Frequently asked questions
How do I resize an image to 400×400?
Drop your image into the box above — the width (400) and height (400) are already filled in — choose Fit or Fill, and download. There is no manual cropping or guesswork.
What aspect ratio is 400×400?
400×400 has a 1:1 aspect ratio and works out to about 0.2 megapixels. It is a perfect square.
Will resizing blur my image?
Making an image smaller stays sharp. Enlarging a small image beyond its original size will look softer, because no tool can add detail that was never captured — start from the largest original you have.
Is my image uploaded?
No — resizing happens entirely in your browser and the file never leaves your device.
What 400×400 is used for
400×400 pixels is the standard size for profile pictures and avatars on forums, social platforms and chat apps. It has a 1:1 aspect ratio (a perfect square) and is roughly 0.2 megapixels — large enough to look crisp in that context without carrying unnecessary file size.
Fit versus Fill — which to choose
Crop to a centred headshot before resizing for the most flattering avatar, then use "Fill" to lock in the exact square.
In short: Fit scales your whole image to sit inside 400×400 without cropping, so nothing is cut off but the result may not fill the frame exactly. Fill scales and crops so the output is exactly 400×400 with no borders — the right choice when the platform demands that precise size.
How to get the best result
Start from the highest-resolution original you have, since resizing down preserves quality far better than scaling a small image up. If the file also needs to be under a size limit after resizing, run it through the image compressor. Need a different target? The image resizer accepts any custom width and height, and the cropper handles aspect-ratio changes.