Free Online Image Resizer

Every image has two sizes, and people mix them up all the time. The first is the dimension: how many pixels wide and tall the picture is, for example 600 × 800. The second is the file size: how much storage the file takes, for example 45 KB. They are related, but they are not the same thing, and an upload form can limit either one or both.

A resizer lets you control both. You can make the picture smaller in pixels, you can squeeze the file into a stated number of kilobytes, or you can do the two together. This page does all of that in one place, so you do not have to hop between tools.

Start with what the form says. If it asks for a number of KB or MB, use the file size box. If it asks for a width and height, use the image size boxes. If it gives both, fill in both.

• By file size. Type the limit, for example 100 KB. The tool compresses the image and, only when it has to, reduces the pixel size slightly to reach the number.
• By dimensions. Type a width, a height, or both. Leave the padlock closed to keep the original shape, or open it to set an exact width and height.
• Both together. Your pixel size stays fixed and the compression does the work. This is the usual case for exam and job forms.

Limits change from site to site and even from notice to notice, so always trust the instructions on your own form. This table is only a starting point.

Screens count in pixels, but paper and many forms speak in centimetres or inches. The link between them is DPI, which means dots (pixels) per inch. The sum is simple: pixels = inches × DPI, and one inch is 2.54 cm.

A 3.5 × 4.5 cm photo at 300 DPI works out to roughly 413 × 531 pixels. At 200 DPI it is about 276 × 354, and at 600 DPI it is about 827 × 1063. Set the DPI box to match your form, pick cm or inch from the unit list, and the tool does the arithmetic for you.

Blur comes from two places: crushing the JPEG quality and throwing away too many pixels. A good result needs a careful balance, which is why this tool tries quality first and shrinks pixels last.

• Start with a sharp original. Screenshots and chat-forwarded pictures are already compressed and have little left to give.
• Crop before you compress. Removing empty background means the pixels that remain go to the subject.
• Choose the largest limit you are allowed. If the form accepts up to 50 KB, aim for 48 to 50, not 20.
• Check the saved file. Open it at full size before you upload to be sure it still looks right.

• Stretching a picture to fit a box instead of cropping it.
• Renaming a PNG to .jpg without converting it. This tool always saves a real JPEG.
• Uploading a file that is 2 KB over the limit. Use Exactly or Under so there is no guesswork.
• Using the wrong DPI when a form gives its size in centimetres.
• Forgetting to rotate a photo that was taken sideways.

It depends on where the work happens. Many sites upload your file to a server, and you cannot tell how long it stays there. Here, every step runs inside your own browser, so the picture never leaves your device. You can confirm this by watching the network tab while you press Download. Read our Privacy Policy for the full details.