Image Resizer

Tool Guide

Tool Overview

The online image resizer, i.e. the online image enlarge/shrink tool, can enlarge or shrink an image to any size. Just enter the desired image width, and it automatically calculates the height while keeping the original aspect ratio, generating a new image in one click.

Because some platforms have explicit requirements for image dimensions - for example, an image must be at least 512 pixels - but we only have a 400-pixel-wide image that cannot pass the platform's validation rules, you just need to use the tool to change the image size to 512 pixels.

Note: this tool directly stretches or shrinks the image proportionally; no AI algorithm is used to upscale during stretching - it is only pixel interpolation, so an enlarged image may be blurry. For image enlargement, this is only a stopgap to meet the platform's validation rules; we still recommend using higher-definition image processing for a better result.

The image supports output format selection; you can upload an image in any format and convert it directly to JPG or PNG output.

Image compression quality only applies to JPG; PNG automatically ignores this parameter. The higher the quality, the larger the image size, and vice versa.

If you need to batch-resize images or compress image sizes, you can use the online image conversion master.

If you need the image to output a fixed size, such as making it smaller than 50 KB, please use the online image size modifier.

How to Use

Set your desired output image size and format, click to upload an image or drag it onto the page to quickly load it, and the tool automatically processes it to the specified dimensions. Click the download button or the preview image to save the image locally.

If it cannot download automatically, save it manually: on desktop, right-click the image and choose Save As; on mobile, long-press the image to save it to your phone.

This tool processes images only in your browser and does not upload them to any network server, so you can use it with confidence. It may not support some older browsers; please use the latest browser version for a better experience.