Bulk Image Resizer

How to use the Bulk Image Resizer

1. Drop a batch of images onto the panel. Product photos, event shots or a folder of screenshots all work.
2. Set the target width or height and, if you like, a different output format and a quality level for compression.
3. Process the batch and download the resized files.

When to use it

Marketplaces and shop platforms want product images at a consistent size, and a 6 MB photo straight off a phone makes a web page slow. Resizing thirty photos one at a time in an editor is an afternoon; doing it here is a minute. The same applies to preparing images for a newsletter, a listing site or a slide deck.

How the three resize modes differ

Fit inside keeps the image's proportions and scales it so both sides are within the target, so a 4:3 photo resized to 1000 × 1000 comes out 1000 × 750. Pad to exact size does the same scale and then adds white borders to reach the exact target, which is what marketplaces that demand square images want. Stretch forces the exact size without preserving proportions and distorts anything that is not already the right shape. Output can be JPEG (smallest, no transparency), PNG (lossless, keeps transparency, larger) or WebP (small and modern, not accepted everywhere). Everything is processed in the browser; the files never leave your device.

Worked example

Thirty product photos from a phone, each around 4000 × 3000 pixels and 5 MB. Target: 1200 wide, Fit inside, JPEG. Each comes out 1200 × 900 at roughly 150–250 KB, and the batch downloads together. For the marketplace that insists on 1000 × 1000 squares, run the same batch again with Pad to exact size: the photo is centred with white bands top and bottom, and nothing is cropped. Thirty images, two runs, a few minutes; in an editor, one at a time, an afternoon.

Common mistakes

• Stretch when you meant Pad. A 4:3 photo stretched to a square makes the product look wrong; use Pad or crop the source first.
• Upscaling. Setting a target larger than the source adds pixels but not detail; the result is soft.
• JPEG for logos and screenshots. Flat colour and text go blurry in JPEG; use PNG. Photos go the other way: PNG makes them huge.
• Resizing the only copy. Keep the originals; a 1200-pixel image cannot be turned back into a 4000-pixel one.

When this tool is the wrong one

It resizes and converts; it does not crop, rotate, retouch or remove backgrounds. For a format change with no resize, the Image Format Converter is quicker. For preparing a YouTube thumbnail and checking what the interface will cover, the Thumbnail Safe Zone Preview.

Good to know

All processing runs in your browser, so nothing is uploaded and there is no queue; very large batches simply take longer on slower devices. Keep the originals. Resizing down is safe, but enlarging a small image cannot add detail it never had.