Bulk Renamer vs Renamer.ai

Bulk Renamer is a free desktop app for batch-renaming files in a chosen folder, available for Linux, macOS, and Windows. It displays a live preview of each proposed filename before applying the batch. Rename patterns can combine find-and-replace, prefixes or suffixes, sequential numbering, case conversion, and extension changes; find-and-replace accepts plain text or regular expressions. The app loads files from the selected folder but does not include subfolders. Before a batch runs, it checks whether destination names duplicate one another or already exist on disk, and a conflict blocks the operation. Undo reverses the latest successful batch only. That history is kept in memory and does not remain after the app closes. Bulk Renamer is open-source under the MIT license and its free plan costs nothing, with no account required. The maker notes that an unsigned app may trigger standard Gatekeeper or SmartScreen warnings on first launch until code-signing is set up. Infinite Creation describes its free tools as serving people who create, validate, publish, and teach media.

Renamer.ai analyzes file contents with AI and OCR to create descriptive filenames. It handles more than 30 formats, including documents, spreadsheets, images, presentations, vector files, and email files. Users can rename batches, build templates from details such as document type, date, company or person names, invoice information, and project details, or set Magic Folders to rename files when they arrive. The service supports more than 20 languages and can detect a file's language automatically. Listed platforms include macOS, Windows, web, and API; desktop plans include batch renaming and Magic Folders. The free Starter plan allows 25 renames per month, while paid plans range from 200 files per month on Pro to 5,000 on Ultimate. Pro costs $9.95 a month. The web demo has a 100 MB maximum file size. Web uploads are stored on EU servers for up to 24 hours; files processed through the desktop app are not stored on the service's infrastructure. The company says data is encrypted in transit and at rest, and file contents are not used to train AI models.