Pixels, percent and aspect ratio

Type only the width (or only the height) and the other side is calculated so the photo is not stretched.
Turn off “keep ratio” only when a form demands exact dimensions such as 600×600 — or crop to a square first so nothing is distorted.
“Don’t enlarge” stops small images from being blown up, which only makes them blurry.
By percent: 50% halves both sides, which makes the file roughly four times smaller.

Common sizes

1Drop your images or paste one with Ctrl+V.
2Enter the new width or height in pixels, or choose a percentage. Keep “aspect ratio” on to avoid stretching.
3Download each resized image, or all of them as a ZIP.

Are my files uploaded anywhere?

No. Everything runs inside your browser on your own device. Nothing is sent to a server, so it works even offline once the page has loaded.

Will resizing reduce quality?

Making an image smaller keeps it sharp because we use high-quality smoothing. Enlarging cannot add real detail, so “Never enlarge” is on by default.

What format is the result?

The same as the original: JPG stays JPG, PNG stays PNG and WebP stays WebP. HEIC and other formats are saved as JPG.

Can I resize many photos to the same size?

Yes. Set the size once, then drop all your photos; each one is resized with the same settings.