SmartBatchRenamer runs on macOS, Windows, and Linux. It reads file contents to detect the real format instead of trusting the filename. It warns about wrong or missing extensions without blocking the task, corrects them in one click, and saves batch rename rules for reuse.
File contents, names, and paths stay on your device
Key Feature · File Extension
Most rename tools only edit text. SmartBatchRenamer also inspects each source file's contents, finds wrong or missing extensions, and makes the correction part of the batch rename workflow.
Inspect file signatures and internal structure to identify the real format. If the content is unknown, fall back safely to the source extension in lowercase instead of guessing.
Look inside formats that use the same ZIP container and tell DOCX, XLSX, PPTX, APK, EPUB, and JAR apart instead of labeling every one as ZIP.
Check every file, even when no other rule renames it. Warnings never block the task; after confirmation, the correction rule always runs after all active rename rules.
Extension correction examples
annual-report.zip annual-report.docx Content is actually a Word document
travel-photo travel-photo.jpg Missing JPEG extension detected
For truly equivalent spellings, you stay in control: choose jpg / jpeg / jpe, tif / tiff, or db / db3 / sqlite / sqlite3.
Features
Identify the real format from file contents, flag wrong or missing extensions, and correct them as part of a batch rename.
Create a complete rename rule from insert, replace, and delete operations plus date, incrementing sequence, and random sequence parameters. Apply the same rule again when similar tasks come up.
Preview every new filename before applying a batch rename. Step-by-step changes make it clear exactly what each operation changes.
Automatically detect duplicate names inside the batch and same-name files in the target directory before anything changes.
Undo an executed batch rename with one click and restore every file's original name when a rule needs adjustment.
Add date/time values, incrementing sequence numbers, and random sequences once, then reuse them across complex filename rules.
Showcase
Add files by dragging them straight into the window. The file list shows original names, new names, and results, with sortable columns for large batches.
As you add search-and-replace, delete, insert, numbering, or date operations to a rule, watch each filename transform step by step. Reuse the finished rule in later batches.
A carefully designed dark mode follows your system theme automatically, keeping long photo, document, and media file cleanup sessions comfortable.
Use Cases
Batch rename camera photos from Canon, Nikon, Sony, and other common filename formats by date or sequence number
Rename iPhone and Android photo files in batches so albums follow a clean timeline
Apply consistent filename rules to contracts, reports, invoices, and other document batches
Standardize music and video filenames in batches to keep large media libraries organized
FAQ