How do I resize an image?

Upload an image, enter the desired width and height, and click Resize. Toggle the lock icon to maintain or ignore the aspect ratio.

What formats are supported?

PNG, JPG, and WebP images are supported for both input and output.

Will resizing reduce image quality?

Enlarging images may reduce sharpness. Reducing size generally preserves quality well.

Are my images uploaded to a server?

No. All resizing happens in your browser using the Canvas API. Your images stay on your device.

Resize Images Online Free

Change image dimensions with optional aspect ratio lock

Select an image to resize

Frequently Asked Questions

What is the Online Image Resizer?

The Online Image Resizer is a free browser-based tool that lets you change the dimensions of any image in seconds. Whether you need to scale a photo down for a website banner, enlarge an icon for a presentation, or hit an exact pixel requirement for a social-media profile picture, this tool handles it all without uploading your file to any server. It supports PNG, JPG, and WebP formats and uses the HTML5 Canvas API to perform every transformation directly inside your browser. That means your images never leave your device, keeping your data completely private. There is no sign-up, no watermark, and no usage limit — resize as many images as you need, entirely for free.

When to Use the Image Resizer

Resizing images is one of the most common tasks in everyday digital work. Here are some scenarios where this tool comes in handy:

Preparing product photos or thumbnails for an e-commerce store with strict dimension requirements.
Fitting images into social-media templates that expect a specific width and height.
Reducing image dimensions before embedding them in emails or documents to keep file sizes small.
Scaling up low-resolution icons or logos for print materials or high-DPI displays.
Batch-adjusting screenshots to a uniform size for documentation or blog posts.

How It Works

When you drop or select an image, the tool reads it with the browser's FileReader API and draws it onto an invisible HTML5 Canvas element. You specify the target width and height — or toggle the aspect-ratio lock to scale proportionally — and the Canvas API redraws the image at the new dimensions using high-quality bicubic interpolation. Once the resize is complete you can preview the result and download it in your preferred format. Because every step runs locally through the Canvas API, the process is nearly instant and works offline once the page has loaded. No server round-trip, no data collection, and no third-party scripts — just fast, private image resizing in your browser.