IREUMGYEOL
Rename files from a spreadsheet
Use a rule when names share a pattern. Use a spreadsheet when each file needs its own name.
1. Select a small batch first
Choose files or drop them onto the tool. Start with a few copies to check your naming convention. Each batch can contain up to 200 files, with a combined size of 100MB. Folders are not supported.
2. Choose a naming method
A shared rule
To turn notes into Project_001.txt, Project_002.txt, and so on, enter Project_ as the prefix, turn off “Keep original name”, and turn on sequential numbers. Start at 1 with 3 digits. File extensions are kept.
If the old names are useful, keep them and add a prefix or suffix instead. Find and replace uses plain text, not regular expressions, and is case-sensitive. The numbering follows the preview order; choose “Original filename” to sort names first.
A spreadsheet mapping
Put current filenames, including extensions, in the first column. Put the new names in the second. Copy both columns from Excel, Google Sheets, or another spreadsheet, then paste them into “Match a spreadsheet”.
| Current name | New name |
|---|---|
| IMG_2041.jpg | Product_front.jpg |
| IMG_2042.jpg | Product_side.jpg |
| Notes.txt | Meeting_notes.txt |
This is a synthetic example. Your spreadsheet order does not need to match your file selection order. Matching uses the current filename, ignoring case and Unicode composition. If two selected files share the same name, remove one before using a mapping.
Leave “First row contains column headers” checked if you copied the headings. Uncheck it if you copied only data rows. UTF-8 CSV and TSV files can also be imported; XLSX files must be opened and their two columns copied. Rename tables are limited to 1MB.
3. Review every result
Files missing from the table keep their names and show a warning. A new name without its original extension gets that extension appended. If you enter a different extension, it becomes part of the name; this tool does not convert file formats. For example, changing photo.jpg to “poster.png” produces poster.png.jpg.
You can edit a new name directly in the preview. Duplicate names, reserved system names such as CON, unsafe characters, and names longer than 240 UTF-8 bytes prevent saving. Changing a rule or method resets manual edits; switching the interface language does not.
4. Download and check the copies
Download the ZIP and extract it into a new folder. All selected files are included, including those with unchanged names. The tool preserves file contents but not directory structure, original modification dates, or permissions. The ZIP uses no compression.
The separate rename log records current and new names as CSV. Cells that could be interpreted as spreadsheet formulas are prefixed with an apostrophe. Review those cells before reusing the log as an input mapping.
When a desktop tool may fit better
For very large files, entire directory trees, or renaming originals in place, use your operating system or a trusted desktop renaming utility. Ireumgyeol is designed for small batches and leaves originals untouched.