Resize images to custom pixel dimensions or percentage scales. All rendering runs locally in your browser using HTML5 Canvas, so no files are uploaded.
Key Features of Image Resizer
- Custom Dimension Inputs Specify exact height and width pixel targets for precise scaling.
- Aspect Ratio Lock Lock the proportions of your image to prevent stretching or squishing.
- Percentage Scaling Scale images up or down by relative percentages instead of absolute pixels.
- Instant Previews View live rendering of the resized image before saving.
Image Resizer Examples
Scale down desktop wallpaper
Resize a 4K image down to standard Full HD (1080p) dimensions.
Input
wallpaper.png (3840x2160)Output
wallpaper.png (1920x1080)Create user avatar
Shrink a high-res photo to standard avatar proportions.
Input
photo.jpg (1200x1200)Output
photo.jpg (150x150)How to Use Image Resizer
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1. Upload Your Image
Drop a PNG, JPEG, or WEBP image onto the drop zone, or click Browse Files. The original dimensions are shown automatically.
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2. Set New Dimensions or Scale
Enter a target width and height in pixels, or use the percentage scale input. Toggle aspect ratio lock to prevent stretching.
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3. Download the Resized Image
A live preview updates as you adjust settings. Click Download Resized Image to save the output.
Common Use Cases for Image Resizer
- Social Media Covers Prepare exact header, banner, and profile picture dimensions.
- Avatar Adjustments Crop or shrink high-res profile shots into lightweight user avatars.
- Bulk Banner Scaling Standardize dimensions across digital store listing galleries.
The Technical Details
Redraws canvas layers using custom scaling interpolation matrices directly inside the client thread.
Frequently Asked Questions
Does aspect ratio lock work automatically?
Yes. When aspect ratio lock is enabled, changing width automatically updates height proportionally, and vice versa.
Is upscaling supported?
Yes. You can increase dimensions beyond the original, but the result will be upscaled using browser canvas interpolation, which may appear softer than the original.
Which formats are supported?
Input supports PNG, JPEG, and WEBP. Output format matches the input format to preserve file type.
Is my image uploaded to a server?
No. All resizing uses the HTML5 Canvas API entirely in your browser. Your file never leaves your device.