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Image Resizer
Resize to exact pixels or percentage with aspect control.
Use the Image Resizer tool
What this image resizer does
Image Resizer changes an image's pixel dimensions. Enter an exact width and height, or a percentage of the original. With the aspect-ratio lock enabled, changing one dimension updates the other, so portraits do not become distorted.
Two fitting modes cover the common cases. “Fit inside” keeps the whole image and may add transparent or white padding; “crop to fill” fills the exact target size and trims the excess. All processing happens locally with high-quality canvas scaling.
Why use it
- Meet a portal's exact upload dimensions, such as 600 × 600 pixels.
- Create consistent thumbnails for a product grid.
- Halve the resolution of screenshots before sharing them.
How to use it
- 1Load an image and read its original dimensions.
- 2Enter a target width or height, or a percentage.
- 3Choose fit-inside or crop-to-fill and the output format.
- 4Download the resized image.
Worked examples
Square thumbnail
Input
1200 × 800 photo · 400 × 400 · crop to fill
Output
400 × 400 image, centre-cropped without distortion
Half size
Input
2400 × 1600 · 50%
Output
1200 × 800
Common mistakes
- Upscaling a small image and expecting more detail; the result is soft.
- Turning off the aspect lock and squashing the image.
- Resizing a transparent PNG to JPEG, which turns transparency black or white depending on the encoder.
Frequently asked questions
Does resizing larger improve quality?
No. Upscaling interpolates existing pixels. It cannot invent detail, and it increases file size.
What happens to transparency?
PNG and WebP preserve it. JPEG has no alpha channel, so transparent areas are filled with white.
Is the original file changed?
No. You download a new file; the original on your device is untouched.