Does it upscale images?

No. The max width and height are upper bounds — images larger than the box are scaled down; images smaller than the box are left untouched to avoid blur.

How are output files named?

Each file uses the original base name plus the new dimensions, e.g. photo-1920x1080.jpg. The ZIP keeps them all together with no name collisions across folders.

Is there a file count limit?

No hard limit — your device memory is the bound. A few hundred images at typical resolutions works comfortably; very large batches may take a few seconds.

Downloading dozens of individual files is painful. A single ZIP keeps everything together and is faster for the browser to write than triggering N downloads.

Are my images uploaded?

No. Resizing happens entirely in your browser using the Canvas API. The ZIP is generated client-side with JSZip. Nothing leaves your device.

Bulk Image Resizer

Resize a batch of images to a max box and download them all as a ZIP.

100% private — no uploads Image ToolsFree & unlimited Read tutorial

See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use Bulk Image Resizer

Follow these steps — everything happens instantly in your browser.

1
Step 1. Drop multiple images onto the zone — PNG, JPG, WebP, GIF and BMP are supported.
2
Step 2. Set a maximum width and height in pixels — each image scales to fit, never stretched.
3
Step 3. Pick an output format (JPEG / WebP / PNG) and quality, optionally toggle aspect-ratio lock.
4
Step 4. Click Resize — every image is processed locally with the Canvas API and bundled into a ZIP via JSZip.
5
Step 5. Unzip the result to access all resized images, named with their new dimensions.