Resize Images
Your files stay on this device. Nothing is uploaded, nothing is stored on a server.
Drop your files here
or pick them from your device
How it works
- Drop your images onto the bench, or pick them from your device.
- Either set a percentage, or type the width or height you need in pixels.
- Press Resize, then download the results one at a time or as a .zip.
Resizing changes how many pixels an image is made of. That sounds obvious, but it is the source of most confusion about images, because three different things all get called "size": the pixel dimensions, the file size in megabytes, and the physical size something prints at. Changing the pixel dimensions is the only one you control here — and it is also the most effective way to reduce the other two.
The relationship is not linear, and that surprises people. Halving both the width and the height leaves you with a quarter of the pixels, and the file usually shrinks by roughly that much too. Going from a 4000-pixel-wide camera photo to 1600 pixels — plenty for any web page — typically takes a 4 MB file down to a few hundred kilobytes. If your goal is a smaller file, resizing almost always beats compressing harder, and it looks better while doing it.
Going the other way does not work the same. You can enter a larger number and the image will come back larger, but the extra pixels are invented by averaging the ones already there. Detail that was not captured cannot be restored; a small blurry photo enlarged four times is a large blurry photo. Enlarge only when something requires a minimum pixel count, and do not expect it to look sharper.
As for printing: there is no DPI setting here and there does not need to be. DPI is a number stored alongside the image that tells a printer how big to lay it out. It does not affect what the image contains. What matters for print is how many pixels you have.
Questions people ask
- Will resizing make the file smaller?
- Yes, and usually dramatically. Fewer pixels means less to store. Halving the width and height removes three quarters of the pixels, and the file size typically falls by a similar proportion.
- Can I make an image bigger?
- You can, but it will not gain any detail. The new pixels are calculated from the ones that already exist, so an enlarged photo looks softer, not sharper. Enlarge only when a minimum pixel count is required.
- What width should I use for a website?
- For a full-width banner, 1600 to 2000 pixels covers most screens. For an image sitting inside an article, 800 to 1200 is usually plenty. Anything wider is downloaded and then thrown away by the browser.
- How do I keep the proportions?
- Leave the checkbox ticked and fill in only one side — the other is worked out from the original shape. If you fill in both with the box ticked, the image is scaled to fit inside those dimensions rather than stretched to match them.
- Does this change the DPI for printing?
- No, and it does not need to. DPI is only a label telling a printer how large to place the image. The thing that actually determines print quality is the pixel count, which is exactly what you are setting here.
- Do my images leave the device?
- No. The resizing is done by your browser on this page. There is no upload and no server copy.