Image Resizer
Scale images by exact pixel dimensions or percentage with aspect ratio lock, fit options, and real-time preview.
Resize without losing the shape you need
Use the aspect lock to keep the original proportions. Unlock it when you need a specific box, then choose whether to crop to fill, add space around the image or stretch it. Enlarging an image adds pixels, not missing detail.
Example Walkthrough: Resizing an Image for Web Display
Adapting a high-resolution photograph for a website banner or presentation requires reducing dimensions so the image loads quickly without wasting bandwidth.
- Define Target Width or Height: Enter your target pixel width or height, or use the percentage slider to scale proportionally.
- Lock Aspect Ratio: Keep the aspect ratio lock enabled so height adjusts automatically when width changes, preventing distorted or squished images.
- Select Fit Mode: Choose Contain to fit the full image within the dimensions, Cover to fill the frame and trim edges, or Stretch to force exact dimensions.
- Download Resized Image: Check the resulting dimensions in the inspector panel and download the resized file.
Understanding Fit Modes and Upscaling Limitations
When width and height are adjusted independently, fit modes determine how the image conforms to the new frame. Contain preserves all pixels and adds background fill if aspect ratios differ. Cover fills the entire frame by cropping excess edges. Stretch forces the image into the exact dimensions, which can distort proportions. Note that while downscaling produces sharp results, upscaling a small image cannot recreate missing optical details.
Common questions
What is the difference between resizing and compressing?
Resizing changes the actual number of pixels (width and height). Compressing alters how efficiently pixel data is encoded to reduce file size in kilobytes, which can be done with or without changing dimensions.
How do I prevent my image from looking stretched?
Keep the Lock Aspect Ratio toggle enabled. This ensures proportional scaling so faces, text, and objects retain their natural proportions.
Can I make a low-resolution image high-resolution?
Upscaling increases the pixel count using interpolation, which helps avoid pixelated blocks, but it cannot restore fine details that were not present in the original capture.
Are my images processed on a server?
No. All scaling and canvas operations execute locally in your browser memory via HTML5 Canvas. Your files remain on your device.