How to Resize an Image and Convert Between PNG, JPG and WebP

Change an image to the exact size you need and switch its format — keeping it sharp and never uploading it.

Resizing and converting, explained simply

Two things often go together when you prepare an image. Resizing changes how big the picture is, measured in pixels (width and height). Converting changes the file format — for example from PNG to JPG. The Resize & Convert Image tool does both, in your browser, without uploading your file.

Why you might resize an image

A website asks for an exact size, like 1200 by 630 pixels for a share image.
You need a square photo for a profile picture.
A huge camera image is far bigger than it needs to be for the web.
You want every image in a set to be the same size.

Why you might convert the format

PNG to JPG to make a photo much smaller.
JPG to PNG when you need sharp edges or a transparent area.
To WebP to get the smallest file at the same quality for a faster website.

Step by step

Open the Resize & Convert Image tool.
Add one or more images.
Set a width and/or height, and choose the output format (PNG, JPG or WebP).
Download your resized, converted images.

Keep the shape: aspect ratio

"Aspect ratio" is the relationship between width and height. If you change only one and keep the ratio locked, the tool works out the other number for you, so the picture is not stretched. Leave "lock aspect ratio" on unless you truly need exact dimensions and do not mind some stretching. Forcing a wide photo into a square, for example, will squash it — so it is usually better to resize with the ratio locked and then crop.

Bigger or smaller?

Making an image smaller almost always looks fine. Making it much bigger than the original does not add real detail, so it can look soft or blocky. If you need a large, sharp image, start from the biggest original you have.

Is it private?

Yes. Resize & Convert runs entirely inside your browser. Your images are processed on your device and never uploaded, so nothing personal leaves your computer.

Tips

Note the size you need first. Websites usually tell you the exact pixels they want — enter those.
Choose WebP for the web. It usually gives the smallest file at the same quality.
Compress after resizing. If the file is still large, run it through Compress Image for an extra size cut.
Keep the original. Save your full-size file in case you need a different size later.

Try it now — free and private

Need a different size or format? Open the Resize & Convert tool and set your width, height and format.