Bulker
Bulker is a free bulk file renamer for Linux, macOS, and Windows.
What Bulker is
Bulker is a free bulk file renamer for Linux, macOS, and Windows. In its graphical interface, users enter text to find in filenames and replacement text, then run a bulk rename. Files and directories can be added by drag and drop; directory contents, including files in nested directories, are included recursively. Optional include and exclude masks use regular expressions to filter files in the rename process. Bulker also runs from the command line with search text, replacement text, and one or more file or directory paths. Directory inputs are checked recursively, and each command-line run accepts only one search value and one replacement value. The README says to run the app using Java 21 and links to an all-in-one JAR; the latest release listed is version 1.4.0. The repository lists an Apache-2.0 license. Bulker supports regex renaming, but not metadata-based renaming, rename preview, folder renaming, or undo.
Good
- Free for Linux, macOS, and Windows.
- GUI and command-line rename workflows.
- Directory inputs include nested files recursively.
- Regular-expression masks can filter files.
- Repository lists an Apache-2.0 license.
Watch out
- Requires Java 21.
- CLI accepts one search and replacement value per run.
- No rename preview or undo.
- No metadata-based or folder renaming.
Who it suits
Bulker suits users who want to replace filename text across files or recursively included directories on Linux, macOS, or Windows. It offers both a GUI and command-line workflow, but does not provide preview or undo.
Verdict
Bulker covers text replacement across files and recursive directory inputs, with both GUI and command-line options. Its lack of preview and undo makes it important to check the intended rename inputs before running a batch.
The facts
Each one read from Bulker's own pages, with the date it was checked.
What it does
- CLI limitation
- The CLI accepts only one search value and one replacement value per run.checked 9 Oct 2026
- Command line
- Bulker can also run from the command line with search, replacement, and input arguments.checked 9 Oct 2026
- Download
- The README directs users to download the latest all-in-one JAR from GitHub Releases.checked 9 Oct 2026
- Filtering
- Optional include and exclude masks use regular expressions to filter files in the rename process.checked 8 Oct 2026
- Filters
- Optional include and exclude masks use regular expressions to filter files for renaming.checked 9 Oct 2026
- GUI
- The GUI lets users enter search and replacement text and run a bulk rename.checked 9 Oct 2026
- GUI workflow
- The GUI lets users search filenames for text, replace it, and run a bulk rename.checked 8 Oct 2026
- Input paths
- The CLI accepts file or directory paths and allows multiple input arguments.checked 9 Oct 2026
- Integrations
- The README describes drag-and-drop input for files and directories and credits a Java Swing drag-and-drop list implementation.checked 8 Oct 2026
- License
- The repository identifies its license as Apache-2.0.checked 9 Oct 2026
- Multiple inputs
- The command line accepts multiple input paths, and directory inputs are checked recursively.checked 8 Oct 2026
- Purpose
- Bulker is described as a bulk file renamer.checked 9 Oct 2026
- Recursive folders
- Bulker adds files from directories recursively, including files in contained directories.checked 8 Oct 2026
- Recursive input
- Files in dropped directories are added recursively, including files in contained directories.checked 9 Oct 2026
- Release
- The latest release page opened identifies version 1.4.0 and is titled “Allow basic regex-search in GUI.”checked 9 Oct 2026
- Runtime
- The release instructions say to run Bulker using Java 21.checked 9 Oct 2026
The company
- Maker
- The GitHub profile describes Griefed as a Minecraft modpack maker and Raspberry Pi and Docker enthusiast.checked 9 Oct 2026
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