About Mass Rename

An independent product, not a company with a support department.

Mass Rename is a browser-based batch file renamer at massrename.com. It takes a CSV, XLSX or TSV table of current and new file names, applies it to the files you drop into the page, and returns a renamed ZIP plus a CSV report. The files are read and rewritten inside the browser tab; they are never uploaded to a server.

It exists because the same job keeps showing up in different clothes: product photos that need SKUs, scans that need invoice numbers, client deliveries that need the names from a shot list. The names already exist in a spreadsheet. Re-typing them into a rule-based desktop renamer, or writing a one-off script, is the part that wastes an afternoon.

Who makes it

Mass Rename is built and maintained by gowinder, an independent developer. The author's other work is on github.com/gowinder.

The same author also runs eldertongue.com, an English-language dictionary of Old English. The two sites share an author, not a codebase.

How it is built

The interface and the rename engine run in your browser. There is no account, and no copy of your files is sent to a server: the spreadsheet is parsed and the renamed ZIP is built inside the tab. The site records anonymous usage events for the tool's main actions, never file names, file paths or file contents. A free batch covers 50 files; a $19 one-time licence removes the limit, with a 30-day refund.

Contact

Refunds, licence problems and bug reports go to the addresses on the contact page. If you are reporting a rename that did not match, include the report CSV — it names the rows that were skipped and why.