Image Resizer
Resize images by exact dimensions or percentage while keeping the aspect ratio. Export as PNG, JPEG, or WebP. Free, runs entirely in your browser.
Drop an image here or
Reference
How does image resizing work?
Image resizing changes the pixel dimensions of a raster image. When you reduce size, pixels are merged or sampled using an interpolation algorithm (bilinear, bicubic, or Lanczos). When you enlarge, new pixels are created by interpolating existing ones. The aspect ratio (width÷height) should be preserved to avoid stretching or squishing the image. Modern browsers use high-quality bicubic interpolation via the <canvas> API, producing results comparable to desktop software.
Common use cases
- Social media — resize photos to platform-specific dimensions (e.g., 1080×1080 for Instagram, 1200×628 for Facebook).
- Web optimization — reduce image dimensions to decrease file size and improve page load speed.
- Thumbnails — create smaller preview images for galleries, e-commerce listings, or blog posts.
- Email attachments — shrink large photos to fit within email size limits.
- Print preparation — resize images to match a specific print size at the required DPI.
Privacy
All processing runs 100% in your browser. No images are uploaded to any server.