MM to Pixels Converter (300 DPI & Custom DPI)
Convert any millimeter width and height (such as 35 × 45 mm, 33 × 48 mm, or 210 × 297 mm A4) to exact integer pixels across 72–600 DPI, then resize your photo in one click.
413 × 531 px
0.22 MP @ 300 DPI
3.5 × 4.5 cm
1 cm = 118.11 px
35 × 45 mm
1 mm = 11.81 px
1.38 × 1.77 in
1 in = 300 px
Formula: px = round((cm ÷ 2.54) × 300) → 3.5 × 4.5 cm = 413 × 531 px
Supports JPG, PNG, HEIC, WEBP, PDF, SVG, TIFF, AVIF, GIF, BMP
No files selected yet. Drag & drop photos, documents or click browse above.
Millimeters to Pixels Conversion Table (72, 150, 200 & 300 DPI)
Pre-calculated pixel counts for common ISO paper and biometric sizes:
| Size in MM | At 72 DPI (Web) | At 200 DPI (Portal) | At 300 DPI (Print) |
|---|---|---|---|
| 25 × 35 mm (PAN / Stamp) | 71 × 99 px | 197 × 276 px | 295 × 413 px |
| 35 × 45 mm (ICAO Passport) | 99 × 128 px | 276 × 354 px | 413 × 531 px |
| 50 × 70 mm (Canada Visa) | 142 × 198 px | 394 × 551 px | 591 × 827 px |
| 148 × 210 mm (ISO A5) | 420 × 595 px | 1165 × 1654 px | 1748 × 2480 px |
| 210 × 297 mm (ISO A4) | 595 × 842 px | 1654 × 2339 px | 2480 × 3508 px |
From Calculator Readout Straight Into Pixel-Accurate Resizing
Use the interactive MM → Pixels calculator above to test any custom millimeter dimension and DPI, copy the pixel output in one click, or press the "Resize Photo" button to push those exact measurements directly into the studio below.
Every resized file receives both the calculated integer pixel dimensions and the matching JFIF/pHYs DPI header, ensuring Illustrator, InDesign, Acrobat, and government upload portals agree 100% on your millimeter size.
1-Click Studio Sync
Sending calculator values updates Stage 2 width, height, and DPI automatically.
Supports Any Custom DPI
Switch between 72, 96, 150, 200, 300, 600 DPI or type any custom scanner DPI up to 2400.
100% Private Local Tool
All math and image resampling execute locally in your browser.
Related Presets, Calculators & Companion Studios
Jump directly to a pre-configured studio with exact settings locked in:
Convert pixel dimensions into millimeters.
Resize photos directly in millimeters.
Centimeter to pixel converter and resizer.
Convert inches to pixels at 300 DPI.
One-click 35×45 mm passport photo resizer.
Set lossless 300 DPI metadata on any photo.