KokoroFlow · File tool
Batch File Renamer
Select a batch of files, choose a renaming rule, preview every new name, then download them all at once as a ZIP. Nothing is uploaded — renaming happens entirely in your browser.
Select files to rename
Click to select files, or drag and drop them here
Choose a renaming rule
No files selected yet. Choose a batch of files above to preview the renamed results.
Frequently asked questions
Does this actually rename the files on my computer?
Not directly — for security reasons, browsers can't modify files sitting on your hard drive. Instead, this tool creates copies with the new names inside a downloadable ZIP, which you can then extract to replace or supplement your originals.
What happens if two files end up with the same new name?
The preview table lets you check every result before downloading. If a rule like find-and-replace produces a collision, you'll see two identical names in the preview — try adjusting the rule, or switch to sequential numbering, which never produces duplicates.
Does sequential numbering keep the original file extensions?
Yes — only the name portion is replaced with the base name and number; each file's original extension (.jpg, .pdf, .docx, etc.) is preserved automatically.