What does this tool do?
Image Resizer scales a picture to any pixel dimensions right in your browser, with an aspect-ratio lock and quick scale presets (25/50/75/100%) for one-click downsizing. You download the result as a PNG and your image is never uploaded. The whole operation happens on canvas on your device, so it stays completely private.
How to use it
- Adjust the values and options.
- See the result in the live preview.
- Copy the generated CSS/code into your project.
What it solves
It is handy when an avatar, cover image or product photo has to hit the exact pixel size a platform demands. Type width and height manually, or lock the ratio and change one value so the other is calculated automatically. The preset percentage buttons instantly drop a large photo to half or a quarter of its size.
Common use cases
Social media profile and cover images, normalising e-commerce product photos to a standard size, shrinking oversized pictures for a website, and fitting email or form upload limits. The aspect-ratio lock guarantees the image stays proportional and undistorted.
Frequently asked questions
Does resizing lose quality?
Downscaling usually gives clean results and the image stays sharp. Upscaling a picture beyond its original size can look blurry because no new detail can be invented, so whenever possible scale down from the original high-resolution file.
Is my image uploaded?
No. All resizing is done in your browser with canvas; the file never leaves your device and is never sent to a server. That makes it safe even for private or sensitive images.
Is Image Resizer free?
Yes. Image Resizer and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. Image Resizer works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.