Scale image dimensions in pixels or percentages with aspect ratio locking and high-quality canvas resampling.
The Image Resizer lets you change the physical dimensions of images quickly and easily. You can type exact target widths and heights in pixels, scale by percentage, and lock the aspect ratio so pictures never appear stretched.
All resizing runs locally inside your browser. No photos are sent to external servers, making it ideal for preparing graphics for web pages, emails, and social media.
Sellers resize product photography to standard platform dimensions for Amazon, eBay, and Shopify.
Webmasters resize giant stock photos to match specific column widths and avoid slowing down site visitors.
Marketers scale images to 600px width so email templates load instantly in subscribers' inboxes.
Select an image from your computer or phone.
Enter your desired width and height in pixels, or choose a percentage scale.
Click "Download Image" to save your newly scaled file.
Accurate pixel and percentage-based dimension scaling
Aspect ratio lock preventing distorted or stretched images
Smooth bicubic canvas resampling for sharp visual clarity
100% private in-browser processing with zero server uploads
Downscale a giant photo for a blog article.
Original dimensions: 4000 x 3000 pixels (8MB).
Downscaling reduces file size substantially while keeping images crisp on high-density screens.
Solution: Ensure the "Lock Aspect Ratio" checkbox is turned on so width and height scale proportionally together.
MWT Labs tools are built using modern web primitives—including WebAssembly, Web Workers, and native HTML5 Canvas / Cryptography APIs. When you process images, parse PDF documents, format JSON payloads, or calculate financial schedules, execution happens strictly within your local browser memory sandbox.
The resizer scales your image using browser canvas rendering. You can specify exact pixel dimensions (width and height) or scale proportionally by percentage.
Yes. The "Lock Aspect Ratio" toggle is enabled by default, ensuring that changing width automatically updates height proportionally so your image never looks stretched or squished.
No. All scaling calculations run locally inside your browser memory. Your images are never uploaded or stored on any external server.
Resizing makes large photos smaller or scales images to specific dimensions. Enlarging a small low-resolution image cannot invent missing details and may appear soft.
Resizing alters the physical pixel dimensions (width and height) of the image. Compressing reduces file size (megabytes) by optimizing data compression without necessarily changing pixel dimensions.
Crop, rotate, and resize images with aspect ratio presets for social media and documents.
Compress PNG, JPEG, and WebP images to reduce file size without losing visual quality.
Convert between PNG, JPEG, WebP, AVIF, and SVG image formats directly in your browser.
Explore color harmonics, convert HEX/RGB/HSL, and check WCAG contrast ratios.