Image Resizer

Image resizing is one of the most common tasks in web development and digital media workflows. Whether you need to prepare images for a website, social media, email templates, or print materials, having the right dimensions is essential for both visual quality and performance. This image resizer works entirely in your browser using the HTML5 Canvas API. When you upload an image, it is drawn onto a canvas element at the specified dimensions, then exported as a high-quality PNG file. No data leaves your computer — the processing happens locally. The tool supports locking the aspect ratio so you can resize proportionally. When locked, changing the width automatically adjusts the height (and vice versa) to maintain the original proportions. This prevents the image from appearing stretched or squished. Common use cases include preparing thumbnails for websites, resizing photographs for email attachments to reduce file size, creating images at specific dimensions required by social media platforms (e.g., 1200x630 for Facebook OG images), and batch-preparing assets for responsive web design. Tip: For best quality when upscaling, start with the highest resolution source image available. Downscaling typically produces better results than upscaling, as enlarging a small image can introduce blurriness or pixelation artifacts.