Bulk Image Resizer

What is the Bulk Image Resizer?

The Bulk Image Resizer applies one size setting to a whole batch of images and hands back a single zip. Drop in twenty product photos, set a maximum width of 1600 pixels, pick JPEG or WebP, and every file comes out consistent. It runs in your browser: nothing is uploaded, there is no queue, and no per-file limit.

How to use it

1. Drag a folder of images onto the drop zone, or click to select several files.
2. Choose how to resize: by width, by height, by longest side, or by percentage. The aspect ratio is kept.
3. Pick the output format and quality. Keep original if you only want dimensions changed.
4. Click Resize All. A progress bar shows each file being processed.
5. Download the zip, or download individual files from the list.

Features

• Batch processing with one setting for every file.
• Resize by width, height, longest side or percent, always keeping proportions.
• Format switch to JPEG, PNG or WebP with a quality slider.
• Zip download so the result drops straight into a CMS uploader.
• Private: files never leave your device.

Fit, fill or pad?

Resizing by width or height changes both dimensions proportionally, so a set of photos with different shapes will come out with different heights. That is what you want for a blog or a gallery. If you need identical rectangles (a product grid, a set of thumbnails), you have three options: crop to fill, pad with a background colour, or fit inside a box and accept the varying shape. Which to choose, and the sizes each platform expects, is covered in how to bulk resize images consistently: fit, fill or pad, and settings for every job.

Sensible settings

• Blog and content images: longest side 1600 to 2000 px, WebP at 80.
• Product images for a marketplace: 2000 px square if the platform zooms; JPEG at 90 on white.
• Email and documents: longest side 1200 px, JPEG at 80.
• Thumbnails: 400 to 600 px, then run through the compressor.

Related tools

Reduce file size without changing dimensions with the Bulk Image Compressor, resize a single image with more control in the Image Resizer, or convert formats one at a time with the Image Converter.

Frequently asked questions

How many images can I process?

There is no fixed cap. Memory is the practical limit; batches of a hundred web-size images are fine on a laptop, and phones manage a few dozen.

Will it enlarge small images?

Only if you ask it to. By default images smaller than the target are left at their original size, because upscaling reduces quality.

Are my photos uploaded?

No. Everything runs in the browser.

Is EXIF data kept?

No; re-encoding strips it, which also removes GPS location from phone photos.