Your file stays private. This page processes the image inside your browser. It does not upload the file to our server.
How to use this page
- Choose an image in the resizer workspace.
- Use exact pixels for a form, or percentage when you only want half or double the original.
- Keep aspect ratio locked unless you intentionally want a different shape, then download the result.
Worked example: 4000 × 3000 down to 1600 × 1200
Enter 1600 for width with lock on; height becomes 1200. That is a clean 4:3 downscale. Entering 1920 × 1080 with lock on cannot keep both numbers unless the source is already 16:9 — use a 16:9 size page instead.
What this job is for
Locked aspect ratio prevents stretching. If you need a new shape without stretch, crop first or use a size page with crop-to-fill / fit.
Useful limits
Enlarging above 100% makes more pixels but not more real detail. For ready-made social canvases, use the social resizer hub.
The live tool behind this page is Image Resizer. It is the same local engine as the rest of Image Cosmos.
Frequently asked questions
Resize or compress first?
Resize to the pixels you need, then compress if a KB limit remains.
Why did height change when I typed a width?
Aspect lock is on. Turn it off only if you want a non-proportional canvas.
Does resizing upload the photo?
No.
Related Image Cosmos pages
How to Compress an ImageHow to Crop an ImageHow to Convert JPG to PNGHow to Convert PNG to JPGHow to Convert WebP to JPGImage Resizer