What this tool does
This tool changes the pixel dimensions of an image. You can set an exact width and height in pixels (with an aspect-ratio lock so nothing stretches), or scale by a percentage.
It also shows the exact output dimensions and file size before you download, and can convert the format at the same time.
How to use it
- Choose an image — the tool reads and shows its original size.
- Pick pixel mode to enter an exact width and height, or percent mode to scale (e.g. 50%).
- With aspect ratio locked, changing one side adjusts the other automatically so the image is never distorted.
- Optionally choose a different output format (JPG, PNG or WebP).
- Press “Resize image”, check the output size, then download.
Supported formats
- JPG / JPEG
- PNG
- WebP
- GIF (first frame)
- BMP
Limitations
- Enlarging far beyond the original size cannot add real detail — the result will look soft.
- GIF and BMP input is re-encoded as PNG, because browsers cannot re-encode those formats directly.
- Output is capped at 12000×12000 px to protect low-memory devices.
Frequently asked questions
Will resizing reduce my image quality?
Downscaling (making it smaller) keeps images looking sharp. Upscaling (making it larger) cannot invent detail, so large enlargements look soft — the tool won't pretend otherwise.
How do I keep the image from getting stretched?
Keep “Lock aspect ratio” switched on (it is on by default). Then the width and height always change together in the original proportions.
Can I resize a photo for a form that asks for exact dimensions?
Yes — choose pixel mode and enter the exact width and height the form requires. Turn the lock off only if the required dimensions have a different aspect ratio than your photo.