Free local photo tool · no upload
Resize Image in CM Online
This photo resizer in cm is designed for form uploads that state physical dimensions rather than only pixels. Enter the requested width and height in cm, or switch to millimeters, and the live conversion shows exactly how many output pixels the selected DPI requires.
Step 1
Choose one image
JPG, PNG and other browser-readable image formats are supported.
Stretch changes proportions. Faces, circles, signatures and text may look wider or narrower.
Crop position: 50% horizontal, 50% vertical.
Result
Download imageHow do I resize a photo to exact cm?
Choose the width and height in centimeters, select a DPI, and convert each physical measurement to pixels with px = cm ÷ 2.54 × DPI. LensUp rounds to the nearest whole pixel, then resamples the photo locally in your browser.
| Physical size | Nearest pixel size |
|---|---|
| 3.5 × 4.5 cm | 413 × 531 px |
| 6 × 2 cm | 709 × 236 px |
| 2 × 2 cm | 236 × 236 px |
An online photo resize width and height in cm task has two independent choices: physical pixel dimensions and framing. LensUp keeps those choices visible. It never silently stretches a face, signature or document to a different aspect ratio.
How to resize a photo in centimeters
- Choose one local imagePick a JPG, PNG or other browser-readable image. Processing stays on your device; there is no sign-up, upload or watermark.
- Set centimeters, millimeters and DPIUse a measured preset or enter custom dimensions. The image resize in cm calculation updates immediately with the nearest whole-pixel result.
- Choose crop or stretch, then exportCrop to fit preserves proportions and is the default. Stretch is explicit and warned because it can distort the subject. Review the output before saving.
Resize image in cm and kb as two separate constraints
A physical size and a file-size ceiling measure different things. The centimeter setting determines output pixels at the chosen DPI. The optional KB ceiling then uses the shared best-effort LensUp exporter on that already resized JPG and reports the achieved number of bytes.
A low ceiling can require lower JPEG quality or fewer pixels. Because the physical pixel dimensions are fixed first, LensUp does not pretend every cm-and-KB combination can be reached clearly. Keep required text, facial edges and signature strokes readable, and compare the result with the source.
Photo resize in cm presets and printing limits
The measured presets include 3.5 x 4.5 cm for a common passport-style form, 6cm x 2cm for an SSC-style signature field, and 2 x 2 cm. These are convenient dimensions, not acceptance rules for every authority. Always follow the current form and leave a safe content margin.
DPI is a conversion scale, not a promise of print-lab colour or extra detail. A 3.5 centimeter source enlarged to many pixels may look soft if the original was small. LensUp sets the requested pixel grid; it cannot recreate detail that the camera never captured.
Frequently asked questions
How many pixels is 3.5 x 4.5 cm at 300 DPI?
Using the nearest-pixel rule, 3.5 cm becomes 413 px and 4.5 cm becomes 531 px at 300 DPI. The live converter recalculates both values when you choose another DPI.
How do I resize image in cm 6cm x 2cm for a signature?
Choose the 6 × 2 cm preset, confirm the DPI requested by the current form, then use crop to fit so the complete signature and a small safe margin remain visible.
Should I crop or stretch when the aspect ratios differ?
Crop to fit preserves proportions but removes outer image areas; move the crop box to keep important content. Stretch keeps every pixel but changes proportions, so use it only when that distortion is acceptable.