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Image Resizer

Resize images in-browser and download optimized versions quickly.

How This Tool Works

This image resizer runs entirely in your browser — your image is never uploaded to a server. You select a file from your device, enter target width and height dimensions in pixels, and the tool uses the HTML5 Canvas API to redraw the image at the new size. The result is available to download as a JPEG or PNG.

Resizing is useful before uploading images to websites, social media, email, or apps with strict size requirements. Smaller dimensions also reduce file size, which speeds up page loads and reduces storage usage.

How to Use

  1. Click the file input and select an image from your device (JPEG, PNG, WebP, and GIF are supported).
  2. Enter the target width in pixels in the Width field. Enter the target height in the Height field.
  3. To maintain the original aspect ratio, calculate the proportional height: new height = (original height / original width) × new width.
  4. Click Resize. The resized image preview and download link appear below.

Common Questions

Will resizing reduce image quality?

Scaling down (reducing dimensions) generally preserves quality well. Scaling up (enlarging beyond the original size) will make the image appear blurry or pixelated because the tool is creating pixels that didn't exist in the original. For enlargement, dedicated upscaling tools using AI interpolation produce better results.

Is my image uploaded anywhere?

No. The entire resize operation happens in your browser using the Canvas API. Your image data never leaves your device. This means the tool also works offline once the page has loaded.

What dimensions should I use for common platforms?

Common targets: Twitter/X profile photo 400×400px, Facebook cover 820×312px, Instagram square 1080×1080px, LinkedIn banner 1584×396px, website hero image 1920×1080px, thumbnail 300×200px. Check the platform's current guidelines as these change periodically.