Batch Image Processor
Compress, convert or resize many images at once and download them all as a single ZIP — privately in your browser.
How to batch processor in 3 steps
- 1
Add your images
Drop a batch of photos into the box — there's no fixed limit since everything runs locally.
- 2
Choose an operation
Pick compress, convert (WebP/JPG/PNG) or resize, then set the quality, format or width.
- 3
Process & download ZIP
Run the batch and download every result in a single ZIP file — nothing was uploaded.
Why use Kotopig?
Your files stay private
Images are processed on your device and never uploaded to any server.
Instant results
No upload or download queue — processing starts the moment you drop a file.
Free, no sign-up
No account, no watermarks on output, no per-day limits. Just open and use.
Frequently asked questions
Are my images uploaded to a server?
No. Every operation runs entirely inside your browser using your device's own processor. Your files never leave your computer, so the tool works even with the page disconnected from the internet after loading.
How many images can I process at once?
There's no hard limit. Because the work happens on your own device, you're only bound by your computer's memory — hundreds of images at a time is fine.
What can the batch processor do?
Three operations: compress (reduce file size at a chosen quality), convert (change every image to WebP, JPG or PNG) and resize (cap each image to a maximum width, keeping the aspect ratio).
How are the results delivered?
All processed images are bundled into one ZIP file that downloads in a single click. Filenames are kept and de-duplicated automatically.
Is the ZIP created on a server?
No. The ZIP is assembled in your browser from the locally processed images, so your files never leave your device at any point.