Resize Image in Millimetres (mm)
Scale any image in millimetres, calculated at 300 DPI. Keep this handy: 10 mm lands at roughly 118 px at 300 DPI, so drop those pixel values into the resizer.
Open Resize Image in mm →DPI reference — how mm maps to pixels
Files are measured in pixels, which means a figure in millimetres is only nailed down after you set a DPI. The values people reach for most are shown here.
| DPI | Best for | 1 inch | 1 cm | 1 mm |
|---|---|---|---|---|
| 72 DPI | Web / on-screen display | 72 px | ≈ 28 px | ≈ 2.8 px |
| 150 DPI | Minimum print quality | 150 px | ≈ 59 px | ≈ 5.9 px |
| 300 DPI | Standard print (ID cards, photos) | 300 px | ≈ 118 px | ≈ 11.8 px |
| 600 DPI | High-quality print / scanning | 600 px | ≈ 236 px | ≈ 23.6 px |
Taken at 300 DPI: 1 inch = 300 px · 1 cm ≈ 118 px · 1 mm ≈ 11.8 px. This page's preset starts at 413×531 px, saves JPG, and aims for 0–500 KB.
How to resize an image in mm — step by step
About resizing images in mm
Feed it a measurement in millimetres and it handles the resize at 300 DPI. Keep one figure in mind — 10 mm comes to about 118 px at 300 DPI — then type the matching pixels in. It slots in wherever you need it: readying paperwork for an exam form, prepping a photo for print, or matching a picture to one precise size on a project, all finished in your browser in a heartbeat.
There is nothing to install and nothing to send off; the image stays on your device from start to finish.