and type, then to clean up the downloaded PDFs with a regex rule that removed the junk suffixes. The preview was readable, and when I deliberately made a bad rule, the undo button brought everything back. That single feature is worth more than a dozen advanced options I will never use.
ReNamer: Fine, If You Like Rules
ReNamer is a serious tool with a stack of rules you can reorder like a recipe. It supports regex, case changes, serialization, and more. The preview is solid. But the undo situation is less comforting: you generally need to build a reverse rule or restore from backup. That is fine for someone who renames files every week. For the rest of us, it is one more thing to remember under pressure.
Ant Renamer: Simple and Honest
Ant Renamer is the lightweight of the group. It is free, small, and straightforward. You get basic find-and-replace, numbering, and a preview. Regex support is limited, and there is no real undo safety net. It is a perfectly good tool for a simple batch of files, but it is not the one I would trust with a family photo archive.
What Actually Mattered
Preview is not a safety feature if you do not understand what you are previewing. Bulk Rename Utility showed me the numeric result, but I was moving too fast to read it. The tools that earned my trust were the ones that made the preview obvious and gave me a way back.
Explorer integration mattered more than I expected. PowerRename wins there because it is already part of my right-click menu. Regex support sounds impressive, but most everyday renaming jobs do not need it. And undo is the feature that separates a useful utility from a liability.
The Verdict
For everyday PC users, Advanced Renamer is the one I would install first. It has a clear preview, a real undo option, and enough power for receipts, photos, and downloaded PDFs without feeling like a control panel for a spaceship.
PowerRename is the best choice for quick, right-click jobs in File Explorer, especially if you already use PowerToys. Bulk Rename Utility stays on the list for tinkerers who keep backups and read every column. ReNamer and Ant Renamer are fine tools, but they did not make the case for a permanent spot on my machine.
And the vacation photos? They are back to their original names, plus a date prefix. I did not need a numeric crime scene to learn that the undo button is the most important feature in any renaming tool.
