About the Image Resizer tool
Resize any image to exact pixel dimensions. Lock the aspect ratio to avoid distortion, or unlock it for exact-fit requirements. Everything happens instantly on your device.
Resizing is done on your device with the browser's canvas. Because there is no upload, there is also no file-size cap beyond your own device's memory.
How to use it
- Add your image or several at once.
- Enter a target width or height — the ratio stays locked unless you unlock it.
- Download the resized files.
Resizing is the fastest way to change file size
File size scales with pixel count, not with width. Halving the width also halves the height, so you remove three-quarters of the pixels — and the file drops to roughly a quarter.
This is why resizing before compressing produces far better-looking results than compressing alone.
Measured on a real photograph
Same image at quality 80, varying only the width:
- 2400 px → 302 KB
- 1600 px → 183 KB
- 1200 px → 136 KB
- 800 px → 71 KB
- 400 px → 24 KB
From 1600 to 800 px the file fell to 39% of its size with the quality setting untouched.
Common mistakes
- Enlarging a small image. Upscaling invents pixels and cannot restore detail that was never captured.
- Unlocking the aspect ratio by accident, which stretches faces and text.
- Resizing below what the destination requires, forcing a second pass from the original.
Questions people ask
What width should I use for a website?
1200–1600 px suits most content images. Hero banners may want 1920 px.
Does resizing reduce quality?
It removes pixels, so enlarging afterwards looks soft. At the display size you intend, it is invisible.
Can I resize a batch?
Yes — the Bulk Image Resizer applies one setting to many files at once.