Image Tools
Image Resizer
Upload an image and resize it to custom dimensions.
Choose an image file to begin.
Image Tools
Upload an image and resize it to custom dimensions.
Choose an image file to begin.
An image resizer lets you quickly shrink, enlarge, or scale photos to exact dimensions—essential whether you're preparing images for social media, email, a website, or print. This tool takes your image and resamples it to your target width and height, making it easy to fit platform requirements without manual software.
An image resizer is a tool that changes an image's pixel dimensions (width and height) while maintaining quality through resampling. It mathematically interpolates pixels to either reduce the image size (downsampling) or enlarge it (upsampling). Resizing differs from cropping because the whole image is preserved—nothing is cut out—and the aspect ratio can be locked or changed freely depending on your needs.
When you upload an image, the resizer reads its current dimensions and colour data. You specify new dimensions—either exact pixels, a percentage scale, or by locked aspect ratio. The tool then applies an interpolation algorithm (usually bicubic or bilinear) to blend existing pixels into the target grid. For smaller outputs, multiple pixels are averaged; for larger outputs, colours are estimated between existing pixels. The result is resampled image data, which is then encoded back into your chosen format (JPG, PNG, WebP, etc.) and ready to download.
| Input | Result | Notes |
|---|---|---|
| Original: 3000×2000 px JPG; target: 1200×800 px | Output: 1200×800 px JPG (40% of original size, ~50 KB if original was ~500 KB) | Common for web use. Smaller file size loads faster; quality remains sharp at this scale. |
| Original: 800×600 px PNG; target: 400×300 px with locked aspect ratio | Output: 400×300 px PNG (exact proportions preserved) | Aspect ratio lock ensures no stretching or distortion; useful for thumbnails or consistent layouts. |
| Original: 600×400 px; target: 120% scale | Output: 720×480 px (scaled by 20% larger) | Scaling by percentage is quicker than calculating new pixel dimensions manually, especially for batch jobs. |
Upsampling (enlarging) a small image causes blur because the tool must guess colours for new pixels. Always resize from a large original image. If you must enlarge, use 'Smart Sharpen' or a tool designed for upsampling.
80–85% quality is imperceptible to the human eye but cuts file size in half vs. 100%. Use 90% if you need extra sharpness (e.g. product photos); use 70% only for thumbnails or previews.
Crop first to remove unwanted areas, then resize. This ensures you're resizing only the final composition and not wasting pixels on unwanted edges.
Static GIFs yes; animated GIFs and videos require different tools that preserve frame sequences. Some batch resizers handle animated GIFs if they keep all frames.
When locked, if you change width, height auto-adjusts to match the original proportions. Unlocked lets you set any width/height freely, which may stretch or squash the image.
Most browser-based tools handle 5–20 at once before slowing down. For bulk jobs (100+), use desktop software like ImageMagick (command line) or Lightroom (GUI), or upload to a service with batch queueing.