Bulk File Renamer Online — Batch Rename Files

Turn IMG_4821.JPG, IMG_4822.JPG… into Beach Trip 001.jpg, Beach Trip 002.jpg in one go. Build your rules, check the live preview of every new name, then take the result.

Renaming rules

• Find & replace — plain text, or tick regular expression for patterns.
• New name — replace the whole name (combine with numbering for sequences).
• Prefix / suffix — e.g. add 2024-07 in front of every file.
• Numbering — start value, digits (001), separator, and whether numbers go at the start or end.
• Case — lowercase, UPPERCASE, Title Case, kebab-case or snake_case.
• Tidy-up — strip - Copy and (1) from duplicated files, and lowercase .JPG → .jpg.

Characters Windows doesn't allow in names (\ / : * ? " < > |) are replaced automatically, and clashing names get (2) added so nothing is overwritten.

Two ways to apply the names

1. Download renamed copies (.zip). Your browser zips copies of the files under their new names. Simple and safe, best for up to a few hundred MB.

2. Download a Windows rename script (.ps1). For big folders — videos, thousands of photos — copying is wasteful. The script renames the original files in place:

1. Save rename-files.ps1 into the same folder as the files.
2. Right-click it → Run with PowerShell.

If Windows blocks the script, run powershell -ExecutionPolicy Bypass -File .\rename-files.ps1 from that folder. Test on a copy of the folder first — renames by script can't be undone with Ctrl+Z.

Why can't a website rename my files directly?

Browsers are deliberately sandboxed: a web page can read files you hand it, but it can't change anything on your disk. That's good security, and it's why this tool offers copies or a script.

Renaming photos by the date they were taken

Numbering by selection order is fine for many jobs, but photos from several phones need sorting by capture time first. Bulk File Renamer for Windows renames photos and videos by date taken (from JPG, HEIC, MP4, MOV metadata), renames in place with a highlighted preview, and keeps a full history with Undo — even days later.