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Batch Image Resizer

Resize many JPG, PNG or WebP photos to a maximum width or height, or an exact box, then download them as one ZIP.

Choose images to resize

Every resize runs in this tab. Nothing is uploaded.

Results

Choose images, set a max width or height, then resize.

Per-file results and a ZIP download appear here.

Your file is never sent to a server. It is read and processed by your own browser, and the results are not stored.

How to use it

  1. Choose up to 50 images. Each one is checked from its bytes before conversion.
  2. Enter a max width, a max height, or both. Keep the aspect lock for natural proportions.
  3. Pick an output format, then resize and download the ZIP.

Limits worth knowing

  • At most 50 files per run, 25 MB each.
  • The aspect lock scales each image to fit inside the box; it does not crop or pad.
  • JPEG output flattens transparency onto the background colour. PNG keeps it.
  • Blank width or height keeps the original dimension. Images are never enlarged.

Why batch resizing exists

A folder of photos heading to a website or an email often needs one size, not fifty. This tool scales each image inside the box you set, preserves its proportions, and packs the results into one ZIP.

Unlocking the aspect lock forces every image to the exact box, which is useful for avatars and thumbnails that must be the same size, but it can distort wide or tall photos.

Formats and transparency

WebP is the default because it is smaller than JPEG at similar quality and keeps transparency. PNG is lossless and keeps transparency exactly. JPEG is the most compatible but flattens transparency onto the colour you choose.

The tool re-encodes every image, so the output bytes are not the same as the input bytes. At high quality the difference is usually invisible.

Frequently asked questions

Does Batch Image Resizer upload my files to any server?

No. Batch Image Resizer runs in your browser, and the file is read there rather than sent to a server for processing. Our host still sees ordinary page-request metadata, which is described on the privacy page.

Is Batch Image Resizer free to use?

Yes, Batch Image Resizer is free, with no paid tier, no account, and no watermark added to your output. The limits are technical rather than commercial: file size, page count and supported formats are listed on this page.

What file formats and sizes are supported?

Batch Image Resizer supports .jpg, .jpeg, .png, .webp files up to 25MB directly in your browser.

Can I force exact dimensions?

Yes. Unlock the aspect-ratio lock and enter both a width and a height. The images are stretched to the exact box, which can distort them, so keep the lock on for natural proportions.

Does aspect ratio stay locked by default?

Yes. With the lock on, each image is scaled to fit inside the box you set, preserving its original proportions. Neither side exceeds the value you typed.

How many images can I resize?

Up to 50 images per run, 25 MB each. The tool reads headers first, converts sequentially, and packs the successes into one ZIP.