Resize an image to exact pixel dimensions
Set the width and height you need. The aspect ratio stays locked unless you turn it off, so nothing gets stretched by accident.
Picking the right number
There are only three reasons to resize an image: to fit a slot, to make a file smaller, or to make it sharper on a high-density screen.
Fitting a slot is the common case — an upload form that wants 600 × 600, or a marketplace that insists on exactly 1000 × 1000. Use the exact numbers, and turn the ratio lock off if the slot is a different shape than your photo; something will be cropped or squashed, and this tool squashes rather than crops, so check the preview.
Making a file smaller is better served by the compressor, which keeps dimensions and trims quality. Resizing to 50% cuts pixels by 75%, which is a much blunter instrument.
Sharpness on retina screens means uploading at twice the display size. A 400-pixel-wide image in a 200-pixel slot looks crisp on a phone.
Upscaling does not add detail
If you ask for a larger image than the original, the browser interpolates — it guesses at pixels that were never captured. The result is soft, never sharp. There is no algorithm here that invents detail; if you need a genuinely larger image, you need a better original.
The tool will still do it, because sometimes a slightly soft 1200-pixel image is better than a rejected upload. Just do not expect a 600 × 600 photo to become a usable 2400 × 2400 print.
Questions
What does “keep aspect ratio” do?
It ties the two fields together: type a width and the height follows. Turn it off when a form demands an exact non-proportional size.
Will resizing reduce quality?
Resizing down loses no visible quality — averaging pixels is not destructive. Resizing up always softens the image.
What resolution should I use for print?
300 dpi is the usual standard. Multiply inches by 300 to get pixels: 4 × 6 inches = 1200 × 1800.
Can I resize several images at once?
Not in this version. One at a time, in the tab.