How to Resize an Image Online

Sometimes a photo is simply too big — for a profile picture, a form upload with a size limit, or a page that needs to load fast. Resizing changes an image's dimensions (its width and height in pixels) so it fits exactly where you need it. This guide covers how to do it, and how to keep your picture looking sharp.

Resize an image in 4 steps

1. Open the Resize Image tool and select your photo.
2. Enter a new width and height in pixels, or set a percentage.
3. Keep the aspect ratio locked so the image doesn't stretch.
4. Download your resized image.

The resizing runs locally in your browser — no upload, no account, and no watermark on the result.

Keep the aspect ratio (avoid stretching)

The aspect ratio is the relationship between width and height. If you change one without the other, the image squashes or stretches and looks distorted. Locking the aspect ratio means that when you set a new width, the height updates automatically to match — so people and objects stay in proportion.

Common target sizes

• Profile photo: often 400 x 400 or 512 x 512 pixels.
• Social post: commonly around 1080 x 1080 (square) or 1200 x 630 (link preview).
• Email attachment: resize down to roughly 1000–1600 px on the long edge to keep the file light.
• Website image: match the space it fills — displaying a 4000 px photo in a 600 px slot just wastes load time.

Always check the exact pixel requirements of the platform you're uploading to, since these vary and change over time.

Resize vs. compress vs. crop

• Resize changes the pixel dimensions of the whole image.
• Compress reduces the file size without changing dimensions — great when you need a smaller file but the same layout. Try the image compressor.
• Crop removes parts of the image to change its shape or framing. Use the crop tool for that.

Frequently asked questions