Resize Image in Millimeters (mm)
Crop and prepare your photos for perfect physical printing by entering exact millimeter measurements.
Upload Your Photo
Drag and drop here, or choose from your device
Choose FileSet Custom Millimeters
Drag the crop box to frame your picture exactly how you want it to print.
Print Dimensions
Output Pixels: 413 x 531 px
How to Use Resize Image in Millimetres
Type the width and height in millimetres — the tool works out the pixels for your DPI and crops the photo to that exact shape.
Upload Your Photo
Choose the picture you want to resize.
Type Width & Height in mm
Enter the size (for example 35 × 45 mm) and choose a DPI — 300 for printing.
Crop & Download
Frame the photo and download a JPG with the DPI saved inside.
Unit
Millimetres
Example
35 × 45 mm → 413 × 531 px
DPI
300 · 150 · 96 · 72
DPI in file
Yes
Privacy
Stays on your device
Price
100% free
Resize Image in Millimetres: Size Rules at a Glance
The sizes this tool makes, in plain numbers.
| Rule of thumb | 1 mm ≈ 11.8 px at 300 DPI |
|---|---|
| Example | 35 × 45 mm at 300 DPI = 413 × 531 px |
| For printing | 300 DPI |
| For screens | 96 or 72 DPI |
What Can You Use It For?
Popular ways people use Resize Image in Millimetres.
Exact Print Sizes
Print a photo at an exact size in millimetres.
Forms & ID Photos
Make a photo the size a form asks for.
Frames & Albums
Fit a photo to a frame or album slot.
Craft & Stickers
Make pictures for labels, cards and crafts.
Tips for a Perfect Result
- Use 300 DPI for printing — it gives sharp results.
- Double-check the unit: 35 × 45 mm is not the same in other units.
- If your form gives pixels instead, use Image Resizer.
Frequently Asked Questions
Quick answers about Resize Image in Millimetres.
Pixels = size in inches × DPI. 1 mm ≈ 11.8 px at 300 DPI. The tool does the maths for you.
300 DPI for printing; 96 or 72 for screens.
Yes — the DPI you choose is saved inside the file.
No. It's cropped to the shape you typed, not stretched.
413 × 531 px at 300 DPI.
Yes. It stays on your device.
Yes — Resize in cm or Resize in Inches.
Yes.
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