Image Resizer

Resize one image or a whole batch

Choose JPG, PNG, or WebP files. Set exact pixel dimensions or enter a percentage. Keep the aspect ratio locked to avoid stretching, leave Do not enlarge checked when you only want smaller output, then choose an output format and quality. One result downloads directly; multiple results are packaged in a ZIP.

Pixels, percentages, and aspect ratio

Pixel dimensions give a precise final width and height. Percentage scaling applies independently to every selected image: 50% halves each image’s width and height and reduces its total pixel count to one quarter. Aspect lock keeps width and height in the same proportion as the source. Turning it off permits any dimensions, but people and circular objects can look squeezed or stretched.

How the resize is produced

The browser decodes the image, applies its stored orientation, and resamples it with a locally stored image-scaling library. The resized pixels are then encoded as JPEG, PNG, or WebP using local codecs. Nothing is sent to a remote resizing service. Batch jobs use the same settings for every selected file and preserve each base filename in the output.

Worked example

A 4000 × 3000 photo is 12 megapixels. Enter 2000 × 1500, or choose 50%, with aspect lock enabled. The result is 3 megapixels and remains 4:3. If JPEG quality is 82, the file will usually be much smaller than the source, although exact size depends on detail and noise.

Choosing an output format

Keep the original format when compatibility already suits the job. JPEG is practical for photographs but removes transparency. PNG keeps transparency and sharp graphic edges, often with larger photographic files. WebP usually gives compact web images and supports transparency. A format change is a new encoding, not a simple filename change.

Quality, metadata, and privacy

JPEG and WebP quality controls compression, not dimensions. PNG output is lossless. Processing strips most embedded metadata, including camera details and location data, which can be useful for privacy but may remove information you intended to keep. Source files stay on this device, and the download is created in memory by the browser.

Limitations and assumptions

Static images up to 30 MB and 40 megapixels are accepted. Animated PNG and WebP files are rejected so a silent one-frame result cannot occur. Very large jobs may use substantial memory, especially on phones. Enlarging an image creates more pixels but cannot recover detail that was never captured. Color-profile handling varies by browser.

Image Resizer FAQ

Why did my file get larger?

A larger pixel size, a less efficient format, or a higher quality setting can outweigh resizing.

Can I resize several images together?

Yes. Select multiple files and the results download as one ZIP package.

Does 50% mean half the file size?

No. It means half the width and height. Compressed file size depends on image content and format.