About Bulk Image Renamer
Rename hundreds of photos at once with a consistent pattern. Drop in a folder of holiday snaps, give them a prefix like "vacation-2026-", set the zero-padding to three digits, and out come vacation-2026-001-img_4523.jpg, vacation-2026-002-img_4524.jpg, and so on. The tool lets you preview every renamed file before downloading, choose between keeping the original basename or replacing it entirely, and bundles the result as a ZIP. The files themselves are never modified — only their names — so EXIF, capture dates and pixel data are all preserved.
- No uploads
- Browser-only
- Works offline
- 100% free
How it works
- 1
Drop your images
Drag in any number of files. Bulk renaming works on any image format SnapToolz can read.
- 2
Configure the pattern
Set a prefix, suffix, starting index and zero-padding width. Every change updates the live preview.
- 3
Download as ZIP
Click Download. Files are repackaged with their new names; the originals on your disk are untouched.
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Frequently asked questions
Are my files uploaded to a server?
No. Every tool on SnapToolz runs entirely inside your browser using JavaScript and WebAssembly. Your file is read locally, processed in memory, and the result is offered as a download. Nothing is sent to a server — there isn't one to send to.
Does this modify my original files?
No. Files are read into the browser, repackaged into a ZIP under their new names, and the ZIP downloads. Your originals on disk are never modified.
What happens if two files would end up with the same name?
Collisions are auto-resolved by appending -2, -3 etc. so every output filename is unique.
Can I rename non-image files too?
Yes — there's no image-specific check. The tool is image-themed because that's the most common use, but you can drop in any files. For a more general renamer with full slug cleanup, try the Filename Cleaner.
Does it work offline?
Yes. SnapToolz is a Progressive Web App. After your first visit, the app is cached on your device and every tool keeps working without an internet connection.
Is SnapToolz free?
Yes — every tool is 100% free with no sign-up, no watermark, no hidden tier. The whole platform is open source and we have no plan to gate features.