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Bulk Image Resizer - Resize Multiple Images at Once

Resize dozens of images at once. Set exact dimensions or scale by percentage, choose output format, and download individually or as a ZIP. 100% browser-based, no upload.

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JPG, PNG, WebP, GIF, BMP - select as many as you need

Free Bulk Image Resizer - Resize Multiple Images at Once

Our free bulk image resizer lets you resize dozens of images at once - right in your browser. Upload as many JPG, PNG, WebP, GIF, or BMP files as you need, set your target dimensions or scale percentage, and download every resized image individually or as a single ZIP archive.

Unlike most batch image resize tools, this one processes images sequentially with a live progress bar - so your browser stays fast and responsive even when resizing hundreds of photos. Your images are never uploaded to any server. Everything runs locally on your device, making it completely private and secure.

When Lock aspect ratio is enabled, each image is scaled proportionally based on its own original dimensions. A landscape photo and a portrait photo will both be resized correctly - no stretching, no distortion. You can also choose the output format (JPG, PNG, or WebP) and adjust the quality level for JPG and WebP outputs.

How to Resize Multiple Images at Once

  1. Upload your images

    Click "Select Images" or drag multiple image files onto the upload area. You can add more files later with the "+ Add More" button.

  2. Set resize options

    Choose Pixels mode to set an exact width and height, or Percentage mode to scale all images by a percentage. Enable "Lock aspect ratio" to prevent distortion.

  3. Choose output format

    Select JPG for smaller files, PNG for lossless quality, or WebP for the best compression. Adjust the quality slider for JPG and WebP.

  4. Click Resize All Images

    A progress bar shows each image being processed. Images are handled one at a time to keep your browser responsive.

  5. Download your results

    Download each image individually, or click "Download All as ZIP" to get everything in one archive.

Common Use Cases

Web optimization

Resize a folder of product photos or blog images to a consistent size before uploading to your website or CMS.

Social media batches

Prepare multiple images for Instagram, Twitter, or LinkedIn posts - all at the correct dimensions in one go.

Email campaigns

Resize a set of promotional images to fit your email template width without manually editing each one.

Photo archiving

Downscale a large collection of high-resolution photos to save storage space while keeping them viewable.

Frequently Asked Questions

How many images can I resize at once?

There is no hard limit. The tool processes images one at a time in sequence to keep your browser responsive, so you can safely add dozens or even hundreds of images. Very large images (over 20 megapixels) may take a moment each.

What image formats are supported?

You can upload JPG, PNG, WebP, GIF, and BMP files - any format your browser can display. You can output as JPG, PNG, or WebP regardless of the input format.

Will all images be resized to the same dimensions?

Yes, all images use the same resize settings. If "Lock aspect ratio" is enabled, each image is scaled proportionally based on its own original dimensions - so a landscape and a portrait image will both be resized correctly without distortion.

Are my images uploaded to a server?

No. All processing happens locally in your browser using the HTML5 Canvas API. Your images never leave your device. The tool works entirely offline once the page has loaded.

How does the ZIP download work?

After all images are processed, click "Download All as ZIP" to package every resized image into a single ZIP archive. The archive is generated in your browser - no server involved.

What is the difference between this and the single Image Resizer?

The single Image Resizer is designed for one image at a time with a live preview. The Bulk Image Resizer is optimized for processing many images at once with a progress bar, batch download, and sequential processing to keep your browser fast.

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