Image resizer

Shrinking an image in one step samples the original sparsely. Reducing by a factor of four means each output pixel is taken from a small neighbourhood while most of the pixels in between are never looked at, so fine detail turns into speckle. It is most obvious on text in screenshots and on scanned documents.

This tool halves the image repeatedly until it is within a factor of two of the target, then does the final step:

Every pixel contributes to the result at each halving, so detail is averaged down instead of dropped. It costs a few milliseconds and it is the difference between a readable downscaled screenshot and a noisy one.

By pixels when something else sets the size: an upload limit, a template, a print size. Keep the ratio locked and set one number, and the other follows.

By percentage when you just want it smaller. Remember that percentage applies to each side, so 50% is a quarter of the pixels and roughly a quarter of the file size, not half.

Unlocking the ratio stretches the picture. It is occasionally what you want for a banner or a background, and it is obviously wrong on a face, so the lock is on by default.

Redrawing a picture onto a canvas produces a fresh file that contains the pixels and nothing else, so EXIF fields such as GPS coordinates, the camera model and the capture time are not carried over. If you are resizing a photo before posting it publicly, that is a privacy gain worth knowing about.

One EXIF field is read before it is discarded: the orientation flag. Phone cameras store the sensor image and a note about how it should be rotated, and a tool that ignores the note turns your portrait photo sideways. This one applies the rotation while decoding.

How do I resize an image to an exact width and height?

Upload it, type the width you want, and the height follows automatically while the aspect ratio lock is on. Unlock it to force both numbers, which stretches the picture. The preview and the file size update as you type, so there is nothing to press before you see the result.

Can I resize by percentage instead of pixels?

Yes. Switch to percentage and drag the slider or type a figure. 50% halves each side, which is a quarter of the pixels. Above 100% the picture is enlarged, and enlarging cannot recover detail the original never had, so it will look softer.

Which format should I pick?

JPEG for photographs, because it produces much smaller files. PNG for screenshots, logos and anything with sharp edges or transparency, because it is lossless. WebP is smaller than both at the same quality and is supported by every current browser, though some older upload forms still reject it.

Why does a large reduction still look sharp here?

Shrinking an image by more than half in a single step throws pixels away instead of averaging them, which is what makes downscaled scans and screenshots look ragged. This tool halves the image repeatedly until it is within a factor of two of the target, then does the last step, so detail is averaged down rather than dropped.

Does resizing strip the metadata from my photo?

Yes. Redrawing the picture onto a canvas produces a fresh file with only the pixel data, so EXIF fields such as GPS coordinates, the camera model and the timestamp are not carried over. The camera rotation flag is read first and applied, so a portrait phone photo does not come out sideways.

Is there a file size or a daily limit?

No. The work happens on your own device, so there is nothing for us to meter. The practical ceiling is your phone or laptop memory, and very large images simply take a moment longer to redraw.