Will the image lose quality when resized?

Enlarging an image beyond its original size will reduce sharpness because pixels are interpolated. Shrinking an image generally preserves quality well.

What format is the downloaded file?

The resized image is downloaded as a PNG file, which is lossless and supports transparency.

How does aspect ratio lock work?

When the checkbox is enabled, editing the width automatically recalculates the height (and vice versa) to preserve the original width-to-height ratio.

Image Resizer

Resize images to exact dimensions with optional aspect ratio lock, entirely in your browser.

[ choose file ]

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FAQ

Will the image lose quality when resized?: Enlarging an image beyond its original size will reduce sharpness because pixels are interpolated. Shrinking an image generally preserves quality well.
What format is the downloaded file?: The resized image is downloaded as a PNG file, which is lossless and supports transparency.
How does aspect ratio lock work?: When the checkbox is enabled, editing the width automatically recalculates the height (and vice versa) to preserve the original width-to-height ratio.

The Image Resizer lets you upload an image and set a new width and height. Enable the "maintain aspect ratio" checkbox to automatically calculate the other dimension. Resizing is done via the HTML Canvas API — no server involved. Download the result as a PNG.