How to Bulk Resize Multiple Images at Once

Resizing images one at a time is painful. Here's how to resize a whole batch of images to the same dimensions in a single step — no software required.

When You Need Bulk Resizing

Preparing product photos for an e-commerce store
Resizing all images in a folder to the same width for a website
Standardizing photo dimensions for a presentation or document
Reducing file sizes before uploading to a gallery or cloud storage
Preparing thumbnails from a large set of originals

How to Bulk Resize Images Online (No Software)

1.Go to ImageResizer.org/bulk-resize.
2.Upload multiple images by dragging them all onto the uploader, or click Browse and select multiple files.
3.Enter your target width and height in pixels.
4.Enable "Keep aspect ratio" to avoid stretching (recommended).
5.Click "Resize All" and download each image individually.

Free: up to 5 images per batch. Pro plan: up to 20 images per batch.

Try it now — free

Resize up to 5 images at once. No signup needed.

Bulk Resize Free →

Tips for Consistent Results

Keep aspect ratio ON — otherwise images with different original ratios will be stretched or squished.
Set only width or only height — if you only care about one dimension (e.g., all images 1200px wide), set just that one and leave the other blank.
Start with originals — bulk resizing works best when all source images are already larger than the target size.
Use consistent naming — download and rename files consistently for easy organization.

Alternatives for Very Large Batches

For 50–1000+ images at a time, consider these desktop options:

IrfanView (Windows, Free)

File → Batch Conversion → select "Resize" action → process hundreds of images at once.

Preview (Mac, Built-in)

Select all images in Finder → Open in Preview → Tools → Adjust Size → Export All.

ImageMagick (Command Line, Free)

mogrify -resize 1200x '*.jpg' — resizes all JPGs in a folder to 1200px wide.

Frequently Asked Questions

How many images can I bulk resize at once?

Free users can resize up to 5 images per batch. Pro users can resize up to 20 images per batch.

Will all images be resized to exactly the same dimensions?

Yes — all uploaded images are resized to the same target dimensions. With 'Keep aspect ratio' enabled, each image is scaled proportionally without distortion.

What is the best way to resize 100+ images quickly?

For large batches, desktop tools like IrfanView (Windows) or ImageMagick (command line) are faster. For up to 20 at a time, our bulk tool works without any setup.