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Step 1
Open [Bulk Image Resizer](/tools/bulk-image-resizer).
Guide
How to Batch Resize Images Online
Learn how to bulk resize JPG, PNG and WebP images online, preserve aspect ratio, choose dimensions, and process an image batch consistently.
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 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
Check the results and download each resized image individually 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.
Plan limits and download options
On the Free plan you can resize up to 3 images per run, with a 10 MB limit per input image. Pro supports up to 20 images per run, with the same tool-specific 10 MB per-file limit. Upload JPG, PNG or WebP files; GIF input is not supported. After processing, download individual resized images, or use the automatically generated ZIP when several output images are produced.
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.
When a batch resizer is not the right tool
Batch resizing scales images so they fit within a maximum width and height; it does not force every image into a square crop or invent extra pixels. If you need identical subject framing for product listings or team headshots, crop the originals before applying a shared resize limit. If you have an animated GIF, this workflow does not accept it. JPG, PNG and WebP images are supported, and resized outputs retain their input formats.
For website speed, resize oversized images first, then compare file size and appearance before deciding whether to use an additional compressor. A larger image file is not automatically a higher-quality visual.
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Ready to run this workflow?
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FAQ
Can I resize multiple images at once? ▼
Yes. The Bulk Image Resizer processes a batch of supported images with the same resize settings in one run.
Does bulk resizing preserve aspect ratio? ▼
When you set only one dimension, the other dimension is calculated proportionally so the original aspect ratio is preserved.
Which formats can I batch resize? ▼
The current bulk workflow accepts JPG, PNG, and WebP images.