Resize Image to 51×51 mm
51 × 51 mm is how the 2 × 2 inch US passport and visa photo is written in metric. At 300 DPI it is about 602 × 602 pixels. Everything runs in your browser — nothing is uploaded. Need a smaller file instead? Compress or convert.
Drag the preview to choose which part of the image is kept. The same framing is used for every image in the batch.
Why choose 51×51 mm?
51×51 mm — that is 5.1×5.1 cm, 2.01×2.01 in — is the size asked for US passport and visa photos (2×2 inches). Saved at 300 DPI it is 602×602 pixels.
602×602 px at 300 DPI
The pixel size is worked out for you, and the file is saved with 300 DPI so it prints at exactly 51×51 mm.
An official photo size
51×51 mm is the size required for US passport and visa photos (2×2 inches). Always check the latest official rules for background and head size.
15 per A4 sheet
With small gaps, 15 photos fit on one A4 page and 15 on US Letter — handy for printing several copies at home.
1:1 square shape
The square (1:1) proportion decides the framing. Drag the preview so the subject sits where the rules expect it.
About 57 KB–110 KB as JPG
At 300 DPI a 51×51 mm photo is usually 57 KB–110 KB. If a form limits the file size, pair it with the compressor.
Same size, other units
51×51 mm equals 5.1×5.1 cm or 2.01×2.01 in. Enter whichever unit your instructions use — the result is identical.
51×51 mm at a glance
| Size | 51×51 mm = 5.1×5.1 cm, 2.01×2.01 in |
|---|---|
| Pixels at 300 DPI (print) | 602×602 |
| Pixels at 600 DPI (high quality) | 1205×1205 |
| Pixels at 200 DPI | 402×402 |
| Pixels at 150 DPI | 301×301 |
| Aspect ratio | square (1:1) |
| Copies per A4 sheet | 15 |
| Copies per US Letter sheet | 15 |
| Copies per 4×6 in photo paper | 2 |
| Typical JPG at 300 DPI | 57 KB–110 KB |
| Same and similar sizes | 2×2 in, 5.08×5.08 cm, 50.8×50.8 mm, 50×50 mm |
Resize a photo to 51×51 mm in 3 steps
- Add your photo — a clear, well-lit original works best.
- The size is already set to 51×51 mm at 300 DPI. Drag and zoom the preview to frame the face or subject.
- Click Resize and download. Print it at 100% (“actual size”) so it comes out at 51×51 mm.
New to image resizing? Read the full resizing guide.
Square sizes
Same width and height — profile photos, icons, product shots:
Landscape sizes
Wider than tall — screens, banners, covers and thumbnails:
Portrait sizes
Taller than wide — passport photos, forms and phone screens:
Change the aspect ratio
Paper, print & photo sizes
Paper and photo sizes in mm, cm and inches, plus DPI tools:
Resize for a platform
Ready-made sizes for social profiles and posts:
Resize tools
Batch resizing, DPI and crop tools:
51 mm, 2 inches and 600 pixels
2 inches is 50.8 mm; forms round it to 51. At 300 DPI, 51 mm works out to 602 × 602 pixels, while exactly 2 inches is 600 × 600. Both print as a 2-inch square.
For the US digital photo upload, the State Department accepts square images within a pixel range (at least 600×600). Check the current requirements before submitting.
Head size matters more than file size. US rules ask for the head to be roughly 25–35 mm from chin to crown. Drag the preview so the head fills about half to two-thirds of the height.
Prefer exact inches? Use the 2×2 inch page. Metric neighbour: 50×50 mm.
Similar print and photo sizes
Nearby print sizes, saved at 300 DPI so they print at the right size:
Frequently asked questions
What size is a US passport photo in mm?
2×2 inches, which is 50.8×50.8 mm and usually written as 51×51 mm.
How many photos of 51×51 mm fit on an A4 page?
About 15 on A4 and 15 on US Letter, leaving 5 mm margins and 3 mm between photos. On 4×6 inch photo paper you can fit 2.
What DPI should a 51×51 mm photo be?
300 DPI is the standard for photo prints and gives 602×602 pixels. Some offices accept 200 DPI (402×402); 600 DPI (1205×1205) is only needed for very high-quality printing.
What is 51×51 mm in other units?
51×51 mm is 5.1×5.1 cm, 2.01×2.01 in. Close sizes that are often confused with it: 2×2 in, 5.08×5.08 cm.
Why does my 51×51 mm print come out the wrong size?
Most printers scale images to “fit page” by default. Choose “actual size” or 100% in the print dialog, and the photo will print at exactly 51×51 mm.
How large is a 51×51 mm photo file?
Usually 57 KB–110 KB as a JPG at 300 DPI. If an online form allows less, reduce it with the compressor — the print size stays the same.
Are my images uploaded?
No. Resizing happens entirely in your browser. Nothing is transmitted or stored, and you can disconnect from the internet after the page loads and it still works.