Image Resizer
What is Image Resizer
Image Resizer is a free browser-based tool that lets you change the dimensions of any JPEG, PNG, or WebP image to exact pixel values. Upload an image, enter your target width or height, and the tool instantly generates a preview of the resized result. You can lock the aspect ratio to avoid distortion, choose the output format, and download the result — all without sending your image to any server.
How to use
- Upload an image by clicking the drop zone or dragging a file onto it.
- Enter the desired width or height in pixels.
- Toggle 'Keep aspect ratio' to automatically calculate the other dimension.
- Select the output format — JPEG, PNG, or WebP.
- Click Download to save the resized image to your device.
When to use it
Need profile photo thumbnails at exactly 200×200 px for a web app? Drag each photo in, set width and height to 200, uncheck the aspect ratio lock for a square crop, and download the resized file in seconds. No desktop editor to open, and nothing leaves your browser.
Frequently asked questions
Will resizing distort my image?
Not if you keep 'Keep aspect ratio' checked. With it enabled, changing one dimension automatically recalculates the other to preserve the original proportions.
What is the maximum image size I can resize?
There is no server-side limit since processing happens entirely in your browser. Very large images (above 30 MP) may be slow on older devices due to memory constraints.
Does my image get uploaded to a server?
No. All resizing happens locally in your browser using the Canvas API. Your images never leave your device.
Can I enlarge a small image to a bigger size?
Yes, but upscaling reduces sharpness since the browser interpolates new pixels from existing ones. For best results, only downscale — or use an AI upscaler for large enlargements.
Which output format should I choose?
Choose WebP for web use (smallest file size), PNG for images that need transparency or lossless quality, and JPEG for photos shared via email or social media.
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