Resize Image Dimensions
Resize image width and height online. Change dimensions or scale by percentage instantly.
Use this tool to resize image in KB or pixels online. You can downscale dimensions by custom percentages, enter exact width/height in pixels with an aspect-ratio lock, or set a target file quota in KB. All computations execute locally in client-side RAM using the browser Canvas. Photos are never uploaded, keeping your personal data completely private and secure.
Drag & Drop images to resize
Supports PNG, JPG, and WEBP. Scale by pixels or percentage.
How to Resize Image Dimensions Online
Need to crop or resize images to meet website layouts or form guidelines? Here is how to use our resizer:
- Upload: Drop your photos into the dropzone above or click "Browse Files".
- Choose Resizing Mode: Select "Percentage" to scale down (e.g., to 50% width) or "Dimensions (px)" to enter exact widths and heights.
- Aspect Ratio Lock: Keep the Aspect Ratio Lock active (default) to ensure your image scales proportionally without stretching or distorting. Turn it off to stretch values manually.
- Select Save format: Choose to save as JPG, PNG, WEBP, or keep the original format.
- Process & Download: Click "Resize Images" to process all images in the queue, and download your resized results.
Image Resizing vs. Image Compression: What is the Difference?
While both actions help reduce the final file size of an image, they do so using completely different methods:
Image Resizing (Dimension Scaling)
Resizing physically changes the pixel dimensions (Width x Height) of the image. For instance, resizing a 4000x3000 photo to 800x600 reduces the total pixels from 12 million to 480,000. This dramatically drops file size because the canvas holds fewer details, but it makes the image smaller on screen.
Image Compression (Quality Adjustment)
Compression keeps the pixel dimensions exactly the same, but decreases the internal detail density. It looks for adjacent pixels with similar colors and groups them together, or removes unnoticeable color variations (lossy compression). This reduces file size while keeping the visual dimensions large, though excessive compression can cause blocky artifact textures.
💡 SEO Best Practice: For optimal web performance, first Resize your images to the exact width needed by your website template (e.g., 800px for blog content), and then Compress them to WebP format to ensure they load in milliseconds!