How to Batch Resize Images Online

Introduction

Resizing one image is easy. Resizing a folder of product photos, screenshots, headshots, or website assets one by one is where the work becomes repetitive. A bulk image resizer applies one resize rule to a whole batch so the output stays consistent.

CodeStorms Bulk Image Resizer accepts JPG, PNG, and WebP images and lets you set a maximum width, height, or both. When you provide only one dimension, the tool preserves the original aspect ratio automatically.

Step-by-step guide

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Step 1

Open [Bulk Image Resizer](/tools/bulk-image-resizer).

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Step 2

Add the JPG, PNG, or WebP images you want to process.

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Step 3

Set the target width, height, or both.

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Step 4

Review the selected files and dimensions.

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Step 5

Run the resize job.

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Step 6

Download the resized results when processing finishes.

Benefits

✓ prepare product photos before a CMS or marketplace upload;
✓ reduce oversized camera images before publishing them on a website;
✓ standardize team headshots or profile images;
✓ resize multiple client assets to the same maximum width;
✓ prepare a group of screenshots for documentation or a support portal.
✓ Keep the original files before processing a large batch.

Best practices

• Keep the original files before processing a large batch.
• Use the same target dimension for assets that belong to the same layout.
• Do not enlarge small images unless you have a specific reason; upscaling does not create missing detail.
• Check a few outputs at full size before replacing production assets.
• For product catalogs, use consistent source framing before resizing.

If the images also need consistent framing, crop them before resizing. The image cropping guide explains how to choose the area and aspect ratio to keep; then use Crop Image before applying one resize rule to the full batch.

More details

When bulk resizing is useful

Batch resizing is a good fit when you need to:

prepare product photos before a CMS or marketplace upload;
reduce oversized camera images before publishing them on a website;
standardize team headshots or profile images;
resize multiple client assets to the same maximum width;
prepare a group of screenshots for documentation or a support portal.

If you only have one file, use Resize Image. For a folder or batch, open Bulk Image Resizer.

Width, height, and aspect ratio

For most website work, setting only a maximum width is the safest option. For example, if a 4000 × 3000 photo only needs to display at 1200 pixels wide, set the width to 1200 and let the height scale proportionally.

Setting both width and height is useful when your destination expects a fixed bounding box. Review the result if source images have different aspect ratios because forcing two dimensions can change how the final image fits the layout.

Bulk image resizer vs image compressor

Resizing changes pixel dimensions. Compression reduces file size. They solve different problems.

A practical web workflow is:

bulk resize oversized images;
review dimensions;
compress the resized files if they are still heavier than needed.

Use Image Compressor after resizing when page weight matters.

Common search terms that mean the same task

People describe this workflow in different ways: bulk image resizer, batch image resizer, bulk resize images, batch resize photos, or resize multiple images. In each case, the goal is the same: apply consistent dimensions to several images without editing every file separately.