Image Resizer
Drop in an image and resize it to any dimensions, with optional aspect-ratio lock.
What is an Image Resizer?
An image resizer changes the pixel dimensions of an image — its width and height — while optionally maintaining the original aspect ratio to prevent distortion. Resizing is necessary when images are too large for their intended use, wasting bandwidth and slowing page load times.
This tool resizes images in your browser using the Canvas API, with no upload required.
How to resize an image online
- Upload your image by clicking or dragging it into the upload area.
- Enter the desired width and/or height in pixels.
- Enable Keep aspect ratio to prevent stretching.
- Click Resize and then Download to save the result.
Frequently Asked Questions
Does resizing an image lose quality?
Scaling an image down generally has minimal visible quality loss. Scaling up always reduces quality because pixels are interpolated — the result looks blurry. There is no digital way to add detail that was not in the original.
What is aspect ratio?
Aspect ratio is the proportional relationship between an image's width and height, expressed as width:height (e.g. 16:9 for widescreen, 1:1 for square). Maintaining the aspect ratio when resizing prevents the image from appearing stretched or squashed.
Is there a maximum image size I can resize?
There is no hard limit. Processing runs locally in your browser using the Canvas API, so very large images may take a few seconds and consume significant memory.
What format does the resized image download as?
The tool outputs the resized image in the same format as the input (JPEG, PNG, or WebP). You can optionally change the output format in the settings.