Image Resizer
Resize images in your browser. Set width/height or lock aspect ratio. No upload.
No upload, no data sent β everything runs in your browser.
About this tool
The image resize tool changes an image's dimensions (width and height). It runs in your browser and never uploads your images. Shrinking and enlarging behave very differently, and knowing that keeps your results clean.
Enlarging "invents information that is not there"
Shrinking looks clean, but enlarging fills in pixels the original does not have by guessing, so edges get blurry or rough. The more you stretch a small image, the more quality drops. If you plan to use an image large (for print, say), it pays to start from as large a source as possible.
Display size and file size are different
Shrinking only the on-screen size with HTML/CSS leaves the image file just as large, so loading stays heavy. To make a page lighter and faster, you have to reduce the actual pixel dimensions with this tool for it to take effect.
"Fit within" mode never enlarges
The mode that shrinks to fit within a maximum width and height, keeping the aspect ratio, never enlarges beyond the original. It is handy for safely fitting under an upload limit or into a display frame.
Combine with compression to go smaller
Reducing dimensions tends to reduce file size, but to go a step smaller, pair resizing with an image compression tool afterward.
How to use
- Select or drag & drop an image file.
- Set width/height (lock aspect ratio to auto-compute one side).
- Choose a format, check the preview, and Download.
FAQ
Are my images uploaded to a server?
No. Resizing happens entirely in your browser and the images you select are never sent externally. Even photos of people or images you cannot share stay on your device, so it is safe.
Can it keep the aspect ratio?
Yes. Set a width and the height is computed, or set a height and the width is computed, so you resize without distorting the proportions and avoid an awkwardly stretched image.
Can I enlarge beyond the original?
Enlarging is possible, but stretching a small image up can make edges blurry or rough. To keep results crisp, favor shrinking.
Can I fit an image within a set size?
Yes. You can shrink an image to fit within a maximum width and height while keeping the ratio. In that mode it is never enlarged beyond the original.
Does the file size shrink too?
Reducing the dimensions tends to reduce the file size, but if you want it even smaller, combine resizing with image compression afterward.
Which image formats are supported?
Common formats such as PNG and JPEG. JPEG is easy to work with for photos, and PNG for figures and screenshots.