How to resize an image without stretching or squashing it

To keep the proportions, resize by Percent, or type a width and height and choose Fit: both keep the image's own shape. Only Fill stretches. If you need an exact width and height in a different shape, choose Crop to fill, which trims the edges instead of distorting the picture.

Steps

1. Open Resize image and drop in your image. JPG, PNG and WebP work, and you can add several.
2. Under Resize to, pick how you want to set the size:
   • Percent to scale both sides together. Tap 10%, 25%, 50% or 75%, or type your own number next to Custom.
   • Pixels to type a width and height.
3. With Pixels, choose under When the shape differs: Fit to keep the whole image, or Crop to fill for exact numbers.
4. Check the new size under the preview and drag the divider to compare.
5. Press Download.

Stretching happens when shapes differ

Every image has a shape, its width divided by its height. A photo from most phone cameras is 4:3 (or 3:4 when upright); a widescreen screenshot is 16:9. Stretching happens when you force one shape into another, for example a 4000 × 3000 photo into a 1080 × 1080 square. Something has to give, and the three options give in different ways:

Fit treats your numbers as a box. Ask for 1080 × 1080 with a 4000 × 3000 photo and you get 1080 × 810: the widest the photo can be inside the box without changing its shape.

Crop to fill is the default. It is the right choice when a site insists on exact pixels and the picture has some spare space around the subject. If the subject is near an edge, choose the part to keep yourself in Crop image first.

Percent is the quickest way to keep proportions

If you just want a smaller image, such as halving a large photo before emailing it, Percent does it in one tap. 50% halves both the width and the height, so the image keeps its shape and ends up with a quarter of the pixels. There is nothing to choose about fitting, because the shape cannot change.

Making an image bigger

Enlarging cannot add detail that was never captured; it spreads the existing pixels over more space and the picture looks softer. For that reason the tool keeps your image at its original size when you ask for a larger one, and the result line says Kept at the original resolution, no enlarging. If you need the bigger canvas anyway, for a slide or a print layout, tick Allow enlarging past the original.

Why it stays sharp when shrinking

The tool shrinks with Lanczos resampling, which looks at a wider area of the original for every new pixel. Thin lines and text edges stay crisp instead of turning jagged. That only changes the pixel size. To hit a file size in KB as well, take the result to Compress image after resizing.

Troubleshooting

• My numbers were ignored. With Fit, one side comes out shorter on purpose. Switch to Crop to fill for the exact numbers.
• Faces look wide or thin. Fill is selected. Pick Fit or Crop to fill.
• The top of the picture got cut off. Crop to fill trims evenly from both edges. Crop by hand first, then resize.
• The file is still too large in KB. Resizing reduces pixels, not quality. Compress it afterwards.

Questions

Is there a lock aspect ratio button?

There is no separate lock. Percent and Fit always keep the shape, and Crop to fill keeps it by trimming, so only Fill can distort.

Can I resize many images to the same size?

Yes. Drop them in together. Each gets the same setting, and Download all saves them as one zip.

Does resizing upload my images?

No. Everything happens in your browser, and your images stay on your device.

Which format should I save as?

Keep leaves the format as it was. Choose JPG for photos, PNG for screenshots and graphics, or WebP for a small web file.