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Image Resizer Online

Drop an image here or click to select

Resize Images to Exact Dimensions, Presets, or a Percentage

An online store demands product photos at exactly 800 by 800 pixels, a social platform crops your banner awkwardly, or an email newsletter rejects a 4 MB attachment. The Image Resizer changes a picture to an exact width and height, a common preset, or a percentage of the original, and it can lock the aspect ratio so proportions never distort. The result is a correctly sized file in seconds, ready for upload, printing, or embedding, with the option to keep or drop the original proportions.

How to Resize an Image

  1. Open the Image Resizer and upload the image you want to change.
  2. Choose a mode: exact dimensions, a preset like 1080p or 1:1 square, or a percentage such as 50%.
  3. Enter the target width and height, or pick the preset, and enable the aspect lock if you want the ratio preserved.
  4. Select an output format and quality for the resized file.
  5. Click resize, preview the result, and download your new image.

Real Example: Preparing Product Photos for a Store

Your marketplace requires square thumbnails of 800 by 800 pixels, but the source photos are 3000 by 2000. Resizing with the 1:1 square preset and aspect lock keeps the center composition and fills the square, while a second pass at 50% produces the small preview image used in search results. Both files come from the same upload. The original stays untouched on your device, so you can experiment with several sizes and keep only the ones the store accepts.

InputOutput
product.png at 3000 x 2000product-square.png at 800 x 800
Mode percentage, 50%product-small.png at 1500 x 1000

Tips for Distortion-Free Resizing

When You Should Resize an Image

Frequently Asked Questions

What resize modes are available?

You can enter exact width and height, pick a preset such as 1080p or a 1:1 square, or scale by a percentage of the original size. Each mode produces the pixel dimensions you see in the preview.

What does the aspect lock do?

The lock keeps the width-to-height ratio constant while resizing. Changing one dimension automatically adjusts the other, so the image never looks squashed or stretched.

What happens if I disable the aspect lock?

Without the lock, the image is scaled to exactly the numbers you type, even if that changes the proportions. Use this deliberately for fills and crops, not for people or text.

Can I resize without losing quality?

Downscaling keeps sharpness and detail, especially with a lossless output format. Upscaling cannot create new detail, so the result is always softer than the source.

Which output formats can I choose?

Resized images can be saved as PNG, JPEG, WebP, or AVIF. Pick PNG for graphics and transparency, or a lossy format when file size matters more.

Is the aspect ratio kept with percentage mode?

Yes. Percentage mode scales both dimensions by the same factor, so the proportions are always preserved without any extra settings.

Can I resize an image with transparency?

Yes. Transparency is preserved when you save as PNG or WebP. Choosing JPEG flattens the transparency onto a background color.

Why is my resized image still large?

File size depends on pixels and compression, not just dimensions. Lower the quality setting or convert to WebP or AVIF after resizing to shrink the file further.

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