Image Resizer
Change a picture's dimensions to exact pixels — for a website, a form, a listing or a document. Keep the proportions locked so nothing stretches.
How to resize an image
- Add your image. Its current width and height in pixels fill in automatically.
- Type the size you need. With the aspect ratio locked, change just the width and the height follows in proportion — the picture never looks squashed.
- Or use a percentage or preset. 50% halves both dimensions (and usually quarters the file size). The preset buttons set common web widths in one tap.
- Download. The result shows the exact new dimensions and file size before you save it.
Resizing and compressing are cousins, but they solve different problems. Resizing changes how many pixels a picture has; compression changes how much data each pixel takes to store. If a website asks for "800 × 800 pixels", you need resizing. If it asks for "under 200 KB", you need compression — or, often, a bit of both, which is why our Compress to KB tools shrink dimensions automatically when quality alone is not enough. Making an image bigger is possible here too, but it cannot invent detail: an enlarged photo will look soft, so always start from the largest original you have.
How to resize a photo to exact pixels
Many upload forms do not just want "a smaller photo" — they state an exact size, such as 600 × 600 or 350 × 350 pixels, and reject anything else. To hit an exact size here, add your photo, type the width the form asks for into the Width box and the height into the Height box, then download the result and check the dimensions shown before you save.
One decision matters: the aspect ratio lock. If the form's size has the same shape as your photo — a square photo for a square 600 × 600 box, for example — leave the lock on and everything stays in proportion. If the form demands a shape your photo does not have (a rectangle from a square photo, say), untick the lock to type both numbers exactly, but expect a slight stretch if the shapes differ a lot. For ID-style photos, the cleaner route is to crop the photo to roughly the right shape first, then resize — proportions stay natural and faces never look pulled.
Resizing a passport photo to the size a form asks for
Passport and visa uploads are the most common exact-pixel job. The sizes forms ask for most often are 600 × 600 pixels (the US passport and visa standard), about 413 × 531 pixels (the 35 × 45 mm size used by the UK, Schengen Europe and much of the world, at print resolution), and roughly 350 × 350 pixels on many Indian passport, exam and job portals. Set those numbers in the Width and Height boxes above and the resizer produces a photo at exactly that size.
Because each country and portal publishes its own specification — in millimetres, pixels and KB — check your form's exact numbers before you start. Our passport photo size guide lists the standard dimensions country by country, explains how the millimetre, pixel and KB figures connect, and covers the acceptance rules (background, head position, glasses) that a correctly sized photo still has to meet.
When to compress after resizing
Resizing fixes the dimensions, but the file can still be over the form's KB limit — a 600 × 600 photo saved at maximum quality can easily exceed 200 KB. If your form states both a pixel size and a maximum file size, keep the resized dimensions exactly as they are and finish the job with compression instead: the Compress Image to 50KB tool (and its 100KB and 200KB versions) lowers the file size towards the target you pick. Never fix a KB problem by shrinking the pixels below the size the form asked for — that trades a file-size rejection for a dimensions rejection. The order is always: right shape, exact pixels, then file size.