Resize image (px, cm, mm, inches)
Type the size your form asks for, in pixels or in cm, mm or inches with a DPI. The output has exactly those pixels, and the DPI is written into the file.
JPG, PNG, WebP or HEIC, up to 25 MB
Processed on your device. Never uploaded.
Settings
The other side follows so the picture is not stretched.
Written into the file. Leave 200 if your notice gives none.
Leave empty for no limit.
About this tool and size
Pixels, centimetres and DPI
Many notices give sizes in centimetres: SSC wants a 6.0 × 2.0 cm signature, CTET a 3.5 × 4.5 cm photo, UPPSC a 5 × 6 cm photo. A screen image has no centimetres, only pixels, so the size is converted with the DPI: pixels = cm ÷ 2.54 × DPI. When the notice gives no DPI, 200 DPI is the safe choice that most portals expect.
We resize with a high-quality Lanczos filter, so edges and text stay crisp, and save JPGs as baseline (not progressive), which older government portals require.
When to use a different tool
If your form fixes the pixels and a KB range together, the Custom size tool or your exam’s kit handles both in one step. For signatures, the Signature resize tool also cleans the paper to white.
How to use it
- Add your image. Take a photo or choose one from your gallery. HEIC photos from iPhones work too.
- Enter the size. Choose a unit, then type the width and height. With the lock on, the other side follows so the picture never looks stretched.
- Set DPI, format and KB. Physical sizes need a DPI, usually 200 for exam forms. Pick JPG or PNG and, if your form has one, a maximum KB.
- Download. Check that width × height and size show ticks, then download.
Questions
How many pixels is 3.5 × 4.5 cm?
At 200 DPI it is about 276 × 354 px; at 300 DPI it is 413 × 531 px. Pick cm as the unit, type 3.5 and 4.5 and set the DPI, and the tool shows the pixels.
What does the aspect lock do?
With the lock on, changing the width updates the height in the same proportion as your picture, so faces are not squashed. Turn it off to set both sides freely; the picture is then stretched to fit.
Does DPI change the quality?
No. DPI only says how big the picture should print. It matters when a notice gives the size in cm or inches, because the pixel count is worked out from it. We also write it into the JPG header, which some portals check.
Can I make a small photo bigger?
Yes, but a picture enlarged beyond its original pixels looks soft. The tool warns you when that happens.
Is anything uploaded?
No. Resizing runs in your browser and the page works offline after your first visit.