Image Resizer
Drag an image here or click to choose
Or paste an image with Ctrl+V
Max 50 MB · 100 MP
- Upload your image.
- Choose a mode: by pixels, entering width or height; by percentage; or by target file size.
- Keep aspect ratio locked to avoid distortion — enter just the width and the height follows.
- Pick the resampling algorithm, the output format and the quality.
With the ratio locked, entering one dimension is enough: the other follows. That is the right behaviour in most cases.
Unlocking lets you force exact measurements, but the image stretches or squashes. To fit a differently proportioned space without deforming, crop rather than stretch.
Enlarging beyond the original is possible up to 200%, but it creates no detail: existing pixels are interpolated and the result looks softer than the source.
Shrinking an image means deciding what to do when several source pixels collapse into one destination pixel.
High quality averages a larger neighbourhood, preserving detail better and avoiding the jaggedness that shows on diagonal lines and text.
Low quality is faster and fine for a small thumbnail, where the detail would be lost anyway.
For screenshots and images containing text, always use high quality: that is where the difference is most visible.
Size savings come far more from dimensions than from quality. Halving the width removes roughly three quarters of the pixels.
A 4000 pixel photo displayed in an 800 pixel slot wastes bandwidth and load time with no visual gain — and it weighs on page performance metrics.
The order that works is resize first to the real display dimension, compress second.
All processing runs in your browser: the image is never uploaded anywhere.
Frequently asked questions
No. Enlarging interpolates existing pixels and creates no new detail. The result looks softer than the original, and the effect grows with the amount of enlargement.
The aspect ratio was unlocked and both dimensions were forced. To fit a differently proportioned space, crop instead of stretching.
High quality for any image with text, thin lines or detail. Low quality only for small thumbnails, where the difference does not show.
Both, in that order. Resizing to the real display dimension saves far more than tuning quality, and compression afterwards refines the result.
No. Resizing happens in your browser and the file never leaves your computer.