Image Resizer

Why resize images?

Websites, forms, and APIs often require maximum width or height. Resizing keeps subjects recognizable while meeting pixel limits and reducing download size.

How to use

1. 1Upload an image.
2. 2Either enter target width and height, or use a percentage scale.
3. 3Leave aspect lock on to avoid stretching (one dimension can be auto calculated).
4. 4Download the resized file.

Key features

When to resize vs compress

Resizing reduces pixels; compression reduces bytes per pixel. Use both when photos are too large in dimensions and file size.

Common use cases

• Avatar and profile picture constraints
• Product thumbnails
• Banner templates

Why upscaling does not add detail

• Enlarging an image invents pixels by interpolating between the ones that exist. It can make a picture bigger, but it cannot recover detail that was never captured, and past about 150% the result usually looks softer than the original did.
• If you need a larger image, going back to the source at a higher resolution beats any amount of resampling.
• Downscaling is the opposite: it genuinely discards information and almost always looks good, which is why reducing dimensions is such an effective way to shrink a file.

Aspect ratio, and the two ways to change it

• Locking the aspect ratio keeps the proportions, so setting one dimension derives the other. This is what you want almost always, because unlocking it stretches faces and circles in a way that reads as wrong even to people who cannot say why.
• When an image genuinely has to fit a different shape, crop rather than stretch. Cropping loses part of the picture but keeps everything that remains looking correct.

Tips & best practices

Privacy & security