Free online image tool
Image Resizer
Resize JPG, PNG, or WebP images by entering custom width and height.
Preview
Upload an image to start processing.
What is this tool?
Image Resizer helps you change the pixel dimensions of a JPG, PNG, or WebP image without opening a full design application. It is useful when a website, form, marketplace, profile page, or content management system asks for a specific width and height. Instead of guessing, you can upload an image, enter the dimensions you need, choose how the image should fit, and download a new resized copy.
The most important choice is whether the image should keep its original aspect ratio. Keeping the ratio prevents faces, products, logos, and screenshots from looking stretched. If you need an exact canvas size, fit mode keeps the whole image visible, cover mode fills the target by cropping edges, and stretch mode is available only when exact distortion is acceptable. This makes the tool practical for website thumbnails, product images, blog graphics, profile photos, and social media preparation.
A good resize workflow keeps the original file separate from the exported version. Use the original as your source, then create a new file for each destination. This prevents repeated compression damage and makes it easier to create a second size later if a platform changes its requirements.
How to use Image Resizer
Follow these steps to process your image locally in the browser and download the result.
- Step 1
Upload a JPG, PNG, or WebP image from your device.
- Step 2
Enter the target width and height in pixels.
- Step 3
Turn on keep aspect ratio if you want to prevent distortion.
- Step 4
Choose fit, cover, or stretch depending on whether you prefer padding, cropping, or exact dimensions.
- Step 5
Select the output format and quality when available.
- Step 6
Preview the result and download the resized image as a new file.
Key features
- Custom width and height controls for precise pixel dimensions.
- Keep-aspect-ratio option to prevent stretched images.
- Fit, cover, and stretch modes for different publishing requirements.
- JPG, PNG, and WebP export options where supported by the browser.
- Useful for websites, forms, thumbnails, product images, and social media graphics.
- Creates a new download while keeping the original image unchanged.
Supported formats
The resizer works best with common browser-readable formats such as JPG, PNG, and WebP. Some modern browsers may also decode AVIF, BMP, or GIF still frames, but support depends on the browser and device.
Privacy note
ImageToolkit is designed to handle this task in your browser whenever the selected file type is supported. The image you choose is processed on your device for preview and export, and ImageToolkit does not require an account or intentionally upload the original image to an ImageToolkit server for these browser-first tools.
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Frequently Asked Questions
How do I resize an image without stretching it?+
Enable keep aspect ratio, then change either width or height. The matching side will be calculated so the image keeps its natural shape.
What is the difference between fit and cover mode?+
Fit keeps the whole image visible inside the target size, while cover fills the target size by cropping the edges.
Can I resize images for website thumbnails?+
Yes. Enter the thumbnail dimensions used by your layout, preview the result, and download a smaller optimized copy.
Will the original image be overwritten?+
No. The tool exports a new image file and does not change the original file stored on your device.
Are resized images uploaded to ImageToolkit?+
ImageToolkit is designed to handle this task in your browser whenever the selected file type is supported. The image you choose is processed on your device for preview and export, and ImageToolkit does not require an account or intentionally upload the original image to an ImageToolkit server for these browser-first tools.