Image Resizer
Resize images online — change image dimensions to exact pixels or a percentage. Batch-ready, no upload.
Need a smaller file size in KB instead? Use the Image Compressor → Need to cut out part of the image? Use the Image Cropper →
Drop images or click to select
JPEG · PNG · WebP · GIF · SVG — batch supported
Exact Dimensions
Set a target width, height, or both. Lock aspect ratio to avoid distortion.
Batch Resize
Upload multiple images at once — all are resized with the same settings.
Private by Default
All resizing happens with the Canvas API in your browser. Images are never uploaded.
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Frequently Asked Questions
How do I resize an image without losing quality?↓
Enlarging an image always involves some quality loss because pixels must be interpolated. To minimise loss when downsizing, use PNG output (lossless) or set JPEG/WebP quality to 90% or higher. The tool uses the browser's Canvas API with bilinear interpolation for smooth results.
Can I resize multiple images at once?↓
Yes. Upload as many images as you need, set your target dimensions and format, then click 'Resize All Images'. All images are processed with the same settings, and you can download them individually or all at once.
Is resizing the same as reducing file size in KB?↓
Not exactly. Resizing changes the pixel dimensions (width × height); file size in KB also depends on compression. Smaller dimensions usually mean a smaller file, and the tool shows the output size after resizing. If your goal is to hit a target size in KB while keeping the dimensions, use the Image Compressor at www.njhouse.kr/tools/image-compressor.
What does locking the aspect ratio mean?↓
Locking the aspect ratio (the padlock icon) keeps the image's width-to-height proportion unchanged. When you enter a width, the height is automatically calculated to match the original ratio, and vice versa. This prevents the image from appearing stretched or squashed.
Are my images uploaded to a server?↓
No. All resizing is done locally in your browser using the HTML5 Canvas API. Your images never leave your device.
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