How do I resize multiple images at once?

Drop all your images onto the upload zone at once (or click to browse), choose a maximum width or percentage and an output format, then click Resize all & download ZIP. Each image is resized in your browser and packed into one ZIP. It is completely free and your images are never uploaded.

Are images uploaded to a server?

No. Every image is resized and zipped entirely in your browser; nothing leaves your device. This is the core design principle of the tool.

How many images can I resize at once?

Up to 100 images per batch. Very large batches or very large images take longer because all the work happens on your device.

What does "max width" do?

It shrinks any image wider than your value down to that width (keeping the aspect ratio) and leaves smaller images untouched. Percentage mode scales every image by the same factor.

What formats can I output?

JPEG, PNG, or WebP. All resized images in a batch use the format you choose, and they are delivered together in a single ZIP file.

Is batch-resizing images free?

Yes — bulk-resizing a whole folder of images and downloading them as a ZIP is completely free, forever. No account, no sign-up, and no cap on the number of images you process per batch. All resizing and ZIP-packing happens in your browser; your images are never sent to any server. The site is ad-supported.

Does it work offline?

Yes. Resizing and zipping run in the browser, so after the page loads it works offline.

Bulk Image Resizer

Bulk Image Resizer is a free browser-based tool that resizes many images at once and downloads them as a single ZIP. Choose a maximum width or a percentage and an output format; every image is resized on your device with no upload, and it works offline.

Resize a whole batch of images at once and get them back as a ZIP — free, no upload required.

100% Free — Forever. No fees, ever.
Private: files are processed locally in your browser and never sent to a server.
No upload, no account, no sign-up.

How do I resize multiple images at once?: Drop all your images onto the upload zone at once (or click to browse), choose a maximum width or percentage and an output format, then click Resize all & download ZIP. Each image is resized in your browser and packed into one ZIP. It is completely free and your images are never uploaded.
Are images uploaded to a server?: No. Every image is resized and zipped entirely in your browser; nothing leaves your device. This is the core design principle of the tool.
How many images can I resize at once?: Up to 100 images per batch. Very large batches or very large images take longer because all the work happens on your device.
What does "max width" do?: It shrinks any image wider than your value down to that width (keeping the aspect ratio) and leaves smaller images untouched. Percentage mode scales every image by the same factor.
What formats can I output?: JPEG, PNG, or WebP. All resized images in a batch use the format you choose, and they are delivered together in a single ZIP file.
Is batch-resizing images free?: Yes — bulk-resizing a whole folder of images and downloading them as a ZIP is completely free, forever. No account, no sign-up, and no cap on the number of images you process per batch. All resizing and ZIP-packing happens in your browser; your images are never sent to any server. The site is ad-supported.
Does it work offline?: Yes. Resizing and zipping run in the browser, so after the page loads it works offline.

Resizing in a batch keeps the aspect ratio of each image, so nothing is stretched or squashed.
The ZIP is built in the browser with fflate, a small pure-JavaScript compression library, so no server is involved.
"Max width" only shrinks images larger than the target and leaves smaller ones unchanged, avoiding upscaling blur.
WebP usually produces the smallest files of the three output formats at a similar visual quality.
Because every step is client-side, none of the images are transmitted, keeping a whole folder of photos private.

🗂️ Bulk Image Resizer

Bulk Image Resizer