Bulker
Bulker: A free open-source renamer for command-line bulk text replacement. Ranked #29 of 31 in File Renaming Software by our editors (5.3/10); pricing: Free plan; best for command-line bulk text replacement.
At a glance
- Editor score5.3 / 10
- PricingFree plan
- Best forCommand-line bulk text replacement
- Free planYes
- Paid fromFree
- Regex renamingYes
- Facts checked22 Sep 2026
Where it wins
- Combines graphical and command-line filename replacement
- Processes files recursively within directories
- Supports regex include and exclude masks for filtering
Where it doesn't
- No documented rename preview
- No documented undo support
- Requires Java 21
Our verdict on Bulker
Bulker is an open-source utility for replacing text in filenames across batches of files. It is distributed as an executable Java archive and offers both a graphical interface and command-line operation. Individuals and small teams can use drag-and-drop input for files or directories, or provide multiple command-line paths when a repeatable workflow is more suitable. Recursive processing extends operations into directory contents.
Bulker’s pricing is straightforward: it is open-source and has a free plan. The published feature set focuses on filename text replacement rather than metadata-based renaming. Regular-expression include masks and exclude masks let users filter which files participate in an operation, while multiple command-line input paths support more flexible batch jobs. This combination makes the product particularly relevant for users who prefer command-line control but still want a graphical option for direct file and directory input.
The main trade-off is a narrower workflow around applying rename operations. Rename preview, undo support, folder renaming, and metadata-based renaming are not part of the documented category specifications, so users who need review-before-apply safeguards, recovery tools, or richer file-organization rules should choose another renaming tool. Bulker is a sensible fit for straightforward filename replacement, recursive processing, and regex-based filtering, especially when a free open-source utility with GUI and CLI modes meets the need. It is less suitable for workflows centered on metadata, folder names, or reversible batch changes.
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Bulker pricing
Bulker fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Platform coverage | Not verified |
| Regex renaming | Yes |
| Metadata-based renaming | No |
| Rename preview | No |
| Folder renaming | No |
| Undo changes | No |
| Deployment | Desktop |
| Support | Community, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 22 Sep 2026 |
Alternatives to Bulker
- KRenameA capable free Linux renamer for expressions, metadata, folders, and undo.9.0
- Bulk Rename UtilityA feature-rich Windows renamer for precise batch operations, scripting, and metadata rules.8.9
- Name ManglerA focused Mac renamer with advanced rules, previews, reversal, and Dropbox or Box support.8.4
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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