Set an exact width and height in pixels, centimetres or inches. Lock the ratio so nothing stretches, and optionally cap the file size at the same time.
This changes how many pixels the image contains — a genuinely different operation from compressing it. If your form complained about kilobytes, you want reduce image size in KB instead.
Common pixel sizes people need
| Size | Used for |
|---|---|
| 413 × 531 px | Passport photo, 3.5 × 4.5 cm at 300 DPI |
| 240 × 320 px | GATE and several engineering portals |
| 200 × 230 px | Older state exam portals |
| 140 × 60 px | Signature strip, dedicated preset |
| 250 × 80 px | GATE signature |
| 600 × 600 px | US passport photo and many profile uploads |
How the resampling works
Shrinking an image in one jump aliases badly — thin lines break up and text goes crunchy. This tool steps the image down by halves first and only makes the final adjustment at the target size, which is the same approach image editors use. The result is noticeably cleaner on large reductions.
Enlarging beyond the original pixel count is possible but rarely useful. You cannot invent detail that was never captured; you only get a softer version of the same picture. If a form demands larger dimensions than your photo has, re-shoot it rather than upscaling.
Centimetres, inches and DPI
Pixels have no physical size until you fix a resolution. A form asking for 3.5 × 4.5 cm is really asking for a pixel count at an assumed DPI. At the 96 DPI browsers use, that is 132 × 170 px; at the 300 DPI print standard, 413 × 531 px. When a portal gives you centimetres and nothing else, the safer choice is the larger figure — an oversized image gets accepted and downscaled far more often than an undersized one gets accepted at all.
Frequently asked questions
How do I resize an image to exact pixels?
Upload the image, type the width and height you need, and download. Keep the aspect ratio checkbox on if you do not want the picture stretched, and the second dimension updates automatically.
What is the difference between resizing pixels and reducing KB?
Pixels are how much picture there is; kilobytes are how much disk it occupies. You can have a huge 4000-pixel image at 50KB, and a tiny 200-pixel one at 2MB. Forms check them separately, so read the error message before choosing a tool.
Will resizing distort my photo?
Not if you keep the aspect ratio locked. Unlocking it lets you type any width and height, which squashes or stretches the image — occasionally what a form demands, but usually a mistake.
Can I resize in centimetres?
Yes. Switch the unit dropdown to centimetres or inches and the tool converts to pixels for you at 96 DPI, which is what browsers and most web forms assume.