Image Resizer
Resize images to exact pixel dimensions with optional aspect-ratio lock, exported as PNG, JPG or WebP.
Why use this tool?
Resize an image to exact pixel dimensions or by percentage - for profile photos, website images or upload size limits - and save it as JPG, PNG or WebP.
How to use it
- Upload, drop or paste an image.
- Enter a width or height (aspect ratio stays locked by default) or click a percentage.
- Choose a format and download.
Pixels, aspect ratio and file size
An image's dimensions are its width and height in pixels. Resizing changes those dimensions; it also reduces the file size, because fewer pixels need to be stored. If you only need a smaller file at the same dimensions, use the Image Compressor instead.
The aspect ratio is the proportion of width to height. With the ratio locked (the default), entering a new width calculates the matching height: a 4,000 × 3,000 photo resized to 1,200 pixels wide becomes 1,200 × 900. Unlocking it lets you set both freely, which stretches or squashes the picture.
Choosing a size
Common targets: profile pictures are usually square, around 400 × 400 to 800 × 800 pixels. Website images rarely need to be wider than 1,600-2,000 pixels, and blog thumbnails are often 1,200 × 630 (the size used for link previews on most social networks). Email attachments are friendlier below about 1,500 pixels wide.
Making an image larger than the original can't add detail. Upscaling spreads the existing pixels over a bigger area, so the result looks softer or blurry. Always resize down from the largest original you have.
Picking a format
JPG is best for photos and gives small files, but it doesn't support transparency. PNG is lossless and keeps transparency, which suits logos, screenshots and graphics with text, but photos saved as PNG are large. WebP is a modern format that gives smaller files than JPG for photos and also supports transparency; all current browsers display it.
Everything happens in your browser: the image is drawn onto a canvas at the new size and exported, so it never leaves your device.
Frequently asked questions
Will resizing reduce quality?
Shrinking an image keeps it sharp at its new size. Enlarging it beyond the original makes it softer, because no new detail can be created.
How do I resize without distorting the image?
Keep the aspect ratio locked and change only the width or the height; the other value is calculated for you.
Which format should I download?
JPG or WebP for photos, PNG for logos, screenshots and anything that needs a transparent background.