How to resize image dimensions online
Resizing an image changes its physical width and height dimensions in pixels. Whether you need to fit photos into website banners, meet social media post specifications, or reduce physical dimensions for email attachments, our free resizer makes it simple.
Step-by-Step Instructions
- Upload your files: Drag and drop one or more images into the upload area above.
- Set dimensions: Choose whether to specify exact Pixel width/height or scale by Percentage (e.g., 50% scale down).
- Maintain aspect ratio: Keep the aspect ratio lock checked to avoid stretching or distorting your photo's proportions.
- Resize & Save: Click Resize Images to generate and download your new scaled files.
Why Maintain Aspect Ratio?
Aspect ratio is the proportional relationship between an image's width and height. When resizing a 1920x1080 image to a width of 1280 pixels, keeping aspect ratio locked automatically calculates the height as 720 pixels. This prevents subjects in your photos from appearing squished or stretched out of shape.
Pixel Scaling vs. Percentage Scaling
Use Pixel mode when you have exact dimensional requirements (such as 1200x630 pixels for Facebook Open Graph preview cards). Use Percentage mode when you want to quickly shrink large camera photos (e.g. reducing 4000px raw shots down to 50% size for fast sharing).
Frequently Asked Questions
Does resizing an image make the file size smaller?
Yes! Decreasing the pixel dimensions of an image drastically reduces the total number of pixels, which significantly decreases file size (in KB/MB).
Can I enlarge small images without losing quality?
While you can scale an image up, enlarging small raster graphics may result in slight blurriness. It is best practice to downscale from higher resolution source files.
Is this image resizer private?
Yes, 100% private. Resizing calculations occur locally in your web browser canvas — files are never sent to external servers.