Bulk Image Resizer

Bulk or Batch, It Is the Same Job

Bulk image resizer, batch image resizer, batch photo resizer, bulk JPG resizer, mass picture resizer. All the same request: one setting, a folder of images, one download. That is what this page does.

Resize many images at once

Drop in a whole batch and ResizePad resizes every image with the same setting, then hands you a ZIP. It is built for the times you have twenty product photos, a folder of screenshots, or a set of listing images that all need to be the same size.

Everything runs in your browser. The images are never uploaded, so a batch of forty photos is as private as one, and there is no queue and no watermark.

How it works

1. Pick how to resize in the settings at the top: by exact size, by percent, by a social or passport preset, or to a target file size in KB. Whatever you choose applies to every image.
2. Drop your images in, or click to select them. You can add up to 40 at a time.
3. Hit Resize all. You will see each image update with its new dimensions and file size.
4. Download all as a ZIP, or grab any single image from its row.

One setting, every image

When you resize by size with "lock aspect ratio" on, each image fits inside your box while keeping its own shape, so a mix of portrait and landscape photos all come out at a sensible size without stretching. Presets and target-KB work the same way: the rule is shared, the result is tailored to each image.

Need just one image, or want to fine tune with a live preview? Use the single-image resizer or crop tool. For a specific platform, the size guide lists them all.

File types and output format

You can drop in JPG, PNG, WebP, or GIF, and mix formats freely in the same batch. On the way out, though, the whole batch shares one output format, which you pick in the settings: JPG, PNG, or WebP. It defaults to JPG.

That matters in one specific case. If your batch contains PNGs with transparent backgrounds and you leave the output on JPG, the transparency gets flattened to a solid color, because JPG cannot store transparency at all. There is a color picker next to the format buttons for choosing what that color should be, and it defaults to white. If you need the transparency kept, set the output format to PNG or WebP before you resize.

In target-KB mode the choice narrows to JPG and WebP. PNG is lossless, so there is no quality dial to turn to land on a specific file size, which makes a KB target impossible to hit reliably.

There is no fixed file-size cap since nothing uploads, but very large photos (high-megapixel phone shots, big scans) use more of your device's memory, so the practical ceiling depends on your browser and how much RAM is free at the time.

Works on desktop and mobile browsers alike. On a phone, pick images the same way you would attach a photo to a text, then resize and download the ZIP straight to your device.

Batch resizing by format

The tool does not care what you feed it, but a few format-specific jobs come up often enough to spell out:

• Bulk JPG resizer. The default path. Photos in, smaller photos out, quality slider available if you want to trade sharpness for size.
• Bulk PNG resizer. Set the output format to PNG to keep transparency through the batch. Expect larger files than JPG, since PNG does not throw anything away.
• Bulk WebP conversion. Set output to WebP to convert a whole folder at once. WebP typically lands 25 to 35 percent smaller than JPG at comparable quality, which is why it is the usual choice for site images.
• Mixed batches. A folder of JPGs and PNGs together is fine. Just be deliberate about the single output format, per the transparency note above.

What people actually use this for

• Product photos for a shop. Marketplaces reject images over a size cap or above certain dimensions. Set one preset, run the batch, upload.
• Screenshots for documentation. Screenshots come off a retina display far larger than they need to be. A percent resize at 50% usually fixes an entire folder at once.
• Property listing photos. Listing portals cap both dimensions and file size. Target-KB mode is the direct answer here, since it hits the cap rather than guessing at it.
• Photos for email or a form. Attachment limits are about total size, so target-KB across the batch is the reliable route. The resize to 100KB and resize to 500KB pages cover the common caps, and 20KB and 50KB cover the strict government-form limits.
• A social batch. If every image is going to the same place, use a preset: Instagram, Facebook, YouTube thumbnail, Twitter header, LinkedIn banner.
• Passport or visa photos for a family. The passport photo preset holds the exact ratio, and running it as a batch does everyone at once.

Why not a desktop program

Most bulk resize advice points at Photoshop, IrfanView, XnConvert, or an ImageMagick command. Those are all fine, and if you resize images every day a desktop tool with saved profiles will beat a web page.

For an occasional batch they are overkill. There is nothing to install here, it runs offline once the page has loaded, and because the work happens in your browser the images never leave your device, which is the part that actually matters when the batch is client work or family photos.

The trade-off is honest: 40 images per batch, and a very large batch of very large files will lean on your device's memory. Run it in two passes if you hit that.

For a step-by-step version of this with screenshots, see how to resize multiple images at once. To keep quality through a resize, how to resize an image without losing quality covers what to watch.